Minimum Flat Roof Thickness

The problem with metal roofing gauge is that there is a wide range of tolerances.

Minimum flat roof thickness.

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 minimum slope for a flat roof is 1 4 per foot or 1 4 12 but some owners or insurance companies require a minimum slope of 1 2 per foot. You can read our article about calculating slope for information on the various roof slope notations. We sell a total of five roofings systems.

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 international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. 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. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Four are epdm membranes and the fifth is a polyurathane liquid. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. The typical thickness range for sheathing is 3 8 to 3 4 inch. Never attach roof sheathing with staples.

1 2mm standard 1 5mm commercial resitrix. Loads will vary with the. 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. Cold roofs and warm roofs.

Sheathing should be a minimum of 19 32 inch thick. 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. There are two types of flat roof. Each gauge represents a nominal decimal range.

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