Commercial Attic Ventilation Requirements

On the upcodes website.

Commercial attic ventilation requirements.

21 5 and 387 lineal ft. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. This means that if you have a 1500 sq attic then you would need at least 10 sf of ventilation.

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. The roofing industry also has practical guide lines for attic ventilation. Typically building codes include minimum requirements applicable to attic ventilation. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

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. Intake vents located at the lowest part of the roof under the eaves allow cool. If we assume a ventilation strategy that involves a combination of dome roof vents and continuous soffit vents this building would need 22 15 diameter dome roof vents 3096 sq in. Attic ventilation is an important part of keeping your building healthy.

Chapter 9 roof assemblies. On the upcodes website. 2018 international residential code. 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.

Current regulations state that the minimum attic ventilation requirements are 150 1. Now we can calculate the ventilation requirements using these products and our example building from before. Chapter 8 roof ceiling construction. In cold climates the primary purpose of attic or roof ventilation is to maintain a cold roof temperature to control ice dams created by melting snow and to vent moisture that moves from the conditioned space to the attic ventilation acts to bypass the vapour barrier created by most roof.

Code requirements the international building code. 2018 international residential code. Shop directly from the manufacturer. Roof vents exhaust or intake vents attic fans solar attic fans retrofit vents pvc vent caps ducted vents roof curbs and accessories.

Contains sections covering roof framing roof sheathing and roof ventilation. Throughout the balance of this digest the terms attic and roof will and can be used interchangeably.