Weep (architecture)

In such cases the weeps may consist of a plastic, clay or metal pipe extending through the wall to a layer of porous backfill.

Weeps may also be found in metal windows and glazed curtain walls to permit interstitial condensation to escape.

[1] In building construction, weeps are typically found in a masonry veneer or cavity wall, just above the flashing.

One of the problems with this method is that the open head joints create large holes which may not be appealing.

There are some products such as aluminum vent and plastic grid that can be inserted into the weep holes to make them less conspicuous.

If the angle is too steep, the opening hole inside the wall cavity will be too high for water to come out.

If the angle is too flat, the mortar used in laying the bricks may drop into cavity and block the tubes.

Sometimes a shallow layer of gravel is laid to prevent mortar dropping from blocking the tubes.