foam spray insulation for the attic

faolteam · 18-11-2015 01:35AM #1

Spray foam insulation for the attic - thoughts?

Anyone ever get the attic sprayed with foam insulation?

If so, where you happy with the job, anyone recommended and did you notice an improvement in heat retention?

faolteam · 18-11-2015 10:25PM

thanks

BryanF · 18-11-2015 11:59PM

Don't bump threads, thanks

faolteam · 19-11-2015 10:25PM

about that

Wegian · 22-11-2015 05:53PM

Despite the fact that it is recommended I have been warned about the risks associated with Dry Rot over time with foam insulation as the timber will not be exposed to air. Thoughts?

Gumbo · 22-11-2015 09:31PM

Wegian wrote: »

Despite the fact that it is recommended I have been warned about the risks associated with Dry Rot over time with foam insulation as the timber will not be exposed to air. Thoughts?

I have been seriously looking into doing this for the attic portion of my extension when I get the funding to do my project.

Most spray foam installers come in and spray the hell out of the voids. You still need to let the timber and the roof space breathe. There is one company that I have been looking at that harp on about the fact that they fit a breathable layer in between the joists/rafters first before spraying, thus leaving a 50mm gap to allow for the timber to breathe.

https://www.facebook.com/cpifoam/photos/a.357425204331176.80617.138983776175321/950965104977180/?type=3&theater

horse7 · 26-09-2016 02:10PM

Has anyone had it done,im interested in the breathable with card type.

01-10-2016 08:14PM

I thought the foam these days was breathable ?

Jupiter21 · 03-10-2016 09:08PM

Dont do it.......
I bought a house that had spray on foam insulation under the roof tiles. 15 years later I am about to spend a ridiculous amount of money to do a full roof replacement due to wet rot caused by the spray on foam.
Unless there is a 50 mm gap between the foam and the under side of the felt or tiles you will get the same problem over time. The timber in the roof must have air to breathe.
There are a lot of contractors out there who dont understand how this should be done. Try going after them in a few years not to mention 15 years time.
I can share photos of the resultant damage if interested.

03-10-2016 09:13PM

But isn't there breathable foam these days ?

foam spray insulation for the attic

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