Hot Flat Roof Construction

The sandwich warm deck roof is the most common type of flat roof.

Hot flat roof construction. Also known as the built up roof bur this type of flat roof features three or more layers of waterproof material mixed in an alternating fashion with hot tar and a layer of smooth stone like gravel. How hot roofs differ from traditional roofs. The most important thing to know about a flat roof says tom is that it s not flat to prevent water from pooling and eventually invading the home flat roofs are always built on a slight incline at least 1 8 inch per foot. While there are many variations there are two popular options used to create a hot roof.

Because flat roofs require specialized materials and construction methods any roofer you choose to work on yours should have a large resume of past work on flat roofs. Many slope in several directions like squashed hip roofs toward scupper holes that connect to downspouts. Built up roof bur the traditional hot tar and gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone. The first method revolves around foam sprayed in place generally sprayed in between the rafters trusses while the second utilizes foam board generally placed on top of the exterior roof sheathing.

Cool roof rating council the cool roof rating council crrc is an independent organization that developed a system for providing building code bodies energy service providers and architects specifiers with accurate data about roof surfaces to help improve the energy efficiency of buildings. Attics typically have an insulated floor and have ventilation. As you might imagine this is the cheapest version possible and good for covering a shed. This method is intended to deter ice dams by keeping the roof cooler.

Once made of tar paper these types of roofs gradually are using more advanced materials such as fiberglass membranes. Inverted warm deck roof. Air from outside is permitted to come in through the soffits and exit through the top of the roof which creates a cold attic during the winter months. Pvc membranes are easy to maintain and repair.

The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.