Ibc Roof Ventilation Requirements

For vented and unvented i e.

Ibc roof ventilation requirements.

For help finding them see our quick roofing guide to the ibc. Openings for ventilation having a least dimension of not less than 1 16 inch 1 6 mm and not more than 1 4 inch 6 4 mm shall be. However many other parts of the code deal with aspects of roofing. The primary roofing chapter in the ibc is chapter 15 roof assemblies and rooftop structures.

The primary roofing chapter in the irc is chapter 9 roof assemblies. 0 35 air changes per hour but not less than 15 cfm person. Ventilation openings having a least dimension larger than 1 4 inch 6 4 mm shall be provided with corrosion resistant wire cloth screening hardware cloth perforated vinyl or similar material with openings having a least dimension of 1 16 inch 1 6 mm minimum and 1 4 inch 6 4 mm maximum. Building code plus a building envelope specialist should be.

0 01 cfm square foot of conditioned floor area 7 5 cfm person that s basically the rate from the 2010 version of ashrae 62 2. The net free vent area nfva shall not be less than 1 150 of the area of the space being vented. 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. Ibc 1203 2 requires 1 150 th of the attic area to be ventilated but there is an exception that is commonly used instead.

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. However in more recent editions of the code unvented i e. In older buildings attic ventilation was mandatory. Theinternational building code 2012 edition ibc 2012 requires enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing to have cross ventilation for each separate space.

Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds squirrels rodents snakes and other similar creatures. Last year at the code hearings that rate was updated to. Section r806 roof ventilation r806 1 ventilation required enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. Most requirements for roofing and thermal efficiency in ibc are contained in chapter 13 energy efficiency or chapter 15 roof assemblies and rooftop structures however chapter 12 interior environment addresses among other topics ventilation and temperature control.