Under Floor Ventilation Requirements

View the sub floor ventilation requirements here.

Under floor ventilation requirements.

Pre punched nailing guides provided on flange. Houses built during the 1970s were sometimes built with a floor structure that extended past the foundation line so ventilation could be provided over the top of the foundation wall and between the floor joists. Finned louvers deflect rain or snow and prevent large insects from entering. Australian standard 3660 specifies the minimum clearance requirements between the ground and the underside of a subfloor.

You will need to chisel out a much larger area than a single brick to be able to pass the angled duct through. Australian standards and bca requirements. This standard is called termite management and it sets out a range of good building practices for avoiding termite attack and maintaining adequate subfloor ventilation. Finned pre stamped foundation sidewall or soffit vent.

The timloc airbrick telescopic underfloor vent and extension piece accessories are ideal robust and convenient solutions for providing natural ventilation into underfloor voids. The minimum net area of ventilation opening must not be less than 1 square foot for each 150 square feet of under floor space area. Ventilate the underfloor space by providing ventilation in two opposing external walls. A house has 1 500 square feet of crawl space area.

Reveal for stucco or siding. Isbn 978 1 85946 679 7 pdf 683kb this file may not be suitable for users of assistive technology. The total area of ventilation openings is permitted to be reduced to 1 1 500 of the under floor area where the ground surface is covered with a class i vapor retarder material and. Here is an example.

Adequate ventilation reduces unwanted heat and moisture reduces utility bills. The simplest method used to achieve this is to install a number of vents in the wall around the building and rely on natural ventilation air movement to take care of the underfloor ventilation. To convert to square inches multiply by 144. Pre stamped foundation sidewall or soffit vent.

If necessary install mesh over this gap to stop vermin from getting under the house. The purpose of sub floor ventilation is to replace the moist air with fresh dryer air. Where warranted by climatic conditions ventilation openings to the outdoors are not required if ventilation openings to the interior are provided. Where the exterior ground level is too high to carry air to the sub floor void in a straight line a telescopic underfloor vent should be attached to the back of the air brick to conduct and protect the airflow across up to 5 brick courses.

Ventilation 2010 edition incorporating 2010 and 2013 amendments ref. Ensure ventilation has a free and unobstructed path to all areas by making provision for ventilation air to pass through sleeper walls and other sub floor obstructions.