Seal out drafts where pipes go through floor.

Zipper13

I'd like to add some sort of seal around the supply and condensate pipes where they come up through the floor to help reduce the flow of basement air into the living space.
I figure the foam hot water pipe insulator sleeves might not do well on the supply side with the heat?
Any other options that will have the squish needed to get it in and also to allow for expansion/contraction a bit?

Leon82

What about The fiberglass with the white paper on the outside

Jamie Hall

Ideally this is what you'd use...
https://www.amazon.com/GREAT-STUFF-Fireblock-Insulating-Sealant/dp/B001AQ3OGA/ref=sr_1_2_sspa?hvadid=77653060108725&hvbmt=be&hvdev=c&hvqmt=e&keywords=firestop+foam&qid=1559680740&s=gateway&sr=8-2-spons&psc=1

ChrisJ

Jamie Hall said:

Ideally this is what you'd use...
https://www.amazon.com/GREAT-STUFF-Fireblock-Insulating-Sealant/dp/B001AQ3OGA/ref=sr_1_2_sspa?hvadid=77653060108725&hvbmt=be&hvdev=c&hvqmt=e&keywords=firestop+foam&qid=1559680740&s=gateway&sr=8-2-spons&psc=1

I'm pretty sure that's just normal spray foam that just happens to be orange...

You sure putting that in contact with a steam pipe is a good idea?

ChrisJ

This picture is literally going to give me nightmares.

STEVEusaPA

Usually fire caulk is highly toxic. I have a feeling this is an exposed application (in the basement).
How much air is really coming up from the basement? I'm surprised it's enough to even notice.
I'd consider using about a 3" long piece of the standard fiberglass, around the pipe and sealed to the underside of the basement ceiling.

Leon82

The Fire caulk I used dries hard, seems like it would make noise if a pipe was expanding in it

Intplm.

Cut to size fiberglass insulation with high temp caulk.

Jamie Hall

ChrisJ said:

Jamie Hall said:

Ideally this is what you'd use...
https://www.amazon.com/GREAT-STUFF-Fireblock-Insulating-Sealant/dp/B001AQ3OGA/ref=sr_1_2_sspa?hvadid=77653060108725&hvbmt=be&hvdev=c&hvqmt=e&keywords=firestop+foam&qid=1559680740&s=gateway&sr=8-2-spons&psc=1

I'm pretty sure that's just normal spray foam that just happens to be orange...

You sure putting that in contact with a steam pipe is a good idea?

It is fire rated, but some jurisdictions may not accept it -- requiring one of the intumescent foams instead. Check with the AHJ.

Bob Harper

Technically, if the structure is built under the IRC (max 4 floors residential) you can chink it with rockwool insulation. You shouldn't need to worry about intumescent foams and such unless that floor is a fire rated assy. Rockwool doesn't stink, doesn't support mold growth, not friendly to bugs and rated 1,400°F.

Zipper13

Thanks for the input! I have a few radiator pipes that have holes about 1" too big in diameter through the floor. They are covered cosmetically with one of those chrome split disc rings, but I suspect it's a highway for the house centipedes to come upstairs at night and in the winter, when the radiators cool, there is a cool draft coming up through which can make it slightly less comfortable to sit near by in between cycles.

Its a minor thing, but I figured there are wrong ways to correct it and wanted to avoid that.

Stuffing it with rockwool from below sounds like the easiest fix.

Zman

Jamie Hall said:

ChrisJ said:

Jamie Hall said:

Ideally this is what you'd use...
https://www.amazon.com/GREAT-STUFF-Fireblock-Insulating-Sealant/dp/B001AQ3OGA/ref=sr_1_2_sspa?hvadid=77653060108725&hvbmt=be&hvdev=c&hvqmt=e&keywords=firestop+foam&qid=1559680740&s=gateway&sr=8-2-spons&psc=1

I'm pretty sure that's just normal spray foam that just happens to be orange...

You sure putting that in contact with a steam pipe is a good idea?

It is fire rated, but some jurisdictions may not accept it -- requiring one of the intumescent foams instead. Check with the AHJ.

I think this is a good application for fire foam assuming there is no required rated assembly.

But, maybe I have lost my mind because a thin bead on the exterior of an electric box trimmed flush would not give me nightmares.