The original, time-served cavity-drain vent
Whenever a cavity tray, lintel or DPC turns moisture back into the cavity, you need a route for that water to escape. Full-height weep holes do the job with a one-brick insert that satisfies NHBC and BBA guidance—and bricklayers love them because there’s zero fiddling with cut bricks or mortar nibs.
At Spechunter we stock the Timloc 1143 series in every colour off the delivery truck, plus matching extension sleeves for thick render or stone cladding.
Quick-pick colour chart
| Colour | Product link | Box qty |
|---|---|---|
| Black | 1143 Black | 50 |
| Blue-black | 1143 Blue-black | 50 |
| Brown | 1143 Brown | 50 |
| Buff | 1143 Buff | 50 |
| Clear | 1143 Clear | 50 |
| Grey | 1143 Grey | 50 |
| Terracotta | 1143 Red-terracotta | 50 |
| White | 1143 White | 50 |
Need extra reach behind render? Add the 1144 Extension Sleeve (250 mm long).
Why choose the 1143 full-height vent?
BBA-certified polypropylene—UV-stabilised, frost-proof and 60-year design life.
Full-brick format—sits flush in the perp joint; no half-bat bricks or site trimming.
Integral water baffle at rear stops wind-driven rain blowing deep into the cavity.
4 mm vermin grill keeps out bees and wasps without blocking airflow.
Where to install
Above every cavity tray—lintels, bay windows, parapets and balconies.
At ground-level DPC—one per 900 mm in retaining walls.
At floor edges—especially over party-wall DPC horizontal socks.
Spacing rule: one vent every 450 mm (≈2 bricks), minimum two vents per tray.
Three-step installation
Set the cavity tray or lintel, making sure there’s a 25 mm clear space behind.
Place the 1143 into the perp joint—logo to the front, water-baffle downwards.
Point the brickwork, keeping mortar below the front grill clear to maintain airflow.
For thick render, slide the 1144 sleeve over the rear end before insertion.
Frequently asked questions
Do I need weeps if I’m using concealed vents?
You can mix types—just keep to the 450 mm spacing. Full-height vents are quicker on standard façades; concealed vents suit high-end brickwork.
How many boxes for a typical house?
A four-bed detached with ±30 m of cavity trays needs about 70 vents → two boxes.
Are plastic weeps allowed above 18 m?
Not any longer. For high-rise specify our non-combustible A1 weep holes in zinc or aluminium.
Next-day delivery—any catches?
Order before noon, spend £200 ex-VAT and check our delivery information for remote-area surcharges.
Complete the moisture-management package
Pre-formed trays – Timloc Inter-Loc IL4P
High-bond DPCs – Visqueen Zedex CPT
Cavity fire-stops – ARC Cavity Stop Socks
Need NHBC sign-off or CAD details? Contact us or call 0118 922 7941—Spechunter will chase down every spec for you.
Spechunter.co.uk – Chasing down specialist construction specifications since 1988.
