Fbc Attic Ventilation

See also section 503 2 10 6 of the florida building code energy conservation.

Fbc attic ventilation.

Fbc section 1203 2 newer studies newer ashrae studies have found that the practice of attic ventilation to be detrimental to structures in warm humid climates. A 120 volt receptacle outlet must be installed in the attic and within 25 of the equipment needing service fbcm 306 3 1 nec 210 63 k. Ventilation supply systems shall be designed to deliver the. Uninhabited spaces such as crawl spaces and attics shall be provided with natural ventilation openings as required by the florida building code building or shall be provided with a mechanical exhaust and supply air system.

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. To lower attic temperatures and to remove excess moisture. This air passes through the attic space where it displaces warm moisture laden air which in turn exits the attic via vents at or near the top of the space being vented. 403 2 outdoor air required.

Requiring service with the lighting outlet switch at the attic access. Attic ventilation serves two main functions. 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 permitted. 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.

Lowering the temperature in the attic can help reduce air conditioning energy costs and roof deck temperature optimize the service life of a roof covering and minimize ice damming. 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. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Warm humid new fbc codes allow construction practices which do not require attic to be ventilated.

Opening fbcm 306 4 1 nec 210 70 fbcrm1305 1 3 1 j. Ashrae detailed practices for 3 climatic conditions. Intake vents located at the lowest part of the roof under the eaves allow cool. In a balanced ventilation configuration ambient outside air enters into the attic space via soffit or eave vents.

A minimum 5 vent termination height above a gas fired air handler must be maintained. 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. 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.