DPM repair

[Omi]

Hi everyone,

 

I noticed that there are a couple of vertical tears in our DPM where it comes out of the slab and is meant to lap with the DPC.

 

What's the best way to repair this and should I even bother?

 

Thanks.

 

[markc]

If possible, clean out some of the debris and slide more material into the gap overlapping the original where possible. As an added bit of protection you could also flood liquid membrane into the joints or voids

[dangti6]

Yeah, tuck and tape where possible 

[Omi]

Thanks ??

Not really possible to tuck into the slab so will try lapping some new membrane over the tears as close to slab as close as I can and then tape.

 

[TonyT]

https://www.screwfix.com/p/everbuild-dpm-polythene-joint-tape-black-20m-x-75mm/713FR?tc=MC3&ds_kid=92700058168037085&ds_rl=1249416&gclid=CjwKCAjwp_GJBhBmEiwALWBQk1-LUP_xatiCxPo8DOc3Ni2W-fG-qKtMXb1nQNB6-xVZ418cAK-aVRoC6MsQAvD_BwE&gclsrc=aw.ds

[Omi]

I've also got some Black Jack D.P.M. that I intend to use to seal the inside and outside edges of the repair. Hopefully that'll be enough.

 

Now the next challenge - I noticed that the builders have cut away the DPM from a few sections where the wall upstands join the perimeter (inner leaf) wall. In these sections, the DPM extends about half way up the joint and the remaining bit is mortar:

 

 

 

What's the best way to address this? I'm worried about lateral damp transfer through the joint but not sure much can be done about that at this stage aside from just adding the DPC as normal?

 

Thanks!

[markc]

Blackjack is good.

im guessing your builder is an old schooler who is new to all this modern way of doing things and used the mortar to tie-in the upstand. Easy enough to rake the mortar out, insert the DPM and point up again