Residential Roof Ventilation Requirements

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.

Residential roof ventilation requirements.

Attic venting serves an important purpose and is key to a well performing roof system. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. The key to proper ventilation of your roof and attic is balance. 2018 international residential code.

The roofing industry also has practical guide lines for attic ventilation. On the upcodes website. See the benefits of attic ventilation a new roof is more than just shingles. Selecting metal roof and wall panels is a strategic investment for the life of a building.

2018 international residential code. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. Ventilation 2010 edition incorporating 2010 and 2013 amendments ref. Chapter 8 roof ceiling construction.

Typically building codes include minimum requirements applicable to attic ventilation. To protect their investment it is key that your customers ensure the proper ventilation system is installed. As an example of what you can find in chapter 8 of the 2018 irc see. Isbn 978 1 85946 679 7 pdf 683kb this file may not be suitable for users of assistive technology.

You can calculate attic ventilation requirements by determining the square footage of your attic. Enter square footage calculate or enter the square footage of the attic or area to be vented. The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. Code requirements the international building code.

Optimal air movement not only promotes temperature regulation and energy efficiency but also reduces the risk of moisture related issues like condensation build up. A ridge vent is a ventilation strip that is placed along the ridgeline of the home. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.

Anyone involved with residential roofing should become familiar with the purpose of attic ventilation and understand how to achieve an effective ventilation system while meeting building code requirements.