Drain And Weep

a strip of redwood held on with screws. This is not a rainscreen detail; any defect in the glazing compound will result in water leakage between the glass and the rafter. Because of surface tension, water that has leaked through will cling to the rafter and run down its sides. This detail furnishes a small drainage gutter milled into the rafter on either side to catch this water and conduct it to the bottom of the rafter, where it is wept to the outdoors.

2. The outer wvthc of a masonrv

cavity wall is expected to leak water, especially as the mortar joints age and deteriorate. The leakage drains down the cavitv until it encounters an inter-

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