Repointing with Lime Mortar
Our specialty is the restoration of historic buildings, both residential and commercial, primarily through lime mortar repointing. Most of our projects involve extensive removal of earlier mortar repairs made using Portland cement. These repairs have generally caused damage to the masonry. We accept projects both small and large, and all are done with a concern for the long-term preservation of the building.
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Repointing is the process of removing deteriorated mortar between brick or stone and replacing it with a compatible material.
The primary purpose of mortar is to protect masonry from the damaging effects of water, the effects of freeze/thaw cycles, natural expansion and contraction of walls, and micro movements in the building. This mortar should be softer than the masonry, protecting it from the damaging effects of water and winter.
Something to keep in mind: Portland cement mortar is a material used in modern buildings. Portland cement mortar should not be used to repoint historic masonry because it can cause substantial damage over time. Portland cement mortars are too hard and not vapor permeable, which can cause expensive water damage. Many conventional masons will use a premixed cement mortar that contains lime. This is not lime mortar, it is cement mortar with some lime in it. Type S or Type N mortar is much harder and less vapor permeable than a lime mortar.
Your home or business is a major investment. Regular maintenance is critical to maintain the value of your investment. Keep in mind that extensive repointing is done only about once every 100 years. Proper masonry restoration is time consuming and expensive but can be done in stages. The cost of repointing depends on many variables; we believe it is better to have the job done correctly over time rather than jeopardize the health of the building. We are committed to making historically appropriate restoration possible for everyone.
Campbell Center Masonry Restoration Workshop 2007
