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You should look into green roofs. You plant grass on your flat roof (using a special system). It retains run off water and helps to cool the house in summer and heat it in winter.
You may not have a big enough flat part of your roof to make a diffference though.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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