Roof Ventilation Regulations

The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves.

Roof ventilation regulations.

The net free vent area nfva shall not be less than 1 150 of the area of the space being vented. Required ventilation openings shall open directly to the outside air and shall be protected to prevent the entry of birds rodents snakes and other similar creatures. Openings in roof framing members shall conform to the requirements of section r802 7. Cold roofs must have ventilation.

Warm roofs must have a vcl bonded to the deck. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. Duo pitch roofs greater than 200 pitch or greater than 10m span should have additional ventilation at the ridge to assist airflow through the roof void equivalent to at least a 3 mm wide continuous gap. Roofs must be wind resistant and strong enough to walk on.

R806 2 minimum vent area. 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. Waterproofing should extend up the adjacent walls at least 150mm from the roof surface. The key to proper ventilation of your roof and attic is balance.

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. These ventilation needs are calculated differently.