4 Dirty Little Secrets About the Sub Floor Ventilation Industry
Sub floor ventilation isn’t something you typically think about when building a home. Chances are that you’re only reading this because you’ve been told you have a sub floor/under floor issue, such as:
- Musty or smelly floorboards
- Timber rot (wet or dry)
- Mould or mildew growth
- Rising damp in your home
… And that’s alright! Sub floor ventilation isn’t as exciting as your feature lighting, kitchen cabinets or upholstery choices.
But you shouldn’t ignore your
We’re going to outline a few secrets (or rather, tips) you should be aware of when looking into
1) Sub Floor Ventilation is an Afterthought
If [you have a water leak] you could have a mould metropolis under [your floor], plus other unknown rot & damage. ~2 years ago a stain in the ceiling of my mudroom led to the discovery that the shower drain had been leaking, probably for aUnstoppableDrew, Reddit
coupleyears, but slow enough the water spread laterally soaking the subfloor instead of directly dripping down. We had to rip out the entire shower stall, and even replace part of topplate where the second floorwall sat on top of the first. It was an epic nightmare that dragged on for longer than it should have, and we didn’t have a shower for like 6 or 8 months.
In short: Your home more than likely has little to no sub floor ventilation, unless you have specifically installed some form of fan or ventilation system for that purpose.
Typically, sub floor spaces in newly built homes will include vent outlets—though this alone will not be enough to extract moisture or stop mould growth.
Addressing mould growth requires ambient airflow, and minimal to no condensation. Using
2) Ambient Ventilation Sucks
You might be told to install some vents and be done with it—but that simply isn’t enough.
Ambient ventilation works on two main principles: thermal expansion, and airflow. If you have no air moving through your sub floor, that air isn’t going to go anywhere.
If your sub floor space isn’t heating up, the air in it won’t expand. Given that sub floor spaces are already the lowest point of the house, just above constantly shaded earth, the chances that your sub floor area is naturally heated is next to nil; ambient air flow generated by heat isn’t going to happen.
So why would you bother with simply putting vents on the side of your
3) One Fan Won’t Solve All Your Problems
Quite frankly, every home is different—one solution won’t apply to every home. Some homes have divided segments in their
It’s important to note that simply installing an extraction fan and turning it on won’t solve your problems. Sometimes you have moisture issues in certain areas of your sub floor that require specialised airflow to treat.
This style of
Perhaps one of our most common styles of installation; the ‘Push/Pull Method’ relies on
Roof Mounted Extraction
Whilst it may be unconventional, using a Solar Whiz unit for
Single Duct Extraction
Sometimes simple is the most effective. By placing a single duct near the centre of your home’s
4) A Solution Half-Solved is a Returning Customer
When you set out to solve a
Solar Whiz attempts to rectify your
Solar Whiz will tell you exactly what the problem is, and how best to address it. Prevention is key to ensure that moisture doesn’t damage your stumps or floorboards.