John Sayers' Recording Studio Design Forum Archive

HI, one quick question.

Which roxul product compares to owens 703

RXL 40 or

RHT 40

Thanks,

steve

The RXL is supposed to be a bit stiffer, so would stay put better between studs; the RHT is more of a tank wrap with more flexibility at high temperatures, so would tend to sag more in most of our typical applications.

Neither product is a direct replacement for 703; that is a rigid fiberglass product with 3 PCF density, while both of the Roxul products you asked about are 4 PCF.

For actual in-room acoustic treatment, the roxuls would give a bit better LF absorption per unit thickness than 703, but probably a bit LESS higher frequency absorption especially at the more normal, NON perpendicular incidence. This would usually be a GOOD thing for the most part, as it would keep the room a bit brighter sounding.

For in-wall insulation, 2.5 PCF is about as high as you'd want; lower density improves on LF performance (just backward from intuition, like a lot of things acoustic) - in fact, the standard house insulation (fluffy fiberglass) does as well inside a wall as the more expensive rigid board types... Steve

HI and thanks for your quick reply,

I will be useing this stuff for celing clouds, corner traps , wall treatment and building a soffit.

with wood frame with cloth covering.


so it will need to be as stiff as or close to the 703

what do you think??

I would have used the 703 but AMS cant get it for 2 months! and there fluffy stuff is back ordered for 5 weeks!

Thanks,

steve

Ahhh, AMS. That's where I got my drywall and where I plan to get my insulation too. I like 'em.

RXL. Definitely. If things are normal, you will even save money over using 703; and I defy anyone to tell the diff once the cloth is on... Steve

Cool ! Thank you for your help

steve