We are building a covered deck with that is screened in (will use a vinyl window system to also enclose it). The roof is asphalt shingles supported by rafters. The roof will be ridge vented with under eve vent panels. On the interior, the rafters will be finished out with T&G paneling. My question is: would installing foil covered rigid insulation between the rafters be worth it. i.e. would it minimizing the heat radianting into the interior from the roof? If so, would you install next to the sheathing or just above the T&G paneling?
Thanks,
Replies
yes, it will reduce your heat gain from the roof.
Definitely leave a airflow channel under the sheathing so you have free airflow from the soffit vent to the ridge vent. That will carry a lot of heat out
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Generally, agree w/ Piffin. What is your location? If you aren't heating or cooling the porch, are you simply trying to minimize the summer heat gain? If that heat gain is significant, yes, the insulation will help the comfort. And you would install it nearest the finished ceiling, not at the roof sheathing.
If your roof is well shaded by a tree(s), there may be little heat gain from the sun ... the insulation would benefit you MUCH less in that kind of a situation.
We are in Maryland with roof on the west side of the house. No tree cover - full bore sun all afternoon long. Those that built decks in the neighbor hood on the same side of the house as ours, don't use the deck unless its covered and screened. The bugs and sun make it unpleasant.
Thanks for the input