BadgerBadger Posted November 24 Share Posted November 24 Our build has beam & block floor with masonry cavity walls, the inner leaf extra wide DPC was built in and left hanging ready for the DPM to be joined to it. That time has now come! 😅  I'm getting mixed messages on how to seal the DPM to the DPC. Should I be using the double-sided butyl strip stuff between the lap, with extra single-signed DPM tape over the joint? Or is something else commonly done?  Similarly, if need to join to sections of DPM I've heard everything from "just overlap it lots" to the same double-taping as above. Link to comment Share on other sites More sharing options...
nod Posted November 24 Share Posted November 24 Probably worth going round the dpc with hot water and a sponge I used a single sided render tape (Jaffa) 1 Link to comment Share on other sites More sharing options...
Oz07 Posted November 24 Share Posted November 24 When overlapping dpm I've always gone 300mm and tape. You can but dpm tape at merchants which seems to be 4" wide and similar to electrical tape. Ive used that before. Also used good quality duct tape and not had problems. Ive always folded dpm over top of masonry as built not sure what the detail connecting to dpc is but double sided tape with dpc folded down and dpm coming up sounds good Link to comment Share on other sites More sharing options...
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