Minimum Flat Roof Thickness

Loads will vary with the.

Minimum flat roof thickness.

Cold roofs and warm roofs. We sell a total of five roofings systems. Four are epdm membranes and the fifth is a polyurathane liquid. 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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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. Each gauge represents a nominal decimal range.

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

Sheathing should be a minimum of 19 32 inch thick. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Never attach roof sheathing with staples. 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. You can read our article about calculating slope for information on the various roof slope notations. 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 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.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The typical thickness range for sheathing is 3 8 to 3 4 inch.