My IC boxes specifically stated no closer than 2" to any joists, so I
would assume this applies the subfloor as well. If you are in a pince
you could use the compact fluorescent floods, but were the unthinkable
to happen and someone replaced the CF with an incandesent and caused a
fire you would be sorry.
I am assuming you are talking about the boxes that take the RC30 light
bulbs. Perhaps the ultra small compact lights and boxes will give you
enough clearance to prevent a serious problem.
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