Venturi Effect Vacuum And How it Works

V2T Roof System uses the power of the wind to hold the roof securely in place. The technology behind the vent is based on a recognized physics principal called “the venturi effect” to create a vacuum that becomes stronger as the speed of wind increases. The vacuum pulls the air from under the membrane – drawing it down to the deck and holding the membrane firmly in place. Destructive uplift pressures are counteracted by a greater vacuum force created by the vent.

chart of wind speed vs. negative pressure

The stronger the wind blows, the tighter the roof holds.


Let the Wind Work for Your Roof

What makes the V2T Technology so unique?

The V2T Roof System is different from existing roof vent devices because it uses the Venturi Effect Vacuum principle and the design of the patented vent to hold roof membrane securely in place. The vent captures the dynamic flow of air across the roof’s surface to generate low pressure.

And, because the V2T Roof System uses a loose laid membrane, it is the fastest, easiest, and most environmentally friendly roof system to install or repair.

The vent works with the effects of the wind instead of against it.

Other significant features of the V2T Roof System include:

  • The V2T vent is manufactured from a rigid plastic material that is strong enough to resist excessive wind speeds, yet lightweight enough for ease of handling and installation.
  • The V2T contains no moving parts, and is made from UV resistant PVC.
  • Use of the V2T reduces installation time and minimizes the need for traditional fastening methods.
  • The unique shape of the V2T allows it to perform effectively with any wind direction.
  • V2T patented technology is the only one of its kind in the world.

Venturi Effect Vaccum V2T Vents For Stronger Commerical Roofs


The Drying Effect

Benefits of the V2T Venturi Effect Vaccum Roof System
The V2T Roof System has many valuable benefits including the price, being a ‘green’ technology, and offering quicker installation and in less than perfect weather. However, one often discussed benefit of the V2T vent is its ability to pull both air and moisture out from under a membrane.

Why is the Drying Effect Important?
Moisture may penetrate into a low-slope roof assembly in a variety of ways including, surface leaks as well as from condensation created from inside the building, among others. Moisture trapped in a roof assembly can not only cause significant damages to the roof and interior spaces beneath it, but also to the building as a whole. This damp environment caused by leaks also encourages mold growth, an increasing issue in many buildings. In the United States, moisture approximately lead to a 40% overall reduction of the R-value of insulated roofing insulation (Kyle and Desjarlais 1994). The extreme degradation of the insulation’s thermal resistance may increase energy loss through building roofs by 70% (Desjarláis and Byars 1998) and may increase peak electrical demand for preconditioning by 15% (Kyle and Desjarlais 1994). According to Desjarlais and Byars, moisture has been a major cause of re-roofing in the United States, which accounts for 75% roofing work, and has become a multibillion dollar problem in the roofing industry.

How Does the Drying Effect Work?
The V2T Roof System uses the power of the wind to create suction between the roof membrane and substrate( venturi effect)  – the stronger the wind blows, the tighter the roof holds. This suction increases the potential for removal of moisture from the roof system.

Essentially, the vents create a vacuum effect where the air passing through the vents above the membrane actually pulls what is under the membrane up, and the membrane down. When applied to a semi-permeable sub-roof, in addition to resisting membrane detachment, the vent can act in a moisture drying capacity. Moisture is pulled from insulation and from any possible ponding locations that may be forming under the membrane.

The V2T Roof System uses a new, patented vent system developed in collaboration with researchers at Virginia Tech for application to low-sloped roofs for either replacement or new installations. It is important to note that maintenance of traditionally adhered roof systems can also use V2T vents to help pull moisture from the membrane and insulation. Just using a vent where there is a leak will help extend the life of the roof before the next re-roofing is needed.

The V2T Roof System and monitoring technology are a great asset for any roof. Whether you are looking to re-roof, or construct a new one, V2T can work with you!

Learn more about The Drying Effect of The Venturi Effect Vacuum Vents

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