Standard Flat Roof Thickness

There are two types of flat roof.

Standard flat roof thickness.

The thicknesses are listed below. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. D7635 d7635m 18.

However depending on the severity of the damage and the type of material installed repairing a flat roof can cost as much as 600 800. D6878 d6878m 19. A typical flat roof repair costs at least 350 400 and involves locating sources of leaks and patching the seams or holes. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof.

Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. Flat roofs come in many shapes and sizes which include parapet roofs roof decks and green roofs to name just a few of the options available. The typical thickness range for sheathing is 3 8 to 3 4 inch. Standard specification for thermoplastic polyolefin based sheet roofing.

As the single ply roofing association spra points out this type of flat roofing is strong durable completely sealed and usually lasts at least 25 30 years. We sell a total of five roofings systems. Four are epdm membranes and the fifth is a polyurathane liquid. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Standard specification for ketone ethylene ester based sheet roofing. Manufacturers express the thickness of metal panels as their gauge with 22 gauge being the thickest and 29 gauge the thinnest of traditionally sold metal roof and wall panels. Each gauge represents a nominal decimal range. Cold roofs and warm roofs.

To support the added weight the architect or engineer may require the roofing contractor to install 5 8 inch roof sheathing. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Pvc membranes are easy to maintain and repair. Standard test method for measurement of thickness of coatings over fabric reinforcement.

1 2mm standard 1 5mm commercial resitrix.