Saul Posted April 3 Share Posted April 3 Would love to get advice & thoughts on how a serious issue might be appropriately resolved. Lab tests have just confirmed that M4 mortar has been used below DPC on my house. Further to this it appears the DPC Membrane has been laid quite far back ie it is recessed from the face by about 25mm. This will presumably cause bridging, especially with the sandy M4 mortar and therefore result in rising damp. The DPC has been laid in rough face bricks rather than engineered bricks but they are classed as S2 F2. Feeling anxious and worried. The house is rendered Block above DPC. Thank you Link to comment Share on other sites More sharing options...
Mr Punter Posted April 3 Share Posted April 3 I doubt the mix will make much difference. I have seen tests on some of the batch mortar and it can sometimes be a third of the advertised strength. The DPC is annoying but survivable. I assume the inner leaf has a proper DPC and if so you should not notice. If you do have issues you may be able to rake out the 25mm and repoint using waterproof mortar. 1 Link to comment Share on other sites More sharing options...
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