This moisture build up can cause deterioration not only the timber joists but also any coverings placed over the joists. Ventilation in suspended timber floors can be achieved by installing vents below the joist level in opposite walls of the building and if possible on all sides of the building (see figure 1).

Sub Floor Ventilation is important in your home. Tech-Dry can quote to increase your homes ventilation with new vents or by cleaning existing ones.

Q I am building an extension on to the back of my house and converting the garage to a bedroom. The existing house, built in the 1960s, has suspended timber floors, and the add-on area will have concrete floors. Some of the vents will be blocked by the extension. Please advise me how best to insulate

Sub-floor ventilation. Many traditional properties are built with a suspended wooden floor which sits above a void air space between the perimeter walls and ground. If this space is not ventilated, the air in it becomes stagnant and humid, and the moisture within it begins to condense on the brickwork and flooring. Over a

barrier, such as building paper. SUB-FLOOR VENTILATION. As the health and durability of suspended timber structures often depend on the ventilation to the void below, it is important to ensure that this is effective and unobstructed. Air bricks and other vents are often easily obstructed by raised external ground levels, and

Robust detailing for sub-floor ventilation gives a property the best start in the fight against moisture, damp, dangerous gases and even flooding. The Building Regulations Approved Document C states suspended timber floors and suspended concrete floors (including block and beam) have a provision for

ventilation. The 2005 BRANZ House Condition Survey found 38% of homes with suspended timber floors had less than half the subfloor ventilation required by the current vent openings. 10 metres. 1800 mm max. apart vents 750 mm max. from each corner. 100 x 25 mm base boards with. 20 mm gaps between ventilation.