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Weep Vents create weep holes which are required over lintels to discharge collected water that may form at the window/ door head. Each vent sits in the masonry perp end.

The weep vents are positioned within the perp joints between masonry. Their function is two-fold:

  • They act as a weep to discharge water from DPCs, cavity trays and lintels.
  • They also act as ventilators to encourage the cavity to breathe.

IG weep vents also satisfy UK NHBC and Building Regulation requirements. The compact IG weep vent can be accommodated within perp joints even when the external skin is constructed of masonry units of minimal height. They are therefore suitable for use within a wider range of walling styles.

The weep vent performs efficiently and being available in several colours means it merges and harmonizes within masonry within which it is incorporated. They have full height baffle protected water discharge routes and are not susceptible to blocking.

A Stop End is required at each end of a lintel to prevent moisture cascading over the ends into the cavity and onto the inside wall. The use of Stop Ends quickly and economically introduces a lintel feature which removes the dangers that could occur with volumes of water being directed into the cavity.

Stop Ends can be incorporated into the moulded base of the lintel by a butyl anchoring strip enabling the Stop End to be secured towards the end of the lintels in the most appropriate position to suit the masonry perp joint. When fitted discharge from lintels is directed through brickwork weeps.

General information

BS polypropylene

Uniclass 2015
Perpend joint plastics weep holes (Pr_35_90_50_62)Primary
Specification data - Perpend joint plastics weep holes
Product Reference

Stop Ends

Available in two standard sizes, consult manufacturer for details and insert requirements.

Weep Vents

Size: 49 x 87 x 9 mm.


Consult manufacturer and insert requirements.

Standard product features


BS polypropylene.

Free airflow:

300 mm per unit (approximately).