Repair Sandstone Window Sill | ((new))

The following "like-for-like" repair system is recommended to ensure breathability and longevity.

Use a hammer and chisel or a wire brush to remove any loose, crumbling stone and flaking paint.

We recently repaired this weathered sandstone window sill: ❌ Deep cracks, spalling (flaking surface), and water ingress. ✅ The fix: 1️⃣ Raked out old, failed mortar. 2️⃣ Applied a breathable stone repair mortar. 3️⃣ Reshaped the profile to match the original. 4️⃣ Finished with a water-repellent (but breathable) sealer. repair sandstone window sill

Left side: 100+ years of rain, frost, and neglect. Right side: Repointed, reprofiled, and revived.

The before vs. after on this sandstone window sill repair. ✨ ✅ The fix: 1️⃣ Raked out old, failed mortar

#HeritageMasonry #StoneRepair #BuildingConservation #Sandstone

Small chips can be patched, while larger breaks may require molding with a repair mortar. and neglect. Right side: Repointed

A split-screen before/after works best. Show the cracked/damaged sill on the left/top and the smooth, repaired sill on the right/bottom.

Case Study: Structural repair of a decayed sandstone window sill.

Differential weathering had caused deep surface loss (up to 20mm) and hairline fractures threatening the sill's integrity.