Spray foam insulation / Discussions

...spray foam contractors who propose to spray foam to onto the suspended floor and under the roof ( converting to warm attic), pouring foam in the air gaps in the walls from holes drilled in the dry lining. The foam will form an air seal envelope and insulate. They say the foam is permeable. I think spraying the suspende...

...insulation. The easiest way to install exterior insulation on old homes Choosing the right insulation How to install a peel and stick air barrier membrane How to install siding so walls can dry  

We built a new home two years ago and having issues with being too dry in the house. Right now today the temperature is 2 degrees outside and the moisture in the house is 22 % The humidity in your home is largely affected by the humidity levels outside. Happy to help sort this out with you I just need some more info. W...

...spray foam has been applied? If so – how thick is the spray foam, and how complete is it? Spray foam acts as a vapor barrier so there would be no need for a poly vapor barrier behind the drywall as no moisture should make it that far. If they forgot to do the joist cavities at the top I would expect you might find mois...

...spray foam insulation has failed? It's hard to ever weigh in on a problem with complete confidence without seeing a project or knowing the full wall assembly, but if anything, that may actually show a 'success' of the spray foam rather than a failure. The wood studs will transfer far more heat than the Spray Polyuretha...

...spray foam insulation don't cause climate change More on spray foam:  Spray foam insulation poses a problem for removal and disposal The potential risks of spray-foam insulation Chemical off-gassing in open cell vs closed cell spray foam I would go ahead with spray foam in this case, the only thing I would suggest is...

...spray closed cell i will only have a 12 mil poly vapor barrier in the sand floor. i will then have to heat that crawl and put an fan it exhaust the air to outside. what should I do? and can the closed cell option work with just the poly or is it not worth it.  Thank you !

...insulation to install.  And to be sure I understand, it sounds like your preferred finish is to leave the rafters and bays between them open as the interior finish, which would mean insulating the outside. If that is the case, yes you can, you would want to insulate it the way you would exterior walls, and then install...

...insulation onto the siding unless this is a cottage with open stud walls so you see the back of the siding from inside the house. But the short story is – walls need to be able to dry, and I don’t see how they will if you spray foam the back of the wood. Exterior siding is meant as a weather shield, it protects the con...