Big draft behind vanity

Ckb3216

Recently had plumbing work done and he redid the plumbing behind my bathroom vanity...im getting a serious draft coming from this hole, the wall is tiled, so any ideas of a quick fix to stop this draft!? Attached is a picture...

joecaption

Looks like he used an M80 to make that hole.
First I would go under the house in that area and seal up the holes through the bottom plates with high expanding foam, then about all you can do now is stuff fiberglass insulation in that hole.

Ckb3216

Im on a slab and this bathroom is on my bottom floor

joecaption

Where does that drain pipe come from and where is it going.

Ckb3216

Comes from upstairs bathroom and runs to the left and out of the house into sewer...to the left outside and behind this wall on otherside is my kitchen

Ckb3216

Im sorry it doesnt go left it goes right into the slab and out

joecaption

Strange to have a breaze in an inside wall. I'd be looking in the attic around where the vent goes through the top plate for a gap that needs foam around it. The falling cold air from the cold attic may be it.

creeper

I just had an energy audit performed and that is the exact spot that I was told to fill with insulation. I was told it is totally normal. I was also told to install safety plugs in unused outlets. Even the ones on inside walls

biggles

cold air is just dropping down and hitting the hole slab adds to the temp also.a spray can of foam HD/LOWES start in the back and foam it out go slow cause that stuff expands super fast and sets.old rag stuff in there for now

Ckb3216

No attic..

joecaption

Never heard of an energy audit that called for safety plugs in outlets, sure they did not mean foam die cut outlet covers that go behind the covers of outlets and switch covers?

Ckb3216

Yeah prob, i put those around my house i have such a drafty cape.

Ckb3216

I have about 2 ft from slab to where i am foaming, being im in the wall the foam wont sit, any ideas what i can use to prevent the foam from dropping into the wall??

creeper

Joe: both the foam backs and the baby covers will work

Ckb3216

Spray foam is now my new best friend.