Cooling a flat roof
Flat roof have the tendency of trapping heat. There are a few methods to reduce the heat absorption and keep your flat roof a lot cooler. This can reduce the costs with air conditioning in the summer time.
Roof coatings can be found in wide range of materials, and can help reflect as much as 90% of the solar heat. Some of the coatings can be found as elastomeric paint, polyvinyl chloride sheets, and even thin solar panels, that will also collect heat and transform in into energy.
About elastomeric paint
This paint contains some special chemicals that allow it to expand and contract along with the materials on which is applied. You can apply two coats of bright white paint and you will improve the heat reflection with 60-70%.
If the roof has a good structure, then you can install a single-ply PVC sheathing to the entire roof. Heat-welded seams will also keep the water out and will prevent wind damage thanks to the smooth texture. Some PVC manufacturers will provide roof upgrades for flashings, vents. PVC sheathings can last up to 15 years.
Photovoltaic roofing panels
Ultra-thin solar photovoltaic panels are also great for reducing the heat transfer. They will capture most of the solar energy and use it for your home, and the excess heat will be reflected.
If you can afford it, you can replace your ceiling and install a layer of solid foam insulation under the flat roof. This will improve your home’s energy efficiency.
You can also erect a low-sloped asbestos film shield over the flat roof. This will reflect solar energy, preventing the roof from absorbing it.
If you install wind catchers into the roof they may direct the cool air downwards. They are mainly used in hot climates.