Sub Floor Ventilation

Sub Floor Ventilation and cross flow ventilation for suspended timber floors is essential.

Many homes in Adelaide are built with a suspended timber floor and therefore have a large space under this area. This sub-floor space under your home is important to the healthy and longevity of your home.   A home that lacks adequate airflow in its sub floor area can face many issues.

Firstly, moisture will penetrate through your floors from the damp soil beneath your home.  This in turn raises the homes internal humidity. An increased level of humidity inside encourages mould growth which can have serious health implications.  It puts your family at risk from allergic reactions, irritations,  infections and respiratory problems.

A damp sub floor can also affect your home by damaging your timber floors and skirtings.  Timber joists and bearers will absorb the moisture resulting in wood decay and possible termite activity.  Floors expand which can mean your floors feel bouncy and your floorboards bend, warp and potentially rot away.   Timber skirtings will begin to rot away and black mould can form.

Sub Floor ventilation under your home can be hindered if the area has become too small, has been blocked by new concrete slabs, inadequate amount of external vents or blocked external vents.
Common signs of a lack of sub floor ventilation include: dampness, mould, musty odours in living rooms or wardrobes, rotting timber floorboards, convex of floorboards.

Some of the ways to rectify this problem include:

  • Firstly start by having the sub-floor ventilation in your home checked.
  • Ensure that no water is pooling or seeping into the sub floor areas. Check external drains nears sub floor areas for blockages or breaks.
  • Check that soil, shrubs, plants and/or garden beds are not covering any existing vents.
  • Clear vents from accumulated mud, snails, spider webs.
  • Check your sub floor floor area for blockages, such as new concrete slab, storage of boxes and goods.
  • Evenly spaced openings.

Consquently, where there is still inadequate ventilation you may need to install additional mesh vents or low voltage fan ventilation.  The increase of cross flow ventilation to the area will decrease both humidity and condensation as external dry, warm air flows through the sub floor area.

Tech-Dry SA can help to fix this problem.   Our qualfied brick and stone masons are able to:

  • clean and remove debris from existing vents and where required replace these vents to match as best possible
  • increase the ventilation by adding additional vents to the sub floor area.
  • install a powered mini vent fan.

The mini vent fan is a powered low voltage fan that fits into an exisiting standard double brick vent space.  It can remove up to 2,800 litres per minute of damp sub-floor air.   

Free inspection and quotes are available for the repair, replacement or installation of vents to your home.