Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Water Based: Environmentally and user safe. No solvent clean-up or disposal problems.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.

Application Procedures

Surface Preparation
Surfaces to receive M60 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion.  Remove all loose or friable mortar before application of Jahn M60.  The sides of the repair area should be "square cut" with edges and a minimum of 1/4" depth.  Wash the prepared surface with clean water and a bristle brush.  All necessary joint repairs should be completed with Jahn M110 Pointing Mortar 21 days prior to the application of Jahn M60.

Mixing
The mixing ratio is approximately 4 parts powder to 1 part water by volume, depending on temperature and humidity.   (This ratio can be altered as needed to suit local conditions.)  Small quantities may be mixed manually, stirring until the plaster is thoroughly mixed.  Large quantities should be mixed for a minimum of five minutes using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle.  The more thoroughly mixed the material becomes, the easier it is to apply and the better the quality of the finished product. The working time will vary, depending upon wind, temperature, and humidity.
Using excessive water in the mixture may affect the color of the repair.

Bulk mixing may be done in a mortar mixer, paying strict attention to proper quantities of water and material used.

Application
(Substrates require intensive presoaking prior to application of Jahn M60.) Thoroughly presoak until saturated (Saturated Surface Dry or SSD). This prevents the stucco from drying too quickly. If the surface is allowed to dry out before applying M60, this step must be repeated. This is critical. It is our recommendation that only experienced stucco or plastering contractors, or trained Jahn Stucco applicators use this material. Without knowledge of sufficient substrate saturation, the substrate might draw the moisture out of the Jahn M60 too quickly, and bond will not be achieved.

The material can be applied in one application or successive lifts if desired. If applying Jahn M60 in lifts, additional surface preparation is required to maintain adhesion between lifts. Scratch or brush the surface of the initial coat to remove the cement skin formed during troweling. This will open the pores before an additional layer of material is applied. Then scratch again with a plasterer's comb to create more surface area for mechanical bonding. Apply the second coat 48 to 72 hours later, making sure the surface is properly presoaked. The waiting period before finishing will vary, depending on wind, temperature and humidity.

After initial set up, while the plaster is still workable, wipe the surface with a dry sponge in order to prevent surface map cracking of the material. Never use a damp sponge for final finishing.

Curing
Periodically mist M60 repairs with clean water for at least a 72-hour period. The timing for initial misting will vary with ambient conditions. Hot, dry conditions may require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Clean Up
Remove uncured material from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry). Cured plaster may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn M60 to a frozen or exceedingly hot substrate. The applied M60 must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn M60 or use them as surface preparation materials.

Minimum thickness of M60 application is 1/4".

Packaging and Coverage
A 5 gallon plastic pail contains approximately 33 lb. of material. This will cover 0.5 cubic feet (12 sq. feet at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is six months in original, unopened packaging.

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Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Certified Installers: Only installers with certification from Cathedral Stone Products can purchase Jahn M70 Limestone and Sandstone Repair Mortars

Application Procedures

Surface Preparation
Surfaces to receive M70 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated masonry from the repair area using manual or pneumatic cutting tools. The area to be repaired should be cut to provide a minimum of 1/4" depth. Do not install repairs that have a feathered edge (see diagram below), incorrect installation will cause repairs to fail prematurely. Wash the prepared surface with clean water and a bristle brush to remove dust from the pores.

Mixing
The mixing ratio is approximately 5 to 5 1/2 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. The mortar should be the consistency of damp sand. M70 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity. Using excessive water in the mixture may affect the color of the repair.

Application
Moisten the substrate using clean water. Jahn Mortar should be applied to a glistening wet surface on vertical applications and a well dampened surface (with no pooling water) on horizontal applications. If the surface is allowed to dry out before applying M70, this step must be repeated. This is very important.

The next step of the application is what CSP has termed the "Peanut Butter" coat. The Jahn mortar should be mixed with water to the consistency of wet putty. Apply the "Peanut Butter" coat to the glistening wet substrate approximately 1/8 inch thick. Important - To achieve proper bond, the "Peanut Butter" coat must not dry out prior to application of Jahn Mortar (5:1) mix!

Build the material out beyond the surface of the original stone. After achieving initial set, scrape away excess mortar until the desired profile is reached. The waiting period for scraping should be determined on the job, due to the effects of heat, humidity, and wind on the final color. This is characteristic of all mortars, and should be determined through samples applied on site. In hot weather the darker colors may require scraping within a short time, while in cold weather the wait time may be several hours.

For the best result, wait until the Jahn Mortar is the consistency of dry sand before screeding and does not stick to the screeding tool. To achieve a rougher texture, wait longer before finishing. M70 repairs should not be floated or heavily troweled to achieve the finish, since this can alter the texture, porosity, and color of the material.

Where necessary, anchor using threaded stainless steel dowels (or other acceptable anchors). It is normally not recommended to build an armature within the repair using tying wire (or other material), or to use wire lath.

Curing
Periodically mist M70 repairs using clean water for at least a 72 hour period. The timing for initial water misting will vary with ambient conditions. Hot, dry conditions may require misting within 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Clean Up
Remove uncured mortar from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry).

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to a frozen or exceedingly hot sub-strate. The applied mortar must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials

Minimum thickness of mortar application is 1/4".

Packaging and Coverage
A 5 gal. plastic pail contains approx. 44 lb. of material. This will cover 0.5 cu. ft. (12 sq. ft. at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is six months in original, unopened packaging.

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Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Factory Controlled: No field chemistry resulting in product variation.
• Highly Resistant to Carbonation: Superior long-term, reinforcing steel protection.

Application Procedures

Surface Preparation
All holes to be filled with M80 must be free of all dust, dirt, grease, oil, laitance or any loose material which could prevent proper adhesion. Clean dust out of holes prior to application.

All anchors must be free of rust. Treat anchors with protective coating to prevent rusting. Apply mortar only after coating is completely dry.

Mixing
The mixing ratio is approximately 5 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. Mix manually. Normal mixing time is approximately five minutes, or until a lump-free consistency is achieved. The working time will vary, depending upon wind, temperature and humidity.

Bulk mixing may be done in a mortar mixer, paying strict attention to proper quantities of water and material used.

Setting Anchors
Moisten the drill holes using clean water prior to applying M80. If the holes are allowed to dry out, this step must be repeated. This is important. Pour the mortar into the drill hole so that it is approximately half full. Insert anchor and tap it several times in order to remove any voids or air pockets. Fill the remainder of the cavity with mortar. Anchor should be able to withstand a full load in approximately two days.

Curing
Periodically mist M80 using clean water. The timing for initial misting will vary with ambient conditions. Hot, dry conditions will require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to a frozen or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials.

Minimum thickness of M60 application is 1/4".

Packaging and Coverage
A 5 gallon plastic pail contains approximately 44 lb. of material. Mortar color is cement gray. This will cover 0.5 cu. ft. (12 sq. feet at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is six months in original, unopened packaging.

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Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vpor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Single Layer Build-Up: Faster application and reduced installation costs.
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Highly Resistant to Carbonation: Superior long-term, reinforcing steel protection.

Application Procedures

Surface Preparation
Surfaces to receive Jahn Mortar must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated concrete from the repair area (minimum depth 1/4") using manual or pneumatic cutting techniques or mechanical abrasion such as sandblasting, water blasting, shotblasting or chipping. The sides of the repair area should be square cut, incorrect installation will cause repairs to fail prematurely. Wash the prepared surface with clean water and a bristle brush to remove dust from the pores.

Treatment of Reinforcing Steel
Cut out and replace all reinforcements whose structural integrity is in question, as directed by the Project Engineer. Structurally sound corroded reinforcing steel must be mechanically abraded to a white metal finish. Mechanical means, such as sandblasting, grinding or wire brushing are acceptable. Treat anchors with a protective coating to prevent rusting. Apply repair mortar only after coating is completely dry.

Mixing
The mixing ratio is approximately 5 to 5 1/2 parts powder to 1 part water by volume, depending on temperature and humidity. Continue mixing until the mortar is thoroughly mixed and is the approximate consistency of damp sand.

M90 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. Bulk mixing may be achieved in a mortar-type mixer. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity.

Application
Moisten the substrate using clean water. Jahn Mortar should be applied to a glistening wet surface on vertical applications and to a dampened surface on horizontal applications (with no pooling water). If the surface is allowed to dry out before applying M90, this step must be repeated. This is important.

The next step of the application is what CSP has termed the "Peanut Butter" coat. The Jahn mortar should be mixed with water to the consistency of wet putty. Apply the "Peanut Butter" coat to the glistening wet substrate approximately 1/8 inch thick. Important - To achieve proper bond, the "Peanut Butter" coat must not dry out prior to application of Jahn Mortar (5:1) mix!

When repairing horizontal surfaces using M90 HG, apply material flush to the surface and finish to a tight steel trowelled finish, float, or broom to achieve a textured effect. When repairing vertical surfaces using M90 VG, build up material beyond the surface of the substrate. The waiting period before finishing will vary, depending upon wind, temperature, and humidity. After achieving initial set, scrape away excess mortar until the desired profile is reached.

M90 may be placed in deep applications using successive lifts. If a cement skin forms between applications (the surface will appear glossy), scrape away enough of the surface to remove the skin (about 1/16" of material). This will open the pores before an additional layer of material is applied. The surface should be moistened again before continuing the application.

Curing
Periodically mist M90 repairs using clean water for at least a 72 hour period. The timing for initial misting will vary with ambient conditions. Hot, dry conditions may require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Clean Up
Remove uncured mortar from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry). Cured mortar may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to a frozen or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials.

Minimum thickness of mortar application is 1/4"

Packaging and Coverage
A 5 gal. plastic pail contains approx. 44 lb. of material. This will cover 0.5 cu. ft. (12 sq. ft. at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is six months in original, unopened packaging.

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Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Certified Installers: Only installers with certification from Cathedral Stone Products can purchase Jahn M100 Marble Repair Mortar.

Application Procedures

Surface Preparation
Surfaces to receive M100 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated masonry from the repair area using manual or pneumatic cutting tools. Areas to be repaired should be cut to provide a minimum of 1/4" depth. Do not install repairs that have a feathered edge (see diagram below), incorrect installation will cause repairs to fail prematurely. Wash the prepared surface with clean water and a bristle brush to remove dust from the pores.

Mixing
The mixing ratio is approximately 4 1/2 to 5 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. The mortar should be the consistency of a stiff putty, without lumps. M100 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity. Using excessive water in the mixture may affect the color of the repair.

Application
Moisten the substrate using clean water. Jahn Mortar should be applied to a glistening wet surface on vertical applications and a well dampened surface (with no pooling water) on horizontal applications. If the surface is allowed to dry out before applying M100, this step must be repeated. This is very important.

The next step of the application is what CSP has termed the "Peanut Butter" coat. The Jahn mortar should be mixed with water to the consistency of wet putty. Apply the "Peanut Butter" coat to the glistening wet substrate approximately 1/8 inch thick. Important - To achieve proper bond, the "Peanut Butter" coat must not dry out prior to application of Jahn Mortar (4.5:1) mix!

Since the working consistency of M100 is somewhat wet, large repairs may require successive applications in order to avoid material slump. If this is necessary, be sure to remove the shiny cement skin that sometimes forms on the surface by scraping away 1/16" of material. This will open the pores before an additional layer of material is applied. Dampen surface and continue application.

Build up material beyond the surface of the substrate. The waiting period before finishing will vary, depending upon wind, temperature, and humidity. After achieving initial set, scrape away excess mortar until the desired profile is reached.

To simulate the original terra cotta glaze, TerraCoat Glaze Repair Satin or High Gloss can be applied once repairs are completely cured (28 days).

Curing
Periodically mist M100 repairs using clean water for at least a 72 hour period. The timing for initial misting will vary with ambient conditions. Hot, dry conditions may require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Clean Up
Remove uncured mortar from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry). Cured mortar may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to a frozen or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials.

Minimum thickness of mortar application is 1/4"

Packaging and Coverage
A 5 gallon plastic pail contains approx. 44 lb. of material. This will cover 0.5 cubic ft. (12 sq. ft. at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is 6 months in original, unopened packaging.

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Product Highlights

• Not affected by salts
• No Shrinkage!
• Factory Controlled: No field chemistry resulting in product variation.
• Individually Formulated Mixes: Specific formulas for the restoration of limestone, sandstone and brick mortar joints and can be adjusted for specific requirements.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.

Application Procedures

Surface Preparation
Joints to receive M110 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated mortar. The minimum depth of mortar application is 1/4". Rinse joints with clean water.

Mixing
The mixing ratio is approximately 4 1/2 to 5 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity. Using excessive water in the mix may affect the color of the repair.

Pointing
Moisten the joint using clean water. If the surface is allowed to dry out before applying M110, this step must be repeated. This is very important. The mortar should be applied using appropriate pointing tools. Place the mortar into the joint so that it matches the original joint profile.

Curing
Periodically mist M110 joints using clean water for at least a 72 hour period. The timing for initial water misting will vary with ambient conditions. Hot, dry conditions may require misting within 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques. Do not use water or solvents immediately after application to wash off excess mortar.

Clean Up
Remove uncured mortar from the perimeter of the joint before it dries using clean water and a rubber sponge or a dry brush. Cured mortar may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to a frozen or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials.

Minimum thickness of mortar application is 1/4".

Packaging and Coverage
A 5 gallon plastic pail contains approx. 44 lb. of material. This will cover 288 linear feet (1/4" joint at 1" depth).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40°F to 90° F with low to average humidity. Average shelf life is 6 months in original, unopened packaging.

Back to Top

Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Certified Installers: Only installers with certification from Cathedral Stone Products can purchase Jahn M120 Limestone and Sandstone Repair Mortars

Application Procedures

Surface Preparation
Surfaces to receive M120 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated masonry from the repair area using manual or pneumatic cutting tools. The area to be repaired should be cut to provide a minimum of 1/4" depth. Do not install repairs that have a feathered edge (see diagram in the next column), incorrect installation will cause repairs to fail prematurely. Wash the prepared surface with clean water and a bristle brush to remove dust from the pores.

Mixing
The mixing ratio is approximately 4 1/2 - 5 parts powder to 1 part water by volume (or until material is easy to spread), depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. The mortar should be the consistency of damp sand. M120 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity. Using excessive water in the mixture may affect the color of the repair.

Application
Moisten the substrate using clean water. Jahn Mortar should be applied to a glistening wet surface on vertical applications and a well dampened surface (with no pooling water) on horizontal applications. If the surface is allowed to dry out before applying M120, this step must be repeated. This is very important.

The next step of the application is what CSP has termed the "Peanut Butter" coat. The Jahn mortar should be mixed with water to the consistency of wet putty. Apply the "Peanut Butter" coat to the glistening wet substrate approximately 1/8 inch thick. Important - To achieve proper bond, the "Peanut Butter" coat must not dry out prior to application of Jahn Mortar (4.5:1) mix!

Since the working consistency of M120 is somewhat wet, large repairs may require successive applications in order to avoid material slump. If this is necessary, be sure to remove the shiny cement skin that sometimes forms on the surface by scraping away 1/16" of material. This will open the pores before an additional layer of material is applied.

Build up material beyond the surface of the original stone. The waiting period before finishing will vary, depending upon wind, temperature, and humidity. After achieving initial set, scrape away excess mortar until the desired profile is reached.

Curing
Periodically mist M120 repairs using clean water for at least a 72 hour period. The timing for initial misting will vary with ambient conditions. Hot, dry conditions may require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Clean Up
Remove uncured mortar from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry). Cured mortar may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
Do not apply Jahn Mortar to frozen or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 408 F to 908 F with low to average humidity.

Do not add bonding agents to Jahn Mortar or use them as surface preparation materials.

Minimum thickness of mortar application is 1/4".

Packaging and Coverage
A 5 gallon plastic pail contains approximately 44 lb. of material. This will cover 0.5 cubic feet (12 square feet at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40°F to 90° F with low to average humidity. Average shelf life is 6 months in original, unopened packaging.

Back to Top

Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Contains No Latex or Acrylic Additives
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Dry Pack System: Stronger, denser castings eliminate air voids and produce higher quality reproductions.
• Highly Resistant to Carbonation: Superior long-term, reinforcing steel protection.

Casting Procedures

Preparation
Prior to packing the mold, a non-staining mold release should be applied to all surfaces, making sure to treat undercut areas well.

Mixing
The mixing ratio is approximately 9 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. The mortar should be the consistency of damp sand. M150 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity.

Casting
Clean the mold of all foreign material which could cause imperfections. Coat the mold with a non-staining release agent. Scoop approximately 1/3 of the mixed mortar into the mold and tamp it firmly. Press the initial application into place by hand, making certain to completely fill intricate detailing and undercut areas. As the build-up of material proceeds, tamp mortar repeatedly to consolidate. Compaction may be performed using wood tamp and a mallet. Proper compaction is essential for sharp edges. Repeat the process until the mold is slightly overfilled.

Once filled and firmly compacted, screed excess material. This should produce a flush surface with the top of the mold. Cover casting with plastic sheeting for approximately 24 hours.

Curing
After the initial 12-24 hours has elapsed, uncover the mold and pour clean potable water into the cast until the point of rejection. Recover mold with the plastic. Remove cast from the mold after an additional 24 hours have passed.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Packaging and Coverage
A 5 gallon plastic pail contains approximately 44 lb. of material. This will produce 0.5 cubic feet of casting mortar.

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is 6 months in original, unopened packaging.

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Product Highlights

• Single-Component: Mixes with water only, improving quality control and consistency of application.
• Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
• Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
• Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
• Factory Controlled: No field chemistry resulting in product variation.
• Custom Colored Upon Request: Closely matches existing masonry. Choose from Standard or Custom Colors.
• Certified Installers: Only installers with certification from Cathedral Stone Products can purchase Jahn M160 Granite and Bluestone Repair Mortar.

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Application Procedure

Surface Preparation
Surfaces to receive Silin stucco must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated masonry from the repair area using manual or pneumatic cutting tools. Dampen all masonry surfaces with water. For non-absorptive surfaces dampening is not required (i.e. rigid insulation). For applications on non-masonry surfaces, plastic trim (corner bead, j-channel, etc.) needs to be installed.

Mixing
It is recommended that a dust mask be worn during mixing. The mixing ratio is approximately 2 - 2¼ gallons of water per bag (30kg), depending on temperature and humidity. More water may be required as ambient temperature rises. Mix thoroughly by means of mechanical mixer, let stand for approximately 10 minutes, and then remix to the desired consistency. The mortar is workable for approximately 1-2 hours, depending on wind, temperature and humidity. Although not recommended, the mortar can be re-tempered (water added and remixed). Do not mix any cured material with water for reuse.

Application
When applying the SILIN® “A & A” Reinforcing and Leveling Mortar over porous masonry dampen the surface prior to application using clean potable water. Protect other coatings, glass and metal parts, etc. prior to application. Do not apply below 40 F. Apply the Silin mortar with a trowel or mechanical pump in 3/16” to 1/2” layers and trowel to a smooth finish. For uneven substrates, fill the deeper voids to even the substrate. Allow the mortar to dry and then apply a finish coat. If applying Silin stucco in lifts, additional surface preparation is required to maintain adhesion between layers. Scratch or brush and comb the surface of the initial coat to remove the cement skin formed during troweling. This will open the pores before an additional layer of material is applied. Then scratch again with a plasterer’s comb to create more surface area for mechanical bonding. The second coat can be applied after the initial coat has achieved thumbprint hardness (Follow initial dampening procedures if the first coat has dried). For substrates where the SILIN® “A & A” Reinforcing Fabric is required, apply a layer of SILIN® “A & A” Reinforcing and Leveling Mortar approximately 1/8” to 1/4:” thick. Embed the fiber mesh into the mortar overlapping the mesh by 6 inches on each edge. Trowel fiber mesh into mortar. Apply another 1/8” to 1/4” of mortar to finish the application and trowel to a smooth finish. For substrates requiring the use of wire lathe (plywood), two applications are required. The first application should be troweled into the lathe. The finish application should be applied the following day.

Finishing
The waiting period before finishing will vary, depending on wind, temperature and humidity. After initial set, finish the surface with a wet sponge/float or wooden float. Final texture will vary depending on the float chosen for finishing. Install faux joints, block lines, or historic tooling immediately after finishing before the stucco hardens. Clean any residue from the surrounding area with a sponge and clean water. This should be done before the mortar sets. Lightly mist the repair with water to wet the entire surface of the finished repair approximately 30 minutes to 1 hour after completion on hot sunny days, and approximately 2 hours or longer, on cool or cloudy days. Time will vary with temperature and humidity.

Curing
Lightly mist several times a day on the three days following the repair installation. Should access to the repairs be impossible for a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques.

Coverage rate
The SILIN® “A & A” Reinforcing and Leveling Mortar will cover approximately 108 sq. ft. at 1/16” thick, 54 sq. ft. at 1/8” to 3/16” thick, or 30 sq. ft. at 1/4” thick, per bag (30kg).

Container Size
The material is delivered in 30 kg (66 lb.) bags.

Tools
Place tools in clean water during breaks. Clean thoroughly with clean water after use. Cured SILIN® “A & A” Reinforcing and Leveling Mortar is insoluble in water.

Storage
Cool and dry. Close containers airtight after use. Do not place bags on concrete floors without pallets. Use up within 12 months.

All the information in this technical data sheet is based on extensive practical experience. We assume full warranty for the quality of the delivered material. The information above is of an advisory nature and in no way binding. The user is fully responsible for the observation of existing regulations and conditions when using the product. Consultation with our regional managers does not establish a consultancy relationship.

Notice: The information contained herein is based on our own research and the research of others, and it is provided solely as a service to help users. It is believed to be accurate to the best of our knowledge. However, no guarantee of its accuracy can be made, and it is not intended to serve as the basis for determining this product's suitability in any particular situation. For this reason, purchasers are responsible to make their own tests and assume all risks associated with using this product.

Physical data

Sd value: 0.14 m
Water absorption coefficient: 0.2 kg/m² x h 0.5
Compressive strength: 812 psi

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