[Greenbuilding] Spray Foam Over Loose Fill Attic Insulation

[Matt Dirksen]

Never seen or heard of that happening. I seriously doubt the spray foam
manufacturer would allow that per their installation instructions, and
would have probably voided any warranties in the process.

If it were my house, I'd have them take everything out (including the
contaminated loose fill), and go back to square one.


On Wed, Jul 20, 2016 at 4:53 PM, Stephen Collette <
stephen at yourhealthyhouse.ca> wrote:

> Hello everyone,
>
> So I did a job today where the very old house had loose fill insulation
> (ok it was vermiculite, and I was testing to see if it may contain
> asbestos, but that’s besides the point). The house is going through a full
> gut and remodel and the GC had the insulation spray foamed. The spray foam
> installer, sprayed over the loose fill insulation. They did an absolutely
> terrible job as an aside, it was lumpy, bumpy, gappy and over 6” thick in
> some spots, with what was apparently a single pass spray. So poor
> workmanship all around in my opinion by someone who doesn’t know what they
> are doing.
>
> That’s all background.
>
> Has anyone ever heard of spray foaming over loose fill insulation? It
> seems like a really bad idea to me. I’m thinking settling of the loose fill
> and air gaps, the stuff isn’t bonded to anything as I just went up and cut
> out bits to take my vermiculite samples here and there. Seems silly and
> specifically from a thermal performance perspective I have concerns.
>
> Thoughts out there in GB list land?
>
> Thanks
>
> Stephen
>
> Stephen Collette BBEC, LEED AP, BSSO
> *Your Healthy House* - Indoor Environmental Testing & Building Consulting
> http://www.yourhealthyhouse.ca
> stephen at yourhealthyhouse.ca
> 705.652.5159
>
>
>
>
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