learner Posted October 6, 2021 Share Posted October 6, 2021 i have discovered the outer leaf of blocks in my extension has a few mm gap from top to bottom of the wall which looks like it was put for a reason as the blocks are cut. I cant see if the same is on the inner leaf as there is another wall coming off at a right angle. Is this an expansion joint or have they messed up.? Link to comment Share on other sites More sharing options...
learner Posted October 6, 2021 Author Share Posted October 6, 2021 The gap breaks the stretcher pattern of the wall Link to comment Share on other sites More sharing options...
Temp Posted October 6, 2021 Share Posted October 6, 2021 Sounds like an expansion gap. They are normally required in long walls over 11m. Link to comment Share on other sites More sharing options...
learner Posted October 6, 2021 Author Share Posted October 6, 2021 The wall is just over 10m. Should it be filled with some sort of mastic? Link to comment Share on other sites More sharing options...
Temp Posted October 6, 2021 Share Posted October 6, 2021 I think ours just has some sort of foam sheet in it but it's on the sheltered side of our house. I think a low modulus sealer is recommended.. https://www.sealantsonline.co.uk/ProductGrp/Dowsil-791-expansion-joint-silicone-sealant Link to comment Share on other sites More sharing options...
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