Mortar joint damage on pre-1930 lime mortar chimneys
Why it happens here
Freeze-thaw cycles from November through March open joints year after year. When a previous contractor repointed with hard Portland cement, the brick spalls because moisture cannot escape through the softer original mortar.
Our approach
We match the original mortar composition, rake joints to the correct depth with a joint raker, and repack with a lime-based mix. We finish with a breathable water repellent so the wall sheds rain without trapping moisture.