2015 Ibc Attic Ventilation Requirements

4 x16 soffit vent 26 sq in.

2015 ibc attic ventilation requirements. Typically building codes include minimum requirements applicable to attic ventilation. 2015 international residential code for attic ventilation air vent inc. Ridge vent 20 sq in. 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.

2 continuous soffit vent 8 sq in. 1203 4 under floor ventilation the space between the bottom of the floor joists and the earth under any building except spaces occupied by basements or cellars shall be provided. Air vent provides a complete line of ventilation products that meet the highest standards for quality and performance. The following are the requirements taken directly from the irc.

To this end the 2015 version of the international building code ibc includes new provisions that relate to unvented enclosed rafter truss assemblies and unvented attics. 15 diameter dome roof vent 144 sq in. Contributes to but does not supersede thermal resistance requirements for attic and roof assemblies in section c402 2 1 of the international energy conservation code. Now we can calculate the ventilation requirements using these products and our example building from before.

The roofing industry also has practical guide lines for attic ventilation. These rules especially in section 1203 3 unvented attic and unvented enclosed rafter assemblies dictate how design professionals specify vapor retarders and. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Code requirements the international building code.