Minimum Flat Roof Thickness

Sheathing should be a minimum of 19 32 inch thick.

Minimum flat roof thickness.

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

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. Never attach roof sheathing with staples. There are two types of flat roof. We sell a total of five roofings systems.

8d ring shank nails should be used instead. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch.

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. 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. Cold roofs and warm roofs. The problem with metal roofing gauge is that there is a wide range of tolerances.

Each gauge represents a nominal decimal range. 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. You can read our article about calculating slope for information on the various roof slope notations.

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. 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.