I've got a portion of a roof built with 2x4 rafters. I'm trying to
stuff R30 in the space with some airspace-savers underneath, which
would normally warrant 2x10's instead. What would be the best way to
build these 2x4's out to the depth I need for my insulation? Running
2x10's next to the 2x4's would be annoying, but is the only answer I
can come up with. Any suggestions? Any possibility of getting away
with 2x6's attached to the face of the 2x4's? Thanks for the advice!
I'm not 100% sure I understand your problem but a few comments, just
If you are insulating an attic and you are not planning to occupy it,
the easiest solution is to put the insulation on the "floor". If you
are going to make living space, only then do you need to worry too
much about having something to nail to.
If you are "stuffing" insulation where the roof meets the walls, it is
probably better to cut out some of the insulation. A smaller amount
of insulation tha is "fluffy" is better than a lot that is compressed.
I don't understand why you need to add wood to add insulation. The
insulation doesn't have to be between anything. Just put 3.5-inch
insulation between the rafters, then run more across (assuming you are
using roll fiberglass) over the rafters, holding it in place with
lightweight wire or some such. I also wonder if you mean rafters or
joists. -- H
guys, thanks for the answers. this is a cathedral ceiling, so the
insulation will have a very small space between the ceiling and the
roof decking when all is said and done. the rafters (they are rafters
if they hold up the roof decking right?) are only 2x4's but now i plan
on attaching 2x6's using some kind truss plates to provide enough
space for R30.
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