My house is hot in the southern United States. Trying to add insulation in the attic space during the summer almost killed me last year. The attic was so unbelievably hot. I have developed a roof leak and was thinking about a metal roof on top of my current roof. I was wondering why a metal roof can’t be installed on braces a few inches above an existing roof to function as a roof and shade. The airflow between the two would have to cool the attic, much better than if the heat radiated through straight to the shingles and plywood. We bought a sunshade for our back patio, and I’ve thought about even something as simple as that over smaller homes could drastically help.
In: Engineering
My house has this. It’s called a Snow roof. We live in an older double wide mobile home and the people who installed it also put a pole building around it with a steel roof. It’s designed to take a heavier snow load than the mobile can take.
The gap between the mobiles roof and the snow roof works exactly as you described in the 110° heat we’ve been having. It creates air movement across our roof and keeps the sun from hitting it directly. We can usually keep the inside of the mobile 20° to 30° cooler than the outside temperature without AC. These are pretty common around here for mobiles installed in the 80s.
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