When choosing the best cavity weep to suit a project, one should consider the exposure and the finish of the elevation. Choosing a weep that offers sufficient outflow to service the masonry absorption area is essential, whilst aesthetically the appearance of the building should not be adversely affected.
Brickwork and stonework can normally accommodate weeps within the perp joints, and selection of an appropriate weep colour (or a weep manufactured in suitably translucent material) can result in the outlet merging with the mortar shade. Rendered surfaces are another matter – does one omit weeps in the hope and anticipation the render will prevent penetration of all water, or does one make some provision – so a discharge route is in place should it be required during the life of the building?
Whilst render may be water resistant when new, during the life of a building all rendered surfaces are susceptible to fissures and cracks. These can occur anywhere throughout the rendered area, as well as at junctions with alternative finishes and window/door openings. Therefore building-in a means for water to escape always makes sense, with the accompanying caveat they should ideally be unnoticeable!
Water penetrating a rendered surface can initiate five major deficiencies:
1) Damp banding and patching will manifest where arrested water pools on the DPC tray / lintel.
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