Roof Uplift Design

The technical bulletin below explains the design considerations such as bottom flange bracing and uplift connections at bearing.

Roof uplift design.

Design and performance requirements. The specific test that pertains to wind uplift utilizes a test apparatus designed by fm approvals. For mechanically attached single ply roofing systems the test involves building a roof assembly on a test frame that measures 12 feet by 24 feet. Design wind loads are derived using the american society of civil engineers asce standard asce 7 minimum design loads for.

To ensure a correctly built metal roof there are a variety of wind uplift tests manufacturers use to test their metal panel systems. Wind pressures on low slope roofs which is keyed to asce sei 7 16 has just been published and is available for purchase this pre. There are three tests ul 580 ul 1897and astm e1592 that are used to determine a metal roof s uplift rating. Wind uplift is a near constant force on roofs with wind movement from zero to over 170 mph.

The specific test that pertains to wind uplift utilizes a test apparatus designed by fm approvals. Wind uplift design pressures provided are component and cladding c c asd pressures acting away from the roof surface per asce 7 10 figure 30 5 1 and 2015 irc table r301 2 2. Uplift loads from the roof walls and other elements to the foundation and into the ground. In some cases wind loading can result in uplift loads on roof joists.

These uplift loads may result in stress reversals in tji roof joists and uplift reactions at bearing locations. The test frame has the appropriate roof deck attached to supports. The test frame has the appropriate roof deck attached to supports. Several rating systems have been developed to measure the stability of various parts of a roof in high winds.

Roof wind designer is intended to provide users with an easy to use means for determining roof systems design wind loads for many commonly encountered building types that are subject to building code compliance. Published august 1 2018 by whirlwind team. For mechanically attached single ply roofing systems the test involves building a roof assembly on a test frame that measures 12 feet by 24 feet. Illustrate how the load path resists wind uplift forces but a complete building design includes a consideration of numerous other forces on the load path including those from gravity loads and lateral loads.

Minimum pressures for fortified correspond to vult 130 mph with exposure c.