Quote:
Originally Posted by jelstro  This was cost per 2X4 panel, not sq/ft, but still, this is a huge help.
I thought the "pink fluffy", which is indeed what we have, was a little bit thicker than that. But I'm still wondering... what would really be lost by packing in a lot of the pink as opposed to single board of 703?
Would it basically be wasted space or would it still be a lot better than going completely untreated? |
My bad... I didn't read close enough on the price... but still, the numbers are essentailly the same...
The thickness isn't as important as the mass.
Pink has about 1/4 of the mass of 703. So, until the mass of the pink stuff approches the mass of the 703, you won't have anywhere near the amount of energy absorption that you do from the density of the 703.
I saw the numbers a LOOOONG time ago, so, I'm not sure they're quite right... but IIRC, two layers of R-13, packed as tight as 1", was less than 1/4 as effective at all frequencies of 2" of 703. 3 layers of R13 packed to a density of 1.5" was still only half that of 703. Even when 4 layers of 703 were packed to 2", it was still something like 80% or 85%.
Seems like someone found fault with numbers because it was really two 1" compactions... but regardless... it wasn't nearly as effective as a single sheet of 2"- 703.
But to finally get to your question, IMHO, yes, something is better than nothing.
What many folks have actually done, is to stack their still factory taped rolls of of insulation in the corners, and put frames up to hide them.
Again, the cross corner 703 panel, with the back of the corner filled with pink fluffy was found to be a wider "Q" and therefore, a "better" broadband absorber.