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Timloc Invisiweep (IW)

The almost-invisible, multi-function wall weep for discharging water from external walls. Suited for use with the Timloc cavity tray system, over external lintels and on external masonry walls. Invisiweep has numerous patent-pending innovative features, including a venturi effect outlet tube that reduces water pressure, allowing for optimal drainage.

Invisiweep satisfies all NHBC requirements and meets British standards: BS5250, BS5628 and BS8215.



  • Any situation where water must be discharged from an external wall, including:
  • At ground floor slab level
  • Within cavity tray systems
  • Over external lintels
  • On external masonry walls



  • Height: 65mm
  • Width: 10mm
  • Length: 102mm

Technical Information:
Cavity wall weeps or cavity drain units should always be installed in cavity masonry walls to allow drainage at regular intervals. They are required at ground floor, below DPC level, and must also be provided as part of any cavity tray run, including roof abutment trays, over lintels and continuous cavity tray systems, such as gas protection barrier systems.
Unfortunately, many sites are still providing a weep hole facility by simply leaving the perpend joints between bricks open, these open joints are prone to being filled. Perpendicular joints left open can be very noticeable and result in an infestation of nest building insect and small mammals and allow the ingress of driving wind and rain, which leads to the need for a proprietary weep unit such as the Invisiweep. Invisiweep has been designed and flow tested to optimise the discharge of water while meeting the requirement for a small concealed outlet size.

Timloc Invisiweep (IW)

Sales Tax Included
    • Invisiweep should be used in perpendicular joints to perform the function of a drainage channel wherever water could collect inside a cavity wall such as over external lintels, or over cavity trays.
    • To work effectively the Invisiweep should be placed directly on top of the base of a cavity tray, DPC or on the front edge of a lintel.
    • Wall weeps should be placed at 450mm centres above openings with a minimum of two to comply with NHBC recommendations.
    • Care should be taken to ensure the Invisiweep is kept clear of mortar and does not become blocked. This is important at the cavity side of the weep which could be blocked by mortar droppings from above.


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