Timloc Through-Wall Cavity Sleeve for Two Airbricks Stacked 229×152 (1 pcs)

The Timloc double through-wall cavity sleeve is designed for use where two airbricks are stacked vertically, bridging the cavity to maintain a clear ventilation path from the outer leaf to the inner. Without a sleeve like this, cavity fill insulation or general debris will block the airflow entirely, which is exactly the kind of problem that shows up months later as damp, condensation, or a failing floor void. It is a simple product with a specific job, and it does that job well.

Cavity walls create an obvious problem for underfloor ventilation. The airbrick sits in the outer skin, but the air still needs to get through to the inner leaf. This sleeve acts as a duct, keeping that channel open regardless of what is going on inside the wall cavity. The timloc double through wall cavity sleeve handles the stacked configuration, meaning it accommodates two airbricks positioned one above the other rather than a single unit.

Where the Timloc Through-Wall Cavity Sleeve Gets Installed

This sleeve is used during new builds, extensions, and retrofit insulation projects wherever the external wall is a cavity construction and two airbricks are being stacked. It is particularly relevant on older properties being retrofitted with cavity wall insulation, where preserving existing sub-floor ventilation is a building regulations requirement. Bricklayers and general builders will typically install these during the blockwork stage before the cavity is filled.

The sleeve fits the 229×152 airbrick format, which is one of the most common sizes in UK residential construction. Timloc manufacture a wide range of cavity ventilation products, and this sleeve is part of a system designed to work alongside their airbricks and cowls. That said, it will suit any compatible airbrick of the same dimensions from other manufacturers.

At this price point, it makes sense to order a few extra when you are doing a run of airbrick positions across a terrace or on a larger extension. Nobody enjoys making an extra trip to the merchant because they are two sleeves short on a Friday afternoon. Timloc build these to last in the wall, not to be handled gently, so they travel well in the back of the van.