After extensive research and wind testing, Hanover® is proud to announce the new and improved Ventloc® Paver. Ventloc® is the only ballast paver in the industry which enables the transfer of air pressures. Its patented design offers superior wind uplift resistance in a lightweight concrete roof paver.
Ventloc's tongue and groove design creates an interlocking roof ballast system in which an individual paver is no longer the weakest link.
Ventloc's patented venting edge enables the rapid transfer of over paver to under paver pressures. The transfer of pressures through Ventloc's vented edge has been tested and proved to provide the best lightweight paver wind uplift resistance in the industry.
When wind flows around a building, it produces high suction pressures, mainly at the leading edges. When the wind is forced over the top of a building roof’s edge, "flow separation" occurs creating a negative uplifting pressure. (See chart below.)
Wind Uplift occurs when wind flow pressures create a strong lifting effect, much like the effect on airplane wings. Wind flow over a roof creates vortices that create an uplifting force on roof components. The unique Ventloc® air transfer passageways help negate these positive and negative pressures, providing stability to the paver ballast system.
Download Hanover’s Ventloc® Brochure for more detailed information about Wind Pressure & Uplift.
Ventloc’s patented venting edge enables the rapid transfer of over paver to under paver pressures. The transfer of pressures through Ventloc’s vented edge has been tested and proven to provide the best lightweight paver wind uplift resistance in the industry.
Ventloc® was tested at Intertek ATI incorporating three different conditions - no parapet, 12” parapet, and 24” parapet – with wind speeds up to 130 mph. In all three conditions, no movement was observed.
Pressures were recorded at four different locations – top, bottom and both ends. Ventloc’s equalization was maintained at a near zero value from the top surface to the underneath side of the paver, clearly demonstrating that the vents are transferring pressures. Refer to Ventloc® Test Report 11.4.15. Ventloc’s ability to equalize pressures, along with its true interlocking design, provides a much more wind resistant installation than pavers without vents.
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