Owen-Corning 705FRK (Strike 2)

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cellardweller

cellardweller

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Talked to a guy from Lowes. He said He could get the 705FRK rigid fiberglass.



!!!$350.99 for 120 square feet!!!



May as well buy pre-made bass traps and save myself the aggravation!!!

There HAS to be someplace I can find rigid f/g cheaper...
 
I called local insulation contractors and asked if they'd sell to me directly.

I couldn't get OC 703 or 705 either, but did find some Johns Manville SpinGlas which seemed very similar to 705 in terms of absorbsion coefficients and density. $1.74 a square foor for 2" stuff (6 lb per cubic foot density).
 
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You don't need 705. 2" 703 will work just fine. Should be about $1.25/sq ft.
 
What is the difference between rigid and semi-rigid?

I also have to address the spaces between floor supports, as I'm in a basement with a low ceiling. Doesn't this need the 4' thick 705?
Another consideration (with the ceiling), should I (if I ever find the stuff) alternate between facing out and facing in, to allow for more high reflection?

Thanx.
 
Dweller,

> I also have to address the spaces between floor supports, as I'm in a basement with a low ceiling. Doesn't this need the 4' thick 705? <

You'll get similar performance for much less cost if you pack the space between the joists with one-foot thick fluffy fiberglass. Rigid fiberglass is great when you don't have a lot of space, like when putting panels on a wall. But since you have a foot of depth there anyway, a foot thickness of fluffy fiberglass works very well.

> alternate between facing out and facing in, to allow for more high reflection? <

I prefer a totally reflective floor with a totally absorbent ceiling. Or at least a mostly absorbent ceiling - you could put the fiberglass paper side down along the edges. So the majority of the room has a completely absorbent ceiling, and a 2-4 foot band around the perimeter has the paper side down. Any place in the room you intend to use overhead mikes should be totally absorbent above.

--Ethan
 
Wow, that'll shave a significant amount of expense off of this using the standard "fluffy" fiberglass for the ceiling. Thanks for the info.

I currently have carpet covering most of the floor. Would you recommend removing this or just putting the paper side down (out) between the floor supports?

Is there any other way the standard fiberglass roll insulation can be used? Anything is an improvement from my current situation probably, but would it be significant enough to warrant the effort?
 
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