[Greenbuilding] Foam insulation advice needed

[Michael O'Brien]

Hi, all--

I apologize in coming late to this discussion so please excuse if this comment has already been made.

We looked for a sub-slab insulation to replace extruded polystyrene but could not find any with the minimum compressive strength required by code. I doubt that a spray-in foam would qualify, unless the slab has some other integrated support, such as a coffered structure.

We used Roxul rock wool batts for perimeter insulation, which cuts the greatest heat loss, at the slab edges into the coldest ground. 

We used 2" of Demilec spray-in foam for vaulted ceilings and rim joists, combined with unfaced fiberglass batts, to get a good mix of air sealing and effective insulation. We did not experience any health-related reactions to the foam, although I did note the crew wore respirators and full-body suits. Their explanation was to avoid inhaling small droplets of foam and keep same off their clothing. As far as I can determine there are no significant hazardous emissions from the cured-in-place foam.

Best,

Mike O'Brien


On Jun 13, 2011, at 10:54 AM, Bobbi Chukran wrote:

> We finally got some info. from the insulation guy for our new/old home.
> 
> He proposes using an open cell foam, Demilec Selection 500 in the attic rafters.  I'm concerned because even though the company has LEED ratings, etc. that product is still polyurethane based.
> 
> I mentioned that I wanted water-sprayed, and indeed that product is, but I'm still leery of the health issues.  Since I'm chemically sensitive and have asthma, and since we'll be working in the house (although I won't be in the attic) for months, then living in it, I have to be cautious.
> 
> All of the green building info. sites say it's a great product for insulating a home.  But what about the health of the inhabitants?  That's what I have to worry about, foremost.
> 
> Any cautions, comments, etc. about this product?  Thanks!
> 
> bobbi c.
> Leander and Taylor, TX
> 
> 
> 
> OnOn Jun 12, 2011, at 9:08 PM, Lynelle Hamilton wrote:
>>> It's soy based closed cell, no formaldehyde.  I've been near it when sprayed and there is no noticeable odour.  Even so, it's sprayed under the 4" concrete slab and on the outside of the block only.  The ceiling is done with dense pack cellulose.>>
> 
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