The ARMA Asphalt Roofing Ventilation Task Force acts as the voice of the roof ventilation community to identify the sound theory and scientific data supporting roof ventilation.
The 2015 International Residential Code and International Building Code, published by the International Code Council, include requirements for attic ventilation to help manage temperature and moisture that could accumulate in attic spaces. Although the code requirements are understood to apply to habitable buildings, not everyone understandes how the code addresses accessory structures, like workshops, storage buildings, detached garages and other buildings. What's the answer? The code treats all attic spaces the same, whether the space below the attic is conditioned or not...
Read the full article: pdf Attic Ventilation in Accessory Structures (2.54 MB)
What’s a residential roofing contractor to do if he knows his potential customer’s attic needs better ventilation (or ventilation period!) but the homeowner disagrees? What if the contractor’s proposal to replace the roof and improve the attic ventilation puts his price tag significantly above the other estimates in the homeowner’s hand? And what if the homeowner is willing to pay for the improved attic ventilation but challenges the roofer’s proposed game plan for venting the attic?
Read the full article: pdf Selling Attic Ventilation to Homeowners (353 KB)
For residential roofing contractors, there are multiple excellent reasons to conduct an attic-ventilation inspection — as long as it’s safe and practical to do so. Perhaps none of them carries more weight than this bottom line perspective from Sam Rosario, president of Liberty Construction Inc. in Worcester, Mass. “The value of inspecting an attic is critical to my business,” he said. “We will use it against all other contractors who don’t do an attic inspection. ‘Would you trust a doctor who doesn’t examine a patient yet recommends surgery?’ we ask homeowners.”
Air Vent asked attendees of its Attic Ventilation: Ask the Expert™ seminars (offered free to the residential roofing industry every first quarter) to pinpoint specifically what they look for during attic-ventilation inspections and why; how homeowners react to the inspections; and to explain the impact the inspections have on their businesses.
Read the full article: pdf Standing out in a Crowded Market - The Benefits of Attic Inspections (230 KB)
Good news, roofing contractors: You do not have to be good with numbers nor do you have to enjoy math to be able to quickly—and accurately—calculate the amount of attic ventilation needed for residential attics. Here it is, a handy shortcut for quick calculations:
Attic square footage ÷ 2 = square inches of EXHAUST and square inches of INTAKE Net Free Area (NFA) needed. (NFA is the unobstructed area through which air can pass through a vent, usually measured in square inches. Ventilation manufacturers assign an NFA value to the non-motorized vents they make.)
This shortcut conveniently calculates the 2015 International Residential Building Code MINIMUM (IRC Section R806 – Roof Ventilation 1, which states, in part, 1 square foot of Net Free Area for every 150 square feet of attic floor space with the attic defined as length x width floor of the attic). The shortcut actually overestimates a bit but that’s OK. It puts the roofing contractor in the ballpark which is useful when estimating.
Read the full article: pdf The Attic Needs Ventilation but How Much Exactly? (260 KB)