Insulation

Michael Jones · Post by **Michael Jones** » Sat May 17, 2003 12:54 am

I have two adjacent walls. I'm going to sheetrock one side of each wall. The insulation will be 3" rockwool. With only one side rocked, how do you keep the insulation in the wall?

If it were just regular ol' R39, you'd staple the paper backing to the stud, but rockwool doesn't have a paper backing, so what keeps it in the wall? Is it just "force fit". Or do I need some kind of "netting" or "straping" on the non-rocked side of the wall?

knightfly · Post by **knightfly** » Sat May 17, 2003 4:43 am

Michael, you already figured it out - depending on the size of the area, you can use expanded metal (smaller area) or something cheaper (larger area)

One way that should work fine for larger areas is the SMALL mesh chicken wire. It's cheap (chicken feed :=), quick, staple-able, soft enough to conform and not resonate, and easy to apply.

Comes in several widths/lengths, just try to staple it where the twists are, so the staples aren't as likely to break the single wires.

Or :=) you could get a Super-Framus Gravity Re-Director, and just set it for 90 degrees offset...

Post by **John Sayers** » Sat May 17, 2003 9:46 am

Michael - it' just a forced fit as you suggested. Rockwool is typically made in stud width sizes, 18" (450mm) and 24" (600mm) and is made slightly larger so it's a tight fit.

cheers
john

Michael Jones · Post by **Michael Jones** » Sat May 17, 2003 10:14 am

Thanks guys.
Here, the rockwool comes in 2'x4' squares.
If you cut the four foot section, equally, 3 times, that gives you 3 - 16" strips. My studs are 16" O.C. or 14 1/2" inside to inside. I guess that'll be enough of a force fit not to have to worry about an upper square falling out.?