Sydney Ventilation | Sub Floor Ventilation

Do you Require a Sub Floor Ventilation system?

Your sub floor, also called the under floor area, may seem insignificant since it doesn’t form part of your living space. However, the simple fact of the matter is that space really has a high effect on the quality of air you breathe while you’re indoors and might affect your health if your sub floor vents are inadequate.

Poor sub floor ventilation could cause bad health for you and your nearest and dearest. Additionally, it could lead to harm to some parts of your house or business space that are vulnerable to decay that don’t have ventilation fans. This damage brought on by the creation of mold due to high humidity levels in the home.

It’s easy to forget that the area under your house needs venting. After all, you aren’t down there to observe the air quality. But that does not mean it is not important. If there’s a problem with the venting beneath your property, it can impact your living environment. Moisture beneath the house might get your attention with a musty odor or sunken floorboards. This is because a moist environment rots wood and allows mold expansion. Worse, moist or rotten timber is a excellent spot for termites to create a nest. In the worst case scenario, moist from beneath the house causes illness. Preventing dampness under the house or repairing it early will help keep you and your family healthy. Making certain you have appropriate sub floor ventilation is a vital step to fixing these issues.

So how can you tell if there’s a problem is beneath the home?

Most individuals don’t realise that there is a problem with the sub floor until it becomes an issue in the main house. As we have already mentioned, odours and sunken floors might indicate a problem with the sub floor, but there are other signs too. Moist air in the living room can come from beneath the house. So if there is a great deal of condensation on your windows, or the home feels humid, it is time to have a look at the ventilation of the entire house, including the sub floor.

When it’s possible to inspect the crawl space for signs of condensation, mould or rot, then you need to. Investigate any indications of water beneath the house, eg. discoloured timber. Attempt to identify the source of the water:

  • Is there a leaking pipe?
  • Are there any signs of condensation?
  • Is there any visible mould or mildew?
  • Can rain water come in?
  • If there is a smell, is it more powerful in the crawl space?
  • Not everyone can get down under their property, but if you believe there may be a issue, it is definitely worth asking a friend or relative to take a look for you.

Where does the moisture come from?

Moisture winds up under the home in many of ways. Some are less obvious than others. It’s easy to diagnose a drip from a leaky pipe, or even a puddle where rain water could have poured in through a gap in the building. It’s more difficult to tell whether the moisture is coming up through the ground. Surface soil might seem dry, but conceal a whole lot of moisture. As the moisture evaporates, it comes up through the soil and beneath the home. Without adequate ventilation, this moisture is trapped under the house with no way out. This is the reason the air under the house might feel moist, even if there is no visible water resource.

How can we fix it?

If the issue is due to a leak under the house, first thing to do is seal it up. As soon as you’re positive you’ve patched up any leaks, and drained out any extra water, it is time to consider ventilation.

Without ventilation, the humidity below the home has nowhere to go. Even if there are existing vents, the air flow may not be fast enough to extract moisture. In cases like this, you might require an exhaust fan to automatically remove the stale air. The essentials of sub floor ventilation are rather easy, a well ventilated area which allows for fresh air to enter from various areas will generally create a much healthier sub floor area.

Simple air vents (commonly brick type vents with little holes in them) strategically positioned around the sub floor perimeter is the most common measure to guarantee sub floor ventilation. This utilizes natural (or passive) cross flow of air, as shown in the below picture. These ought to be free from any congestion and above floor level so that airflow isn’t obstructed. Oftentimes we find that this alone might not be enough. Furthermore it’s possible that things like home decks or extensions attached to the side of this building can lead to those vents being blocked, in which case it might be necessary to supplement these vents using a few mechanical ventilation.

sub floor ventilation cross flow

If you would like to look at adding an exhaust fan to your sub floor area there are a couple of considerations, and a couple of distinct methods of configuring the machine. This may vary depending upon your sub floor area and factors like the amount of passive vents which you have, if there are problematic regions with no external vents . So lets consider a few options below.

Install a Wall Mounted Sub floor fan
This might be the simplest solution and involves simply installing a suitable fan on the wall. In the below example we have a wall mounted fan pulling from the sub floor area to the exterior. The below example has passive vents on one side of their house, which allow for air to enter. Bear in mind you’ll have to have a power socket installed in the sub floor area in close proximity so the fan can be plugged in. So unless there’s one already there you will have to hire an electrician to do this.

sub floor wall fan option

Some models may also be configured to provide air, so in a situation with no passive vents it would be possible to put in 1 fan providing and another fan exhausting according to the below. This provides you with a balanced pressure system:

sub floor fans 2 fans