You could insulate this and, if you do, I would suggest a closed cell spray urethane foam system. Other insulations, especially if not done with a solid vapor barrier, could trap moisture against the bottom side of the roofing which would be harmful.
I will say this though ... my suggestion for your climate is to ventilate the attic as much as you can and then add insulation on top of your ceilings rather than beneath the roof.
Todd Miller
2014-06-05 09:55:34.000000
I have a 30 year old house with a metal roof. There is no plywood decking. There is insulation on the floor of the attic, but not on the metal roofing itself. Is this correct, or can I insulate the underside of the metal itself? I can't tell if there was insulation next to the metal originally and has fallen away over the years due to some water leaks and repairs. Please advise.
Janet Field
2014-06-05 09:38:05.000000
Janet,
If the roof is currently vented (i.e. the attic is not a conditioned space nor used as one), don't bother. Leave it as is and use a proper roof with the right emissivity for your area and climate.
Make sure the insulation is up to R-50 and air seal the attic floor.
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