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Spray foam attic insulation vs regular blown in cellulose (loose) insulation?
Posted on 4/29/25 at 10:19 am
Posted on 4/29/25 at 10:19 am
I’m in need of more/better insulation for my attic as we just removed some trees that provided shade from the western sun and we can feel the difference in the temperature inside. We have the conventional blown in cellulose stuff but it’s pretty old and has settled a lot. I was getting quotes for getting some more blown in on top of what we have but one of the contractors told me about the spray foam variety that is applied to the underside of the roof, and they remove the old callouses stuff. It’s a lot more expensive but I like the idea of not having all the crap on the floor of the attic and apparently the foam is way more efficient effective at keeping heat out of the living space. Does anyone here have knowledge/experience using the spray foam? What are your thoughts?
5
Posted on 4/29/25 at 10:32 am to otowntiger
Personally, I don't like the idea of spray foam right below the roof deck...if a leak happens it could go undetected for a while and you now have a rot situation. I would do a radiant barrier just below the roof deck and insulate the backside of the ceiling with Rockwool. I'd also make sure attic has adequate ventilation if its not an air conditioned space
Posted on 4/29/25 at 11:00 am to otowntiger
I used 2” thick spray foam on the attic floor just to seal off the ceiling penetrations from ceiling fans, lights, etc. Then blown cellulose on top to give the desired R - rating. I also used reflective sheeting on the underside of the roof decking.
Posted on 4/29/25 at 11:08 am to otowntiger
quote:Got it at our old house and kind of regretted it. It makes it hard for anyone to do work on your house, especially, electricians. It's really not the best idea for older homes, though I can see it having a place in new construction.
Does anyone here have knowledge/experience using the spray foam? What are your thoughts?
Go with the tried and true. Nothing wrong with blown in.
Posted on 4/29/25 at 1:20 pm to otowntiger
My house was built in the early sixties and I had my roof deck spray foamed about 10 years ago. It has been a learning experience but I’m still happy with the results. We had it done instead of new ductwork and replacing existing fiberglass batts. Few things to consider. The permanent seal highlights the amount of moisture in the house due to the reduced amount the A/C will run. To combat this we upgraded the system to a 16sear multistage unit with an additional dehumidifier. It was time to replace anyway but it allowed us to downsize a step. The point about wiring or doing work in the attic is also a good point but only relevant if you intend to do that sort of work.
Posted on 4/29/25 at 8:48 pm to otowntiger
If it matters/you care, spray foam is going to void all manufacturers warranty for your roof. Just something to think about. How often are people using their warranty…rarely but in the chance you do…you won’t win
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