Adding interior insulated walls

warmwxrules · 02-03-14, 10:24 AM

I have an idea to add interior 2x4 stud walls (basically a double stud wall) with a 2 inch gap filled with R23 mineral wool (24oc). The walls are plaster (painted). No insulation in the exterior stud cavity (2x4) currently-- I would dense pack cellulose from the outside.

Can i leave the painted plaster wall in place? I guess i could rip the currently walls out and just extend the studs and dense pack the whole cavity with cellulose from the inside, but that seems like a lot of work/mess.

I like the idea of mineral wool because i do deal with some road noise (excellent for noise). I would only do the 3 bedrooms to begin with. The entire house (1story ranch) would get the dense pack cellulose.

Thoughts? Anyone ever do this? What about the gap that will be (2 inches) behind the studs...do i fill this somehow?

02-03-14, 10:24 AM	#1
warmwxrules Helper EcoRenovator Join Date: Nov 2011 Location: La Crosse, WI Posts: 78 Thanks: 0 Thanked 3 Times in 3 Posts	Adding interior insulated walls I have an idea to add interior 2x4 stud walls (basically a double stud wall) with a 2 inch gap filled with R23 mineral wool (24oc). The walls are plaster (painted). No insulation in the exterior stud cavity (2x4) currently-- I would dense pack cellulose from the outside. Can i leave the painted plaster wall in place? I guess i could rip the currently walls out and just extend the studs and dense pack the whole cavity with cellulose from the inside, but that seems like a lot of work/mess. I like the idea of mineral wool because i do deal with some road noise (excellent for noise). I would only do the 3 bedrooms to begin with. The entire house (1story ranch) would get the dense pack cellulose. Thoughts? Anyone ever do this? What about the gap that will be (2 inches) behind the studs...do i fill this somehow?