Why “simple repairs” can damage historic stonework

Stone buildings look solid and permanent. But often the damage we see isn’t from age — it’s from the wrong kind of repair.

Many traditional walls were built with lime mortar, which allows the building to breathe and release moisture naturally. Hard cement doesn’t. It traps moisture inside the wall. When that moisture freezes, the stone begins to crack and flake — meaning the repair actually causes the damage.

Historic buildings were designed to breathe and move. When we use materials that are too hard or too rigid, problems follow.

In heritage work, the right repair makes all the difference.