Under Floor Ventilation Requirements

To convert to square inches multiply by 144.

Under floor ventilation requirements. 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. Pre stamped foundation sidewall or soffit vent. Here is an example. 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.

You will need to chisel out a much larger area than a single brick to be able to pass the angled duct through. Pre punched nailing guides provided on flange. 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. 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.

Isbn 978 1 85946 679 7 pdf 683kb this file may not be suitable for users of assistive technology. Adequate ventilation reduces unwanted heat and moisture reduces utility bills. 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 pre stamped foundation sidewall or soffit vent.

They have been designed to meet the requirements of the relevant building regulations scottish building standards and british standards as well as satisfying the. The amount of ventilation required is 1 500 150 10 square feet. 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. A house has 1 500 square feet of crawl space area.

Ventilate the underfloor space by providing ventilation in two opposing external walls. The following are exceptions to sections 1203 3 and 1203 3 1. Reveal for stucco or siding. 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.

If necessary install mesh over this gap to stop vermin from getting under the house. Ventilation 2010 edition incorporating 2010 and 2013 amendments ref. Where warranted by climatic conditions ventilation openings to the outdoors are not required if ventilation openings to the interior are provided. Australian standard 3660 specifies the minimum clearance requirements between the ground and the underside of a subfloor.

Australian standards and bca requirements. View the sub floor ventilation requirements here.