I was told I needed to put insulating foam in the holes in the top plate created for electrical wiring...?

Question

Do I need to put the foam in the studs where the electrical wiring goes through? This is for Fire codes in MN...

Answer 1

This isn't a fire code, but an energy code. It is to prevent drafts, and is around all holes, not just wiring (like plumbing etc). Expanding polyurethane foam is usually used for that. It should say on the can that it is not harmful to the wiring and PVC pipes etc. It doesn't need any kind of fire rating.

I assumed you are talking about a house.

I am in Minnesota, and I know that this is an energy code thing and not a fire code thing for houses in Minnesota.

Answer 2

This is a Fire Code and not an Energy Code. Do not use foam. Use only fire caulk. Electrical wires can and do start fires. If any hole is left open in the plates the fire will travel up into the attic or next floor faster.

Answer 3

I am suprised that they dont just use a "fire break" in the walls.

Simply put, a 2X4 or, 1X4 going horizontal, instead of verticle like studs, so that the flame is blocked from going up into the attic or next floor. (its what we use in Ohio). Its in the same wall cavity as the electrical outlet.

I dont know if the "foam" is flamable or not, as I never had to test it around a fire..(I have it in all the sills of my basement to keep the cold out, and hope I never have a fire down there!)...

If they require it, then I suggest that you get it. Its only about 5 bucks a can at LOWES, so its not like it will break the bank or something of that nature.., and I wouldnt also, think you needed them in the stud holes, sill plate, I can see, as it is the very exit to the top floor or attic.


I wish you well..

Jesse

Answer 4

The fire code may require it to prevent the spread of a fire or the stoking of a fire from air moving into the stud bay. If it is required by your fire code then do it. Not a lot of work or expense.

Answer 5

Use Fire caulk, nor foam. In New Jersey it is illegal to use foam because it creates toxic fumes when it burns, and yes it burns.

Answer 6

Are you doing the work yourself, and will it be inspected when the work is completed. If it's not going to be inspected and you're using Romex (non-metallic sheathed cable) which is adequately insulated... who cares and why bother.