What is sub floor ventilation?

A subfloor ventilation system extracts damp air from your home which intern allows dry fresh air to enter the areas under your floor. It is installed within your subfloor space and prevents excessive moisture from making its way inside your home.

What is the minimum sub floor ventilation per mm2 m of wall in Melbourne with no membrane?

The recommended minimum area of openings for sub-floor ventilation is 6300 mm2/m length of external wall. The vents should be spaced not more than 600mm from each corner, evenly distributed and located to ensure cross-ventilation.

How much does it cost to install subfloor ventilation?

Underfloor Ventilation Cost A quality sub floor ventilation system with supply or exhaust fans for an averaged sized home around Sydney and in Australia should be around $2500 supplied, installed, including GST and 5 years warranty.

Why do you need subfloor ventilation?

The purpose of sub floor ventilation is to replace the moist air with fresh dryer air. In order to ventilate more effectively, installing sub floor fans will enable you to extract moisture and damp/stale air from the sub floor area and replace it with fresh air drawn from the outside by one or more sub floor fans.

What is a subfloor space?

A subfloor is the structural part of the floor of your property upon which your decorative floor rests—underlay and carpet, wooden floorboards, tiles, linoleum and vinyl. A subfloor is usually either a stump-style with the plywood laid over the top or a concrete slab. The cavity is the space below the subfloor.

How thick should a subfloor be?

The minimum thickness of plywood for subflooring is about 5/8 inch. Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch. There are several factors that determine what subfloor thickness is optimal for added benefits like insulation.

Why are the two reasons sub floor ventilation is required in buildings?

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. Subfloor ventilation increases air flow, reducing any damaging water vapour in the subfloor space.

Is subfloor ventilation important?

Subfloor ventilation is especially important in climates such as those experienced in New South Wales. With a subfloor ventilation system you can significantly reduce the risk of damage to your property and the health of your family.

How do you ventilate under floorboards?

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). These vents must be enclosed to prevent air getting into the cavity of block wall construction.

Do you need airflow under a house?

Surface soil might appear dry, but hide a lot of moisture. As the moisture evaporates, it comes up through the soil and under the home. Without adequate ventilation, this moisture is trapped under the house with no way out. This is why the air under the home might feel damp, even if there’s no visible water source.