Jahn M100

* Terra Cotta Repair
* Brick Repair Mortar

CERTIFIED INSTALLERS ONLY

This single-component, cementitious, mineral based mortar is designed for the restoration of terra cotta and brick surfaces. Jahn M100 is completely vapor permeable and contains no latex or acrylic bonding agents or additives. M100 is specifically engineered for compatibility with oven fired materials to provide a permanent repair which both enhances and protects the original substrate. (Only Certified Installers may purchase Jahn M100 Terra Cotta Repair Mortar.)

To restore the original glaze and keep water from entering the substrate through the new repair, use TerraCoat Glaze Repair to paint the repair. (Call Cathedral Stone at 800-684-0901 for more information about our complete line of TerraCoat Glaze Repair products.)

Features And Benefits

*Single-Component: Mixes with water only, improving quality control and consistency of application.
*Compatible Formulations: Compatibility of physical properties ensures that the mortar and natural 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, Premium, and Custom Colors.
*Certified Installers: Only installers with certification from Cathedral Stone Products can purchase Jahn M100 Terra Cotta and Brick Repair Mortars.

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.

Section: Correct (Square Cut) Surface Preparation


Section: Incorrect (Feathered Edge) Surface Preparation

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 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.

Technical Data
Jahn M100

Warning
Not for internal consumption. Keep out of reach of children and animals.

Product data last updated 2/2000