R value for bubble wrap

Unknown

be fair josh!

1.65 according to testing ;)

1 is no insulation at all. have to add in that concrete, dirt and gravel too!!!

Bob Sweet

Anyone have

a rough estimate for the r value of bubble wrap?

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Josh M.

Under a slab? 1

Bob Sweet

Thanks Josh !!

Trying to get a heat loss out for a replacement job.

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Josh M.

Almost let someone talk me into installing it on a 60,000 square foot building back in the days when they were claiming an R value of 11. Glad I had the discernment to not believe them!

Steve Ebels_3

Virtually nothing under a slab

I was at a (former) customer's place troubleshooting the install the low bidder did on their 10,000 sq ft repair shop this past January. Long story short...........there was no snow within 5 feet of the entire perimeter of the building. Their new heating guy recommended two layers of bubble junk under the 6" slab. I recommended 2" of blueboard and didn't get the job. They lost.

Josh M.

Well Steve, I'm guessing it was a blessing in disguise after all was said and done anyway!!

Rich L.

Check out:

http://healthyheating.com/Page 55/Page_55_o_bldg_sys.htm

Robert Bean's site has some fantastic info on the subject.

Greg_40

Reflectix brochure

says R=1.1 beneath slab.