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Preservation Brief #2: Repointing Mortar Joints in Historic Buildings

(Published by the National Park Service)
 
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Heritage Mortars
U.S. Heritage Group, Inc. offers a range of traditional lime-based mortars that are suitable for masonry restoration and sustainable design projects. Our products are preblended, which eliminates on-the-job mixing errors and provides enhanced quality control, and they are non-toxic and all-natural.
Heritage Mortar Selection Chart:
Product Name Description Notes

Heritage Prepared Straight Lime Putty Mortar (Type L)

Restoration mortar that is suitable for masonry structures constructed in 1871 or earlier Just blend and use. No need to add water. Perfect for small repointing jobs or projects with tight quality control specifications. Available in standard and special request colors.
Heritage Prepared Lime Putty Mortar with Cement Pouch (Type O) Restoration mortar that is recommended for masonry structures constructed between 1871 and 1931. Add the enclosed cement pouch to preblended mortar mix. Perfect for small repointing jobs or projects with tight quality control specifications. Available in standard and special request colors.

Heritage Preblended Cement/Hydrated Lime Mortar
(Type O)

Restoration mortar that is recommended for masonry structures constructed in 1931 or later. Preblended with sand. Available dry in buckets or bags--just add water and mix. Bags can only be shipped freight.
Heritage Hydraulic Lime 3.5 Mortar Recommended for historic or new construction masonry. Suitable for areas that are exposed to damp or extreme conditions. Preblended with sand. Available dry in buckets or bags--just add water and mix. Bags can only be shipped freight.
Natural Hydraulic Lime 3.5 (Moderately Hydraulic) Recommended for historic or new construction masonry. Suitable for areas that are exposed to damp or extreme conditions. Natural hydraulic lime. Blend with water and sand for a complete mortar mix. Available dry in bags. Bags can only be shipped freight.
Custom Blended Mortar Restoration mortar that is recommended for projects where the specification requires a replacement formulation that replicates the original in appearance and composition. Custom blended materials are produced used chemical or petrographic test results.
Slaked Lime Putty Slaked lime putty is created by combined quicklime with water and then mixing it and
aging to it to ensure a smooth consistency. Slaked lime putty is used in mortars, plasters, and frescoes.
Aged lime putty is available.
 
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