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mincus · 02-11-13, 07:37 PM

MN: You live in minneapolis and only have 7 inches?!? Woah!

Not ready to replace the siding, so I didn't want to do the foam on the outside. The house is pretty big, so new siding would add a huge cost to the project.

Blue: I've looked into the mooney wall, and think it's a great concept.

I really like the idea of taking out existing fiberglass, and doing a couple inches of foam on the back, against the outer wall. This would give me the airtight seal, but leave room for cellulose or fiberglass. That would only leave me about 5 inches to blow in cellulose. Would I be able to pack it well with only 5 instead of 7 inches? I know you dense pack it, but does anyone worry about settling over time? It looks like in the mooney wall they have a depth of around 5 inches. Do the horizontal 2x2's in the mooney wall help to prevent it from settling? I don't want to do all this just to realize there's not insulation in the top foot a few years down the line!

hamster: So, do you dense fill with cellulose on top of your spray foam? If you put in 4 inches of spray, how many inches of cellulose do you have?

Thanks for the ideas guys. I'm starting to narrow down my options!

02-11-13, 07:37 PM	#7
mincus Helper EcoRenovator Join Date: Feb 2009 Location: St. Louis, MO Posts: 42 Thanks: 0 Thanked 0 Times in 0 Posts	MN: You live in minneapolis and only have 7 inches?!? Woah! Not ready to replace the siding, so I didn't want to do the foam on the outside. The house is pretty big, so new siding would add a huge cost to the project. Blue: I've looked into the mooney wall, and think it's a great concept. I really like the idea of taking out existing fiberglass, and doing a couple inches of foam on the back, against the outer wall. This would give me the airtight seal, but leave room for cellulose or fiberglass. That would only leave me about 5 inches to blow in cellulose. Would I be able to pack it well with only 5 instead of 7 inches? I know you dense pack it, but does anyone worry about settling over time? It looks like in the mooney wall they have a depth of around 5 inches. Do the horizontal 2x2's in the mooney wall help to prevent it from settling? I don't want to do all this just to realize there's not insulation in the top foot a few years down the line! hamster: So, do you dense fill with cellulose on top of your spray foam? If you put in 4 inches of spray, how many inches of cellulose do you have? Thanks for the ideas guys. I'm starting to narrow down my options!