Negative Pressure Roof System

Such a negative pressure roof system would have to be able to accommodate these positive interior pressures as well as the negative ones imposed on the top surface of the roof membrane.

Negative pressure roof system.

Some storm conditions actually cause the building interior to become pressurized such as when fenestration fails loading dock doors are open etc. When the vacuum roof is exposed to wind forces negative pressure is generated in the layer between the membrane and an airtight load bearing substrate. Negative pressure is generated and maintained by a ventilation system that removes more air from the room than air is allowed into the room. No fasteners need to be used on the roof surface so the vapour control layer is not punctured.

The negative pressure roofing system is referred to as a wind vented roof and is proven in thousands of roof installations. This makes our vacuum roofing ideal in harsh climates. Air is allowed into the room through a gap under the door typically about one half inch high. Water moisture damage within the roof turns to vapor in low pressures created by the wind vent system.

Continuous self drying of wet roofs with wind vented negative pressure system. The membrane is laid in 2 or 4 metre widths then air sealed against the parapet and around any penetrations.