OT, roof insulation question - Page 2
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  1. #21
    Join Date
    Aug 2012
    California, Central Coast
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    I think that the best thing to do is replace the insulation with rigid foam which is the easiest way to increase R-value, so important with only 4" of insulation, leaving an air channel for venting. Reroof as normal at that point. This will preserve all interior finishes, not change the height of the roof so all shingles will line up without problems. The only barely noticable difference would be the slight profile change of the ridge vent. That should be added to the entire ridge(s) and eves of the house at the same time. Anything more will probably be opening a can of worms. I would be hesitant to any new weight to a 2x6 rafter roof. Not sure what engineers, building dept, etc do in N.Y. but here if you wanted to do something to add weight to a sub standard roof you would be reframing roof with larger rafters.

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