Codes & Ratings
What is Ventilation Code?
Roofing Glossary · Codes & Ratings
Definition
The building code requirements specifying minimum attic ventilation ratios to prevent moisture accumulation and heat buildup. The IRC requires a minimum net free ventilation area of 1/150 of the attic floor area, reducible to 1/300 when at least 40% (and not more than 50%) of the ventilation is in the upper portion of the space (i.e., ridge venting). Proper code-compliant ventilation is a condition of most shingle warranties.
Related Roofing Terms
→
Ridge VentA continuous or segmented ventilation product installed along the entire length of the roof ridge th...
→SoffitThe finished underside of the roof overhang that spans from the exterior wall to the fascia board. S...
→Ventilation CheckAn assessment of the attic ventilation system to ensure adequate airflow from intake (soffit) vents ...
→Building CodeThe minimum legal standards governing construction methods, materials, and installations in a given ...
→IRC (International Residential Code)The model building code developed by the International Code Council (ICC) that sets minimum standard...
More Codes & Ratings Terms
Get an Instant Roof Estimate
Now that you know what ventilation code means, put that knowledge to work. Enter your address to get a free satellite-based estimate and compare standardized quotes from pre-vetted local contractors.
Get My Free Estimate