Under Floor Ventilation Requirements

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.

Under floor ventilation requirements.

Pre stamped foundation sidewall or soffit vent. 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. Ventilation 2010 edition incorporating 2010 and 2013 amendments ref. The purpose of sub floor ventilation is to replace the moist air with fresh dryer air.

Isbn 978 1 85946 679 7 pdf 683kb this file may not be suitable for users of assistive technology. 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. 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. View the sub floor ventilation requirements here.

The timloc airbrick telescopic underfloor vent and extension piece accessories are ideal robust and convenient solutions for providing natural ventilation into underfloor voids. You will need to chisel out a much larger area than a single brick to be able to pass the angled duct through. To convert to square inches multiply by 144. Where warranted by climatic conditions ventilation openings to the outdoors are not required if ventilation openings to the interior are provided.

A house has 1 500 square feet of crawl space area. If necessary install mesh over this gap to stop vermin from getting under the house. Adequate ventilation reduces unwanted heat and moisture reduces utility bills. Ventilate the underfloor space by providing ventilation in two opposing external walls.

They have been designed to meet the requirements of the relevant building regulations scottish building standards and british standards as well as satisfying the. Finned pre stamped foundation sidewall or soffit vent. Here is an example. The following are exceptions to sections 1203 3 and 1203 3 1.

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. Finned louvers deflect rain or snow and prevent large insects from entering. Pre punched nailing guides provided on flange. Australian standard 3660 specifies the minimum clearance requirements between the ground and the underside of a subfloor.

The amount of ventilation required is 1 500 150 10 square feet. Australian standards and bca requirements.