Blocked Air Vents

Have your air vents been blocked or sealed?

Is Cavity Wall Insulation Blocking Your Air Vents?

Houses built with a cavity wall construction will typically have air vents visible on the outside “leaf” of the wall. There are commonly two types of vents; those in the wall appearing above floor level are designed to ventilate the cavity. In properties that have a suspended timber floor, there will also be air vents located in the outside “leaf” appearing below floor level, these are installed to allow ventilation of the void below the floor.

You can check which ventilation your property has by looking at the house from the outside.

Are your outside air vents blocked?

It is vital that the air vents installed to ventilate the area below the floor are not blocked. If these vents have become blocked by debris in the cavity, insulation or have been deliberately sealed using silicone sealant or similar, then the air flow beneath a timber floor will be restricted or completely removed, which can lead to floor timbers rotting.

When cavity wall insulation is installed in a property, air vents designed to ventilate the cavity can routinely be sealed by the installer – this should not be done with sub floor air vents unless they are replacing them with new ones. If the only sub floor air vents that your property has have been blocked by silicone or similar, then there is a risk that the area beneath the floor is not being ventilated effectively.

If your vents are blocked, damage may have been caused to your floor timbers. You may not be aware of this damage yet and it is vital that this is addressed to prevent further damage.

Blocked air vents can cause serious damage to your house so it’s vital to deal with them.

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