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.

Under floor ventilation requirements.

A house has 1 500 square feet of crawl space area. Where warranted by climatic conditions ventilation openings to the outdoors are not required if ventilation openings to the interior are provided. Here is an example. The purpose of sub floor ventilation is to replace the moist air with fresh dryer air.

Finned pre stamped foundation sidewall or soffit vent. Isbn 978 1 85946 679 7 pdf 683kb this file may not be suitable for users of assistive technology. View the sub floor ventilation requirements here. 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.

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. If necessary install mesh over this gap to stop vermin from getting under the house. Ventilation 2010 edition incorporating 2010 and 2013 amendments ref. Adequate ventilation reduces unwanted heat and moisture reduces utility bills.

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. 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. To convert to square inches multiply by 144.

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. Australian standard 3660 specifies the minimum clearance requirements between the ground and the underside of a subfloor. 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. The timloc airbrick telescopic underfloor vent and extension piece accessories are ideal robust and convenient solutions for providing natural ventilation into underfloor voids.

Ventilate the underfloor space by providing ventilation in two opposing external walls. Pre stamped foundation sidewall or soffit vent. The following are exceptions to sections 1203 3 and 1203 3 1. 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.

They have been designed to meet the requirements of the relevant building regulations scottish building standards and british standards as well as satisfying the. Australian standards and bca requirements.