Cracked Render Repair with Flexible Cork Spray

Traditional cement and acrylic renders are rigid. Buildings move — through thermal expansion, settlement, wind loading and seasonal moisture cycles — and rigid render cannot flex with that movement. The result is cracking.

Once cracked, the render lets water in. In winter, freeze-thaw widens the cracks. Patching with more rigid material often leads to re-cracking in the same place, because the underlying movement hasn't been addressed.

Full re-rendering is the conventional answer — strip everything off and start again. It's expensive, disruptive, and the new rigid render can crack in exactly the same way.

The existing render is assessed, cleaned and any loose or delaminating material removed. Wider cracks are raked out and pointed as needed. A primer is applied where required.

The cork coating is then spray-applied in thin layers directly over the prepared surface. It bonds to masonry, render, stone and brick — conforming to every contour without cold bridges.

Because cork is elastomeric (it recovers from deformation), the finished layer flexes with ongoing building movement — sealing existing cracks and resisting new ones.