Commercial Attic Ventilation Requirements

Attic ventilation is an important part of keeping your building healthy.

Commercial attic ventilation requirements.

Chapter 8 roof ceiling construction. Typically building codes include minimum requirements applicable to attic ventilation. 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. Now we can calculate the ventilation requirements using these products and our example building from before.

Current regulations state that the minimum attic ventilation requirements are 150 1. Chapter 9 roof assemblies. 21 5 and 387 lineal ft. 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.

2018 international residential code. 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. 2018 international residential code. Throughout the balance of this digest the terms attic and roof will and can be used interchangeably.

Code requirements the international building code. Made in the usa. Shop directly from the manufacturer. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.

This means that if you have a 1500 sq attic then you would need at least 10 sf of ventilation. On the upcodes website. All aluminum rust free construction residential commercial and industrial sizes. Contains sections covering roof framing roof sheathing and roof ventilation.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. 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. Roof vents exhaust or intake vents attic fans solar attic fans retrofit vents pvc vent caps ducted vents roof curbs and accessories. Intake vents located at the lowest part of the roof under the eaves allow cool.

The roofing industry also has practical guide lines for attic ventilation. 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.