M110-Historic Pointing Mortar Type O

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Product Details

Technical Data
Liquid/Plastic Phase  
Ratio water/dry material 1.2 to 1.5 fl. oz./lb.
Volume mixed mortar M100 in inches/3 per lb. of dry material 12 fl. oz/lb.
Hardened Phase
Compressive strength, wet 900 to 2200 psi
Compressive strength, dry 1000 to 2300 psi
Tensile bending strength, wet 700 to 800 psi
Tensile bending strength, dry 943 to 1000 psi
Tensile strength 87 to 145 psi
Linear coefficient of thermal expansion 6.3E-06 to 6.5E-06 (in inches) °F
Hydraulic coefficient of expansion (%) 0.076 to 0.089
Modulus of elasticity 1730 to 1860 ksi
Open porosity (%) 34 to 36
Absorption (%) 1.4 (approx.)
Specific gravity 1.4

Department Details

Historic Pointing Mortar

Jahn M110 Historic Pointing Mortars have been designed to be used where other mortars have failed. These single-component, cementitious, mineral based pointing mortars are specifically formulated for the restoration of limestone, sandstone and brick mortar joints. Jahn M110 contains no latex or acrylic bonding agents or additives, and is compatible with historic masonry. Each pointing mortar formula is designed to have a lower compressive strength than the surrounding masonry. These mortars perform well even in situations where previous methods and materials have failed due to repeated water and salt saturation. The material is completely vapor permeable and may be custom colored.

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.

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.

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.

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.

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 10 years in original, unopened packaging.

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