Anyone have or have done this kind of job recently? We got a quote last week to remove the old insulation and put new stuff in. The size is approx 16x16 (maybe a little bigger). He quoted me about $5k for that while also really selling me on the tax break I'll get (he said based on the amount of materials you used, I'd get back approx $1k when I file my '23 taxes).
Does this seem right? I'm getting another quote from a different source today and wanted to know if the first quote is what I should expect.
Thanks in advance!
Just wear a mask and gloves
Spray Foam is spendy so that sounds accurate, I had a quote to do my basement rafters around the foundation and it was about 2400.
Closed cell spray foam is the best product to use...but its cost is high these days. Just make sure you DONT use open cell spray foam against the underside of the roof deck. This will collect migrating warm vapor and trap it within the insulation and against the plywood deck - resulting in mold over time.
One other way to go is closed cell for 2-4" under the roof deck, and then batt insulation instead of open cell underneath. This might be a cleaner application if you have an unfinished condition in your attic space.
Never got the chance to do it in my old house.
I would get additional quotes and see what each includes to compare apples with apples
Closed cell spray foam is the best product to use...but its cost is high these days. Just make sure you DONT use open cell spray foam against the underside of the roof deck. This will collect migrating warm vapor and trap it within the insulation and against the plywood deck - resulting in mold over time.
One other way to go is closed cell for 2-4" under the roof deck, and then batt insulation instead of open cell underneath. This might be a cleaner application if you have an unfinished condition in your attic space.
Yep. It’s called flash and batt. The issue is warm moist air hitting a cold surface and condensing. The closed cell foam is a vapor and air barrier and is very dense. This can prevent condensation by preventing air and vapor movement into the cold part of the wall while insulating enough in a short area to move the dewpoint outside the wall cavity. Open cell is vapor permeable like you said and will cause issues
The extra batt insulation is icing on the cake