Transcription of Technical Notes B on Brick Construction
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Technical Notes B on Brick Construction
21 BREVISEDA pril2002designed to stop any mortar droppings from blocking thecavity and allow water to flow around them. Use ofdrainage materials is not required, and in some casesmay contribute to water penetration problems within thewall. More information on drainage materials is pre-sented in Technical Notes21A of this series. Drip Edge/Flashing ExtensionWater that collects on flashing can re-enter the wallbelow if flashing terminates behind the face of the best performance, flashing should be extended 1 4in.(6 mm) beyond the wall plane and turned down at anangle of 45 degrees to form a drip. This forces wateraway from the wall protruding flashing is neither possible nor desirablein some cases. For example, exposure to ultraviolet radi-ation may cause some flexible flashings to these cases, flashing should be cut flush with the faceof the wall.
Columns In some cases, vertical supports may make it neces-sary to cut, puncture or otherwise interrupt the flashing. When this occurs, it is important to make sure that all
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