How can a roof cool a house?
Have you ever went into an attic during the hottest part of the day in the summer time? It can get so hot that a person could over heat and pass out! That heat radiates down from the attic, through the ceiling and heats up the main living area of your house causing the air conditioner to work harder. Wouldn’t it be amazing if there was a way to keep all that excess heat from reaching the living areas or even into the attic in the first place?
Of course there is! Its called a Cool Roof design. No, it’s not considered cool because it works really hard without using any moving parts and electricity or even looks amazing. The cool roof design helps to keep the roof’s temperature cool even in a tropical or desert climate. Also, this design actually blends into the house design and most people wouldn’t even notice that it was even there unless the builder and/or owner pointed it out. I think these are great reasons to consider it “cool.”
Essentially, the cool roof design is similar to the way the Passive House walls are designed but with a little twist. It’s like have a roof built on top of the roof but instead of using lots of insulation, the cool roof uses an air gap and then moving the air through the gap as the insulation. The metal roof on top doesn’t touch the struts or decking of the roof and attic. This is how the air flows in between them. Since less than 1% of the roof will make a thermal bridge from the metal panel on top to the decking, very little heat is conducted. Convection, similar to the way smoke travels up and out of a chimney, makes the air between the metal roof and the decking to rise and escape out the ridge vents. No need for fans or any other manual means of circulating the air since it does this action naturally.
This isn’t just a design that would be helpful for buildings built in the desert. This technology could be used for any building any where that uses air conditioning to cool their homes during the summer months. This would definitely help out on the electric bill by saving the air conditioning and/or fans from running all day.
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