Hi. I need to replace the mortar above and below two upstairs windows again but every time I do it cracks and some of it falls out after a few years! I’m obviously missing something. What’s the secret to keeping that solid and in place? It’s probably 1” high and 3” deep across the width of each 4’ window. Thanks.
Mortar above and below uPVC window
- Thread starter Sparky54
- Start date
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Sorry about the delay. This is one of the two windows. Forgot the flashing is involved. The mortar just doesn’t stay in one piece in there for very long.
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Differential expansion and contraction. You need something other than mortar, which allows some flexibility.
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