A dpc detail...

JohnChadwick

Dpc tray in black resting on top of the finished floor. Radon DPM underneath in grey. Radon DPM is flat across the house on top of subfloor.

In my mind water that comes down the dpc tray rolls off and onto the sliver of radon dpm. A percentage of it falls outside and isn't an issue.

But (in my mind) a certain percentage also goes back over the radon dpm (i.e. between the plastic sandwich) under the blocks and into the insulation which sits on top of the subfloor.

Am I making sense in my thinking here? The sign off Engineer, the builder, and a architect have not given any solid opinions on this to reassure me.

Mellor

https://www.boards.ie/discussion/2058334274/a-dpc-detail

It's less about the water coming down and back, but the bigger issue of water ponding at ground level water coming straight in over the DPM.

Is the DPM definitely fully horizontal? I should go up and over the inner leaf behind the DPC tray, and back down to the sub floor level. Can't tell that its not from this photo. Lift it up and have a look

This thread below is the issue in a nutshell.

https://www.boards.ie/discussion/comment/121531204#Comment_121531204

bfclancy2

https://www.boards.ie/discussion/comment/121709160#Comment_121709160

same poster, was told how to correct in previous thread, obviously ignored the advice

Mellor

https://www.boards.ie/discussion/comment/121718736#Comment_121718736

Oh, lol. Not sure how I missed that. Thought a different poster was the OP