Cantilever insulating

I would stuff a few inches of Roxul in each bay, make it tight, mostly to keep insects away. Then the foam boards with sealed edges (either spray foam or weatherized foil tape). Then I would try to cover the whole thing with a wire fence material (preferably with small holes and rust resistant) to make sure no squirrel ever gets in there.

Sounds like a good plan. Just make sure the insulation travels into the bays into the living area a few inches to give you more insulation. Air sealing is very important then as you don't want this to be a place to lose heat, air conditioning or letting moist air in or out. Unless you think the house design needs it. But it looks like the builder just overlooked this section.

I would do the Roxul R23 and cut additional strips of 1.5 inches to fill the gap. Make sure it is nice and tight. You could do the same with Fiberglass, but it is trickier to do as you don't want to compress the fiberglass too much.

Haha..Good idea.

But I was going to suggest spray foam the entire damn thing.

Roxul has gone up significantly in price in the past 7 years here.

Andrew

I was thinking Roxul R23 is 5.5 thick so you could cut 1.5 inch thick pieces on the flat side to get to 7 inches or so. Maybe 1.75 to give you a little compression top and bottom. Roxul is easy to cut with a bread knife. But I also like the new fiberglass products they have, so go with that if you like it better. Either one will do.

I am sure you are fine, but inspect inside the bays as you go along looking for any surprises like water damage, mold or anything else you might want to address before you close it up.

Really nice work. A bag of Roxul around here is $50, so altogether you probably spent $150 in supplies to save money in the long run. Smart choice.

Congrats.

Wow, good thing you found and insulated that pipe.

Good job, again.

cableman said:

Ripped a section of the back cantilever, unreal how crap was insulated back then. Great stuffed 2" dow board on top plate and Ill finish this off with roxel also.

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Sad but have seen it before ... unless you are onsite watching the build or doing it yourself, short cuts can happen. Not every contractor is diligent in getting quality help.

The insulating you are doing should make a big difference in comfort and prevent potential freeze disasters.