Our old farmhouse has an unenclosed porch that is roofed with what
looks like 2x6 from underneath, then has a metal roof on top. The
metal roof is in bad shape so we are going to put on a shingled roof.
Some of the baords need to be replaced, but after that, is it
necessary to use OSB, since the roof will be solid, or can we use 30#
felt to hide any possible small uneven places and then do the
shingles? I even wonder about using a double layer of felt. It just
seems like overkill to use the OSB, especially on an unenclosed porch,
but I don't know how well the felt can level things out.
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