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I built a deck with a covered metal roof. We absolutely love it but have noticed it gets considerably hotter under the roof then it does out in the yard. Missing the entire point of having the covering to begin with. Even with our new outdoor ceiling fans turned on it's too hot. The sun beats down on the metal roof and it seems to act like an oven that just radiates heat underneath it.
If you are on the deck looking up you can see the exposed joists, perlins and sheet metal roof. I am wondering if I were to install a "ceiling" on the underside if that would help? For instance I am thinking of buying those sheets of 4x8 pink foam that has the reflective foil on one side and screwing it up there (foil side up) across the underside of the joists. That would also leave a 6" air gap between the metal roof and the foam (thickness of the joists) and would act like a chimney for warm air to move up between them (It's a shed style roof).
My thought process is that this would reflect the heat back up rather then down and allow air to flow between the two. Thereby removing the whole metal-roof-oven-effect.
Would this work? Any better ideas? We want to enjoy our covered deck!
Well, our barn has a metal roof, and it is insulated underneath. No gap - just right up against the roof. It does stay cool inside in summer. It also keeps it from getting drips from condensation that can happen when it's not insulated.
The deck roof is completely open air and not tied to the existing house. Just think of it as a suspended shed style roof sitting on 6x6's over a deck. Air is free to move underneath it.
I think I'll try adding the reflective sheet foam. It's not that expensive so if it does not work not out much $$$ or time.
I'm guessing that the roof is heating up and the infrared heat is what you are feeling, so you are on the right track with blocking it.
The pink foam will work, but without seeing the rafters exactly (have an idea as a standard gazebo truss), I would suggest a wooden covering to hide the foam. Vent screens on the bottom, with a ridge vent something at the top.
Ceiling fans will just blow the hot air down. You need some form of insulation
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