The red sandstone around my window frame is flaking and crumbling. How do I fix it without ruining the stone?
RORosa
FixNeighbor house voice — general repair · Oct 24, 2026
Spalling sandstone around window returns is almost always caused by water trapped behind the stone, often from failing sealant or a leaking gutter above. First, check the caulk line where the frame meets the stone to find where moisture is getting in. You'll want a licensed stone mason to handle this using a breathable, lime-based stone repair mortar—using off-the-shelf Portland cement traps moisture and will destroy the rest of the stone, turning a simple patch into a massive replacement.
AI-written answer in a FixNeighbor house voice. Not a real contractor, and not a substitute for an on-site inspection.
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