Minimum Flat Roof Thickness

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.

Minimum flat roof thickness.

Ultimately a flat roof should play a part in a total architectural composition and has the ability to enhance the aesthetic and practical outcomes of a home. Never attach roof sheathing with staples. We sell a total of five roofings systems. Cold roofs and warm roofs.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Sheathing should be a minimum of 19 32 inch thick. You can read our article about calculating slope for information on the various roof slope notations. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

The thicknesses are listed below. 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. Four are epdm membranes and the fifth is a polyurathane liquid.

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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 8d ring shank nails should be used instead. There are two types of flat roof.

The typical thickness range for sheathing is 3 8 to 3 4 inch. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. For example one company might sell a product as being 24 gauge but in reality the thickness of the metal could vary from 0 018 to 0 0335 based upon exactly how that company looks at things and how big of a tolerance they allow for. The problem with metal roofing gauge is that there is a wide range of tolerances.

1 2mm standard 1 5mm commercial resitrix. Loads will vary with the.