Suitable for all historic masonry structures without hydraulic binders originally presentThis restoration mortar formulation contains no Portland cement. Portland cement was not made in the United States until the early 1870′s and is generally not recommended for early American masonry. Portland cement-based mortars tend to be impermeable, which can lead to serious damage in historic masonry walls that rely on permeable mortar to wick water out of the wall system. Mortar joints historically provided allowance for wall movement. Lime putty mortar has a low modulus of elasticity which permits the wall to expand and contract without causing the cracking and spalling that is often seen when a modern high-strength mortar is installed in a historic structure. Lime putty mortar also exhibits extensive autogenous healing, a phenomenon unique to high lime mortars, which heals microcracks that form during stress by stitching the mortar back together naturally with free lime particles in the mortar.
Weight: 49 lbs
Features and Benefits– Authentic product formulation ensures compatibility with historic masonry units and mortar.
– Standard aggregate blends and color selection facilitates quick, convenient installation.
– Custom-matched aggregate profiles and colors produce unbelievable visual accuracy.
– USHG provides unmatched product and project support, for one pail or hundreds, to ensure excellent results for every installation.
DocumentationHeritage Restoration Mortar – Type L – Datasheet.pdf
Heritage Restoration Mortar – Type L – SDS.pdf