Absorbtion Coefficients for 6" 705 FRK & price?

Posted: Tue May 10, 2005 7:54 am

I looked everywhere and I could not find the absorbtion coefficients for 6" 705 FRK.

Bob's page only has 6" 703 FRK.
http://www.bobgolds.com/AbsorptionCoefficients.htm

..and OC's 700 series product sheet only has values for 1" & 2" 701,703,705.
http://www.owenscorning.com/comminsul/documents/Fiberglas700Series.pdf#xml=http://ocsearch01.oc.iscgnet.com/texis/search/pdfhi.txt?query=700&pr=www.owenscorning.com&prox=page&rorder=500&rprox=500&rdfreq=500&rwfreq=500&rlead=500&sufs=0&order=r&cq=&id=427639d88

Also before I start calling around does anyone know how much 6 or 8 pieces (Whatever they come in) of 6" 705 or 703 FRK runs for?

I'm guessing around $200 or so? I'm thinking of making 6 traps of 6" 705FRK and let that be the end of it. One for each corner and 1 for the front and rear ceiling corners. If you'd recommend me using something else let me know what you think.

Posted: Tue May 10, 2005 11:48 am

I believe 6" 705 FRK is a special order item from OC. IOW, don't bother unless you want to buy a truckload...sorry.

Posted: Tue May 10, 2005 12:00 pm

Vince,

> I looked everywhere and I could not find the absorbtion coefficients for 6" 705 FRK. <

I don't have that either, but here's the results of some tests I did comparing three densities of rigid fiberglass 3 inches and 6 inches thick:

www.ethanwiner.com/density/density.html

Also, there's no need to buy 6-inch thick material. Just get twice as many 3-inch panels and stack them adjacent. Note that if you use the FRK type you need to remove the FRK from one of the panels in the sandwich.

--Ethan

Posted: Tue May 10, 2005 12:42 pm

bpape wrote:

I believe 6" 705 FRK is a special order item from OC. IOW, don't bother unless you want to buy a truckload...sorry.

Yeah its some pretty heavy duty stuff so I imagined something like that would be the case. :\

Ethan Winer wrote:

Also, there's no need to buy 6-inch thick material. Just get twice as many 3-inch panels and stack them adjacent. Note that if you use the FRK type you need to remove the FRK from one of the panels in the sandwich.

--Ethan

True, True.
If I can only find FRK how difficult is it to remove the covering?

Interesting results in your density tests. Looks like I should probably go with the more coverage route even though that would require me building twice as many frames.

(2 stacked top/bottom in the corners, single sheets in the front, rear, left, right ceiling corners)
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I emailed one of my local SPI distributors about 6" 705 FRK I assume I will get a response back about only being able to buy bulk now. When I get a reply I will email or call them back about their current price of plain or FRK 3" 705.

I will share post here what I find out... Only thing I know atm is that their 700 series prices have gone up 18% since 2004.

Posted: Tue May 10, 2005 12:52 pm

Quote:

If I can only find FRK how difficult is it to remove the covering?

Very easy. It peels right off.

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