I’m new at this forum so pardon me if this has been discussed before.
I need to insulate a narrow cavity in a CMU wall that is covered with furring and drywall. In short, the available space is nominally ¾”-1″, which is the thickness of the furring. I’ve investigated loose fibreglass & cellulose, but neither are suitable for this application. The fibreglass not filling the space properly, the cellulose providing only R-3 at best.
Existing conditions are from the exterior- 4″ brick, 4″ block, furring, drywall & plaster. There is no insulation currently installed.
I think I’ll have to use a dense (closed cell?) non-expanding foam to fill this space to provide a decent R value in the wall. With this frigid weather in the NE, the interior side of the wall is very cool, around 50°.
Can anyone suggest a source for materials and equipment to install in the existing cavity? what type of foam would this be?
Thank you for your reply.
Replies
The companies that install the spray foam, should have a pourable version. They would drill a hole at the top of the wall (inside) just below each fireblock or other obstruction and insert a hose. A cake batter like mixture would fill the bottom few inches and then expand 8' or so vertically(saw a demonstration on TOH)