We have a lean-to which contains a bathroom (I think it was previously an external bathroom but that the lean-to was built around it). We also keep our washing machine in there.
I was installing a new washing machine drain when I noticed that the waste pipe drops drops down to the drain under the lean-to via a rather large hole in the floor, which I imagine is letting fumes back up (and making my lovely new P trap quite pointless).
The gap is about 1-2cm wide, all the way around the pipe and I can see the drain beneath.
I was just wondering what the best way to fill this might be? I had considered expanding foam but wasn't sure whether it would just fall down into the drain underneath without some kind of support. Will just spraying the areas that I want it to stick to with water be enough?
I was installing a new washing machine drain when I noticed that the waste pipe drops drops down to the drain under the lean-to via a rather large hole in the floor, which I imagine is letting fumes back up (and making my lovely new P trap quite pointless).
The gap is about 1-2cm wide, all the way around the pipe and I can see the drain beneath.
I was just wondering what the best way to fill this might be? I had considered expanding foam but wasn't sure whether it would just fall down into the drain underneath without some kind of support. Will just spraying the areas that I want it to stick to with water be enough?
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