Why your roof requires an uplift test

Why your roof requires an uplift test

-Because it’s a code requirement-

Roof monitoring during construction is an important element of a successful roofing installation. So important, there are requirements to obtain in-progress and final inspections from a city inspector. However, when necessary field uplift testing is a viable tool to help determine a roof system’s ability to withstand potential wind events.

First, you must understand the meaning of wind uplift. Wind uplift is the suction created by wind forces as the air moves parallel to the roof’s surface. Roof damage caused by wind occurs when the air pressure below the roofing assembly is greater than the air pressure above the building’s roof. As wind flows over the building, the pressure directly above the surface of the roof decreases. At the same time, internal air pressure increases due to air infiltration through openings, cracks, etc. The result is a net upward force on the roofing system. The faster the wind, the more forceful the uplift will be. In extreme wind events, uplift can pull tiles and shingles off buildings.

Keep in mind, wind uplift pressures vary depending on the location on the roof, meaning not every point on a roof experiences the same uplift pressure at the same time. The roof corners and perimeter are the weakest points. The type of roof you have also plays a large role. For example, gable roofs are one of the most popular roofs available. However, they are more susceptible to collapsing or being torn off the house if the overhang is caught by an updraft.

There are two types of uplift tests, TAS 106 Tile uplift test and TAS 124 bell/bonded pull test. A tile uplift test is a product application quality control test to confirm adequate bonding by the mortar or adhesive to the tile and underlayment or mechanically attached tile roof systems. A direct tensile load is applied by pulling up on the edge of the tile by using a tile testing scale, this test verifies the tile can withstand the uplift it is designed for. These tests are mandatory in Miami-Dade and Broward County due to the High Velocity Florida Building Code requirements.

The TAS 124 test determines if the flat roof can withstand the vacuum pressure caused by a hurricane. There are two methods to determine this, a Bonded Pull Test for a fully adhered roof and a Bell Chamber Test for a mechanically attached roof. For a Bonded Pull test a 2’x2′ panel is glued to the roof and pulled with a Com Ten to the calculated value. For a Bell Chamber test a 5’x5′ vacuum chamber is applied to the flat roof and the vacuum is raised to the calculated value. This is usually performed when a roof recovery is proposed to ensure the existing roof meets the required resistance pressures of the roof system assembly.

If you need an uplift test or want to complete some routine maintenance, Aruba Permit Services and our team of engineers are ready to assist! Contact us today and our team will complete the required testing to ensure your roof meets the minimum wind resistance pressures. Along with our partner, Aruba Construction & Roofing, Inc. we can replace your roof or complete any repairs your roof may need.

Call today for your FREE estimate!

Contact us!

Visit our website: Aruba Permit Services
Phone: (954) 786-7292
Email: info@aruba-services.com
Address: 1130 S. Powerline Road, Pompano Beach, FL 33069

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