sistering floor joists to increase span
I was thinking of putting 6 of foam board on the slab the inspectors want r-30 and densepack cellulose in the ceiling. It can be ripped on a table saw and installs quickly fiberboard does have a high perm rating and may allow small amounts of moisture to pass through into the vent space.
Sistering Floor Joists Complete Guide
I use I joists for vented cathedral ceilings and staple 12 fiberboard to the bottom of the top cord of the I joists.
. I like a vented eave and ridge and have never had a problem with this assembly. So what Im looking for is the best and most cost effective way to insulate this monstrosity. And to allow for heating ducts the floor is raised about 14 on 28 joists.
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