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Ecological Roofs

A good roof will keep the building cooler thereby reducing how much energy is needed to cool the building and cut your heating bill.

White Roofs

White reflects sunlight and therefore white materials heat up less than dark surfaces.  The attics of houses with black asphalt shingles and apartments under flat dark asphalt coated roofs heat up in the summer because of this absorbed heat. 

white roof
A white roof is especially useful in Lotan's desert climate where the sun is shining most days of the year.

Painting the roof white or choosing light colored roofing materials significantly reduces the heat transferred into the house.

Shade Roof

Shading the building with a good roof keeps it from heating up more than the ambient outdoor temperature.  A shade roof works like a wide umbrella, keeping the sun off the building when it is overhead.

vented
A ventillated air gap between the roof and the building significantly reduces heat gain from direct sun exposure.

In order to keep the heat accumulated by the roof material to be transferred to the building, the roof needs to be well ventilated.

Shade roofs can be made from natural materials like thatch and palm leaves.  Clay tiles have been used for thousands of years.  Sheet metal (standing seam) roofs, painted or galvanized, are often formed from recycled metal from cars and are lightweight so they need minimal structures to support them.

Shade roofs double as rain protection and can serve as rainwater collection systems.

Insulated roofs

Many houses have insufficent insulation in their ceilings. This leads to heat gain in the summer (especially if the roofing is dark and not ventillated) and heat loss in the winter. Adding interior ceiling insulation is a very cost efficient way to cut heating and cooling costs. Many ecological insulation materials are marketed today. Exterior green roofs - planting a rooftop garden in a thick. lightweight and well drained bedding material - has been used for centuries and have the added benefits of reducing rain runoff and taking carbon dioxide out of the atmosphere.

 


Contact Lotan Center for Creative Ecology
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Tel: +972 8 6356935; +972 54 9799030
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Creative Commons License
This work by Center for Creative Ecology, Kibbutz Lotan is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Based on a work at www.kibbutzlotan.com.