expansion crack between patio and extension wall

Michael Rosen · 2026-08-18T19:30:08+0100

Hi, I have just discovered this crack caused by a sinking patio in the hot weather. It's in the angle between my house wall and the patio Would the best repair for this be something like a silkaflex ebt+ sealant and backer rod? The gap looks about 10mm wide and maybe quite deep. I really would like to avoid any problems with water seeping down into it and getting into the wall.

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expansion crack between patio and extension wall

Michael Rosen

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