Above Sheathing Ventilation
Discover how our double-strapped roof deck reduces heat transfer by up to 45% and saves significantly on energy costs year-round.
A double strapped Eco Roof with above sheathing ventilation converts heated air from the sun's radiant energy into convective energy that ducts heated air up to a concealed ridge vent system.
How ASV Works
Traditional asphalt shingles and directly-applied metal panels absorb the sun's intense radiant heat, transferring it directly into your attic and living spaces. Above Sheathing Ventilation (ASV) breaks this thermal bridge.
By utilizing a double-strapped system (vertical and horizontal battens), we create a continuous 1.5-inch air gap between the metal roofing panels and your roof deck. This continuous airflow naturally channels hot air from the eave to the ridge, venting it out before it ever reaches your home's interior.
Thermal Buoyancy
As air heats up under the metal panels, it naturally rises (thermal buoyancy). This draws cooler air in through the soffits and eaves, creating a continuous upward flow that exhausts hot air out the ridge vent.
Moisture Control
The continuous airflow prevents condensation from forming on the underside of the metal panels, keeping your roof deck completely dry and eliminating the risk of mold and rot.
The Science Behind the Savings
Oak Ridge National Laboratory Study
"We found that elevating the roof cover from the roof deck to induce above-sheathing ventilation is as important as increasing solar reflectance and may be the stronger player in reducing heat gain into the attic. The two combined can reduce heat gain through the roof by 50% compared to nailed asphalt shingle roofs."
Real-World Energy Savings
The combination of a reflective BeckryTech™ coating and Above Sheathing Ventilation produces dramatic results in summer cooling costs. Homes in the Ottawa area experience intense solar radiation during July and August, leading to excessive air conditioning usage.
Less Heat Transfer
Compared to traditional asphalt shingles nailed directly to the roof deck.
Lower Cooling Costs
Average reduction in summer air conditioning bills for standard single-family homes.
Winter Performance & Ice Dam Prevention
ASV isn't just for summer cooling. In winter, this same air gap acts as an insulating thermal bridge. It reduces heat loss from your home to the cold night sky, keeping your house warmer and more comfortable.
The End of Ice Dams: Ice dams form when heat escaping from your attic melts the snow on the roof, which then runs down to the cold eave and freezes. By maintaining a continuous flow of cold outside air between the metal roof and the deck, ASV keeps the entire roof surface at a uniform, cold temperature. This prevents the freeze-thaw cycle that creates devastating ice dams and icicles.
Ottawa Winter Ready
Our double-strapped installation method is specifically designed for the heavy snow loads and extreme temperature fluctuations typical of the National Capital Region.