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Understanding the Sub Floor Ventilation Procedure

The term “sub floor” means beneath the house’s floor whereas ventilation is the process of ensuring a constant flow of air into and out of a defined space by having an air inlet and outlet, or several of them for that matter.

Ventilation of your house’s sub floor is one of the most important, if not the most important, things you could do for both the long term quality and integrity of your house structure and of course for yourself and your family.

Why sub floor ventilation is vital in your house:

Fends of Termite Infestation

When your ventilation is as effective as it could possibly be, the constant flow and exchange of air means that when the ground is damp it dries a lot faster. The end result is that the moisture that would be trapped in the ground does not get absorbed into the stale air and finally into the floor timber and other building materials. 

Termites require damp, rotting wood to thrive. By taking away the moisture, they effectively choose to hunt around for some other place to call home. Your timber then stays pest free for a significantly longer period of time thanks to ventilation of the sub floor.

This way your house stays structurally secure as per the Australian Residential Building Regulations.

Keeps Mould and Mildew Off

Mould and mildew are similar to termites in that they both make their habitats in dark and damp places. Once the infestation starts it is very difficult to contain it. This will leave you wishing you had heeded the advice to adequately ventilate the space between the floor and foundation.

Better Health Standards for Your Loved Ones

The stale and moist air coupled with the rotting and decaying timber makes for a concoction of a rather irritating smell. This has the capability to affect asthmatic members of your family and cause a constant cough and runny nose.

How Does Ventilation of the Sub Floor Work?

Ventilation is a necessity for all buildings with a space between the ground and the floor. The extent to which each individual building has to be ventilated depends on factors such as the type of soil, the degree of the drainage and run-off plus the height of the structure itself off of the ground.

The type of timber used may also dictate the ventilation requirements.

1. The cheapest and most natural method of aerating your sub floor is to place small vents in the wall surrounding the building and let the natural flow of air run its course. This method may do quite a sufficient job, but more often than not, nature requires a gentle helping hand.

2. It then becomes a necessary step to install sub floor fans that suck out moisture and stale air and replace it with fresh air from the outdoors. This will help you construct your house according to the stipulations in the National Construction Code of Australia.

3. When choosing a suitable location to set up the sub floor fans, you or the professional setting them up must strategically place inlets and outlets in a way that they work in harmony and make sure that there are no stationary air pockets. For more information about sub floor ventilation click here.

Sub floor ventilation diagram

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