Roof Paint Sun Absorb

The team s lab measurements show.

Roof paint sun absorb.

Cool roof coatings are white or special reflective pigments that reflect sunlight. When it s cold they turn black and absorb heat just when it s needed. A flat roof in the midday sun receives about 1 000 watts of sunlight per square metre. In the above chart look at how much energy makes the earths surface in the visual spectrum range.

There are many types of roof systems available but the surface exposed to the sun is the one that determines if a roof is cool or not. Paint is an affordable flexible option for changing the look of a shingle roof that s in good condition but could use some aesthetic improvement. The best way to go when it comes to painting your roof neal says is to use a white urethane or silicone coating to drastically reduce the amount of heat being absorbed in fact a 2011 study published in the journal of climate reveals that painting a roof white does reduce summer air conditioning costs although on a large scale it may actually slightly increase the earth s overall temperature. You can usually make a new or existing roof cool by selecting the appropriate surface.

Carbon pollution reduction from cooling down roofs and walls in our city environments is a real way to reduce the urban heat island effect caused by buildings absorbing the sun s radiation then re radiating that heat after the sun goes down. A dark roof will absorb the sun s warmth in spring and autumn when the surface isn t covered with snow. Coatings are like very thick paints that can protect the roof surface from ultra violet uv light and chemical damage and some offer water protection and restorative features. The tiles become white when it s hot allowing them to reflect away most of the sun s heat.