Transcription of Technical Notes B on Brick Construction
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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.
2 tial for galvanic action between the metals should be considered. Flashing materials should overlap the metal drip edge by a minimum of 1 in. (25 mm), and be fully
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