Timloc airbricks for ventilating suspended ground floors and external cavity walls. Used with underfloor vent systems and cavity sleeves. Available in a range of colours to match common brick and mortar finishes. Sold in boxes of 20.
Colour
Price
QTY
Black
£11.87£14.24
Brown
£11.87£14.24
Buff
£11.87£14.24
Grey
£11.87£14.24
Terracotta
£11.87£14.24
White
£11.87£14.24
Blue & Black
£11.87£14.24
These Timloc cavity wall vents are a standard fix for ventilating suspended timber ground floors and providing airflow through external walls. Fitted into the outer leaf of a cavity wall, they work alongside underfloor vent systems and cavity sleeves to pull fresh air under the floor and keep the subfloor space dry and well-ventilated. That matters a lot more than people give it credit for — a poorly ventilated subfloor is a fast route to timber decay and damp problems that are expensive to put right.
Buying in a box of 20 makes sense for new builds, extensions, or any project where you’re installing a run of airbricks along the base of an external wall. The volume pricing saves you making multiple trips to a builder’s merchant for a handful at a time, and having spares on site is never a bad thing.
Cavity Wall Vent Colour Options
Getting the colour right is one of those details that matters once the job is done and the client is walking round the outside of the building. These airbricks are available in Black, Blue and Black, Brown, Buff, Grey, Terracotta, and White, which covers the range of common brick and mortar tones well. Select the closest match to your brickwork before ordering — it takes seconds and avoids the awkward conversation about why the vents stand out like a sore thumb.
The louvred face design allows airflow while offering some resistance to pest entry and driving rain. They’re sized to fit standard brick courses, so installation is straightforward when the coursing is planned correctly during the build or when cutting out and replacing existing blocked vents on older properties.
Pro Tip: When replacing old terracotta airbricks on solid-floor conversions, check the existing vent positions are still at ground level before ordering replacements, as soil build-up over the years can partially block the opening and reduce effective airflow even with a new brick fitted.
Timloc airbricks are used in new-build and renovation work wherever a suspended timber ground floor needs cross-ventilation. They're fitted through the outer leaf of a cavity wall, typically at intervals of no more than 1.8 metres along the exposed perimeter, and connected through the cavity using a sleeve unit to carry air to the underfloor void. They're equally useful when replacing cracked, blocked, or broken existing airbricks on older properties where subfloor ventilation has been compromised.
Groundworkers, bricklayers, and general builders use these as a routine part of a ground floor build-up. They're also specified by damp-proofing contractors when improving subfloor ventilation as part of a timber treatment or damp remediation programme.
Best For
Suspended timber ground floor ventilation
External cavity wall vent positions
New-build and extension groundworks
Replacement of blocked or damaged airbricks
Damp remediation and subfloor treatment projects
Works With
Underfloor vent duct systems
Cavity sleeve units
Standard brick coursing
Internal subfloor ventilation grilles
Key Features
Available in 7 colours to match brickwork
Louvred face for airflow and weather resistance
Sized to fit standard brick courses
Sold in boxes of 20
Suitable for new build and replacement applications
Not suitable for: Not suitable for use without a cavity sleeve where a cavity wall is present, as unsleeved airbricks will simply vent into the cavity rather than the subfloor void. Not designed for use in solid floor construction where no subfloor void exists.
Airbricks should be positioned at the base of the outer wall, ideally with the bottom of the vent at least 75mm above finished ground level to reduce the risk of blocking by soil or debris. Space them at regular intervals along the exposed perimeter, generally no more than 1.8 metres apart, and ensure each one connects through to the subfloor void via a correctly sized cavity sleeve.
On existing properties, cut out the old airbrick carefully to avoid disturbing surrounding mortar and brickwork. Bed the new airbrick in fresh mortar, check it's level, and point up neatly around the edges. Make sure the cavity sleeve is clear before finishing.
Determine the required number and spacing of airbricks based on the floor perimeter, aiming for no more than 1.8m intervals
Mark the vent positions on the outer wall, ensuring the bottom of each opening sits at least 75mm above ground level
Cut out the existing brickwork or form the opening in a new-build leaf at the correct course height
Fit the cavity sleeve through the wall to connect the outer vent position to the subfloor void
Bed the airbrick into fresh mortar, checking it is level and flush with the surrounding brickwork
Point up neatly around all edges and allow the mortar to cure before loading the area
Do these airbricks come with cavity sleeves included?
No, the cavity sleeves are sold separately. You'll need to select the correct sleeve to span the width of your cavity and connect the airbrick through to the subfloor void. Using an airbrick without a sleeve in a cavity wall will simply vent air into the cavity rather than where it's needed.
How many airbricks do I need for a suspended floor?
As a general guide, space airbricks at no more than 1.8 metre intervals along each exposed external wall. The exact number will depend on the floor perimeter and any internal sleeper walls that may restrict airflow, so check current Building Regulations guidance or your architect's specification if in doubt.
Timloc airbricks are manufactured from uPVC, which gives them good resistance to moisture, frost, and the kind of ground-level knocks they're likely to take over time. The louvred face limits direct rain ingress while maintaining airflow. They are dimensioned to fit standard brick courses and are suitable for use in both new-build cavity walls and solid wall replacement applications when fitted with the appropriate sleeve.
Brand
Timloc
Material
uPVC
Available Colours
Black, Blue & Black, Brown, Buff, Grey, Terracotta, White
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