Floor Void Ventilation Requirements

And the floor level of the garage is below the level of the building use the garage floor as the lowest floor for rating.

Floor void ventilation requirements. Voids should be ventilated by openings providing not less than 1500mm 2 per metre run of external wall or 500mm 2 per m 2 of floor area whichever gives the greater opening area. However the floor structure is supported by external and internal walls. Elevated buildings in a zones in an elevated building located in an a zone any flood zone beginning with the letter a the lowest floor used for rating is the lowest elevated floor with the. High volume change potential 150mm 300mm total void.

Supports underneath the floor are permanent and. Additionally if the span is greater than 10m the overall ventilation area should be increased to at least 0 6 of the total roof area. Telescopic gas vent outlets 1201 1201ab 1206 gvl900 the combined units will allow ventilation outlets to either a sub floor void or via a range of adaptors to a venting layer and allow the provision of a minimum of one complete volume change per 24 hours as required by the nhbc. The recommended minimum area of ventilation required for under a suspended timber floor is 1500mm 2 for every metre of perimeter of the structure.

Ventilation openings should be provided on at least two opposite sides. The building regulations approved document c states suspended timber floors and suspended concrete floors including block and beam have a provision for ventilation on two opposing external walls of not less than 1500mm per metre run of external wall or 500mm per metre of floor area whichever works out to give the greater amount of ventilation. The new zealand building code clause e2 external moisture includes an acceptable solution e2 as1 for subfloor ventilation of suspended timber floors. Another common way these vents can be blocked is by an extension with a solid floor being built onto a property without providing proper access to the original vents.

A suspended floor is a ground floor with a void underneath the structure. A minimum ventilation void of 150mm should be provided below the underside of precast concrete and timber suspended floors. The timloc vent units will achieve. This requires a minimum of 3 500 mm2of net open area for every 1 m2of the house plan floor area.

The floor can be formed in various ways using timber joists precast concrete panels block and beam system or cast in situ with reinforced concrete.