Sub Floor Ventilation Spacing

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. Terracotta 230mm x 150mm 6 200vent in situ. Subfloor ventilation is cross ventilation of the subfloor space between the underside of the subfloor and the ground surface under a building.

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Inspect the subfloor space to ensure that the water is not coming from leaking pipes wastes or drains.

Sub floor ventilation spacing.

A minimum of five air changes per hour should be provided and double that for wet subfloor spaces. Openings should be provided within 750 mm of. 3600 specifies that the minimum requirement for sub floor ventilation should be one 1 ventilator of 8 400 mm. Of the australian standards a s.

Vent type l vent size l area per square mm. Aleta 230mm x. Ground moisture rising into or entering the subfloor space can create a damp environment which encourages timber rot fungus growth and the potential for termite activity. A clear opening area of 3500 mm 2 100 x 35 mm should be provided for every square metre of floor area.

Have a look at the just for fun exercise for more details on these requirements. It also enables a person to climb in and inspect the area for termites fungal decay and other building problems. The open space allows the air to move freely inside the subfloor cavity. If the ground under the subfloor space is dry and there is no evidence of moisture there is no need to increase the amount of ventilation.

The space under a suspended timber framed floor must be ventilated. Squared nett ventilation per lineal metre on both external and internal walls. If the ground or subfloor space is damp the first thing to do is identify the source of the moisture.