Wind Uplift Test For Green Roof

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.

Wind uplift test for green roof.

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. Per approved green roof plans and design. The test is run to failure and the results are reported as the highest uplift pressure achieved prior to failure in psf. The negative pressure test utilizes a five foot by five foot dome that is placed over the roofing membrane surface.

The test frame has the appropriate roof deck attached to supports. The negative pressure test and the bonded uplift test. 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. Fire safety vegetation free border zone abutting roof penetrations intersecting walls parapets upturns or mechanical equipment is installed as required 7.

The green roof assembly must be designed to meet the 50 year event under worst case dry conditions. 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. The specific test that pertains to wind uplift utilizes a test apparatus designed by fm approvals. 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.

With the 2014 version of the csa a23 21 standard all roofing systems encountered on the market can be tested. Green roofs for healthy cities works to develop standards in support of the further development of the industry. 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. 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.

This test method is used to determine the amount of fatigue and uplift response of the green roof. The csa a123 21 14 standard is a normalized test method of the dynamic wind uplift resistance of membrane roofing systems. Wind uplift all wind uplift criteria has been incorporated and confirmed by architect or engineer. The standard also applies to wood steel and concrete decks.

The growing medium provides the majority of this weight. Fm loss prevention data sheet 1 52 fm 1 52 field uplift tests provides for two methods of testing wind uplift resistance.