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In Reply to: Re: Polyester batting substitute posted by Xenithon on June 18, 2004 at 04:43:16:
Quick update - the only fiberglass I can get which is the same price as the pre-formed pipe coverings is Aerolite but that is only 11kg/m3 - is that not dense enough? I see it has an NRC of around 0.8, whereas what I wanted to use originally (40kg/m3 CAVITYLITE) has an NRC of around 0.95. I have read your posts again about why the SQ&D traps are better than using pre-formed pipes, but at $100 for the cavitylite roll it seems cost prohibitive. If the Aerolite is good enough though then I will definitely use that.Cheers,
X
Follow Ups:
Teh density unrolled is not as critical as the density when it is still rolled up. It maybe that the 11kg/m3 stuff will be fine when it is rolled up.
Jon Risch
Hi There,Thanks for the confirmation. I did some further searching and am pretty sure it is the stuff, since I calculated that a roll ends up being R-19 which others on the board have said they have used (R-value is 1.88 per m2, and there is 10m2 per roll). Also they say when they did not cover it up they had a pink panther staring at them :) which pretty much certifies the stuff, since that is Aerolite (think pink) which is a global brand of insulation.
I have ordered some from a store and it should be here soon. Will post results when I have played around.
Thanks for the all the help Jon, much appreciated.
One quick question about absorption panels, now that the bass traps are sorted - I have seen people making DIY panels linke those on your site consisting of the frame, inside of which there is a 1-2" rigid fiberglass board, on top of which is 6-8" fiberglass, lightly compressed, then the usual batting/burlap to cover. Do you know if this would be more or less effective than the previous design we talked about which was a 1" rigid fiberglass board of around 80kg/m3 then a 2" thick board of around 40kg/m3 then batting/burlap. In other words, replacing the 2" board with around 6-8" of this think pink fiberglass.
Cheers and have a good day,
X
Based on my own expriences and testing, the 6-8" of fiberglass will overall outperform the 2" board, no matter what density. However, it will be a lot thicker on the whole too.
Jon Risch
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