insulation under metal roof

Raymond Abel
8/16/2013
I plan on adding a metal roof over my 20 year old existing asphalt shingle roof. The roof is still in pretty good shape, but I don't want to wait until there is a problem to replace it. I have an attic with gable vents with a power fan on one end that is activated by both a thermostat and a humidistat. I have been told that adding styrofoam panels between the battens will help keep my attic cooler in summer, saving on air conditioning. The cost of the styrofoam is fairly cheap. Is this really a good idea and will it in any way cause any harm to the house or the new roof? Raymond. P.S. Thanks for providing this forum.
Todd Miller
Isaiah Industries, Inc.
8/16/2013
Thanks Raymond. I assume that you're adding a metal roof which can be installed on battens. In that case, don't discount the value of a thermal break achieved by a dead airspace or a vented airspace. Putting in some insulation would help as well but I would not entirely eliminate the airspace.
Eric Novotny
An informed customer is the Best Customer!
8/16/2013
For what its worth, the vented space would probably work just as well. The bottoms (at the eave) will have to be open as well as the ridge.

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