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Low slope roof insulation question


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I have a 10 x 15 foot room that used to be a screened porch.  It was bricked in many years ago by a previous occupant.  The ceiling was in horrible shape.  I removed it.  Now I have 2 x 8 horizontal trusses and 2x4 supported roof deck.  

How should I insulate this before I close it back up?




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Before you decide on what/how to insulate it. For good measure, saturate the rafters and underside of that wood decking with BoraCare so that it will forever after not support any growth of fungi. It's no more dangerous than table salt - just a pain to apply because you have to keep it constantly stirred to keep the borate in suspension.

Now, as Bill said, we need to know where/what climate zone.

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