rigid foam ins as vibration isolation?
Posted: Fri May 21, 2004 12:39 am
Hey guys! This one is more for Knightfly and Rod I guess...
When using concrete block as an outer envelope wall, heat transfer is going to be a concern of mine. Even tho I'll have fiberglass blanket and plenty of 703 on the inside of the rooms for acoustic treatment, I'd like to have an insulation layer around the envelope of the building.
The easiest thing to do would be to put an inch or 2 of extruded foam insulation on the inside of the concrete blocks. No acoustic value, but good for heat loss. My question is how to relate the remaining construction inside to this foam. At first I left a 2" gap between this foam and the interior floated floors and stud walls, but I'm wondering if that gap is necessary.
The foam won't structurally couple the inside walls to the block, so that's not an issue- and since it has zero acoustic value, I'm wondering if I could just count the insulation as filling a 2" gap between the inside and outside walls.
Is that a bad idea? Will it change the walls into a single-leaf system? (I'm using inside-out wall design, so the drywall would be pressed up to the rigid foam) Or will the foam not allow the air gap between the 2 leaves to act as the spring it's supposed to?
Thanks in advance
Kase
www.minemusic.net
When using concrete block as an outer envelope wall, heat transfer is going to be a concern of mine. Even tho I'll have fiberglass blanket and plenty of 703 on the inside of the rooms for acoustic treatment, I'd like to have an insulation layer around the envelope of the building.
The easiest thing to do would be to put an inch or 2 of extruded foam insulation on the inside of the concrete blocks. No acoustic value, but good for heat loss. My question is how to relate the remaining construction inside to this foam. At first I left a 2" gap between this foam and the interior floated floors and stud walls, but I'm wondering if that gap is necessary.
The foam won't structurally couple the inside walls to the block, so that's not an issue- and since it has zero acoustic value, I'm wondering if I could just count the insulation as filling a 2" gap between the inside and outside walls.
Is that a bad idea? Will it change the walls into a single-leaf system? (I'm using inside-out wall design, so the drywall would be pressed up to the rigid foam) Or will the foam not allow the air gap between the 2 leaves to act as the spring it's supposed to?
Thanks in advance
Kase
www.minemusic.net
