Wind Uplift Test For Green Roof

The most advanced wind tunnel wind uplift tests are being conducted at the nrc s dynamic roofing facility in ottawa canada using a chamber fan mechanism that simulates the dynamic effects of wind.

Wind uplift test for green roof.

Working in close partnership with spri design guidelines approved by the american national standards institute ansi have been developed for fire wind uplift and root repellency. Per approved green roof plans and design. Fire safety vegetation free border zone abutting roof penetrations intersecting walls parapets upturns or mechanical equipment is installed as required 7. Many institutes have been performing wind tunnel tests on green roofs and canada is the first country to employ a standard method for testing wind uplift on vegetated roofs.

The test is run to failure and the results are reported as the highest uplift pressure achieved prior to failure in psf. Utilizing a test chamber this test is conducted by either pulling a vacuum above the assembly or by pressurizing an air bag placed loosely between the deck and the roof covering. Green roofs for healthy cities works to develop standards in support of the further development of the industry. The negative pressure test utilizes a five foot by five foot dome that is placed over the roofing membrane surface.

The zinco green roof systems are extremely flexible in design and installation and can be tailored specifically to the wind uplift calculation require ments of you green roof project. The most advanced wind tunnel wind uplift tests are being conducted at the nrc s dynamic roofing facility in ottawa canada using a chamber fan mechanism that simulates the dynamic effects of wind. Fm loss prevention data sheet 1 52 fm 1 52 field uplift tests provides for two methods of testing wind uplift resistance. 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.

The specific test that pertains to wind uplift utilizes a test apparatus designed by fm approvals. The test frame has the appropriate roof deck attached to supports. The growing medium provides the majority of this weight. The purpose of this test is to gain uplift resistance data for the panel assembly and evaluate the attachment of the roof covering systems to the roof decks.

Many institutes have been performing wind tunnel tests on green roofs and canada is the first country to employ a standard method for testing wind uplift on vegetated roofs. The green roof assembly must be designed to meet the 50 year event under worst case dry conditions. To test for wind pressure a full scale uplift chamber evaluates the ability of a vegetated roof assembly to resist a series of simulated wind gusts where pressure builds and subsequently drops. With the 2014 version of the csa a23 21 standard all roofing systems encountered on the market can be tested.

The csa a123 21 14 standard is a normalized test method of the dynamic wind uplift resistance of membrane roofing systems. The negative pressure test and the bonded uplift test.