Condensate Drainage

Where condensation may occur with-

j in a building, provide channels and weep holes that allow gravity to remove the moisture without damage to the building.

1. Many proprietary designs for slope glazing systems and skylights are designed to catch and drain condensate that may run off the interior surface of the glass in cold weather. If this is not done, the condensate will drip into the room below. In this slope glazing purlin, condensate gutters are built into the lower flanges of the aluminum structural member. The gutter on the uphill side will catch moisture that runs off the glass above it. (The gutter on the downhill side is of no use, but having gutters on both sides makes it impossible for careless workers to install the purlin upside down). Each purlin is supported at each end by an aluminum rafter. The rafter has a similar cross section to the purlin but is deeper. The connection between the two is made in such a way that water draining from the end of the purlin is caught in the gutter at the bottom of the rafter. Here it drains rapidly by gravity to the bottom of the rafter slope, where it escapes to the outside through weep holes.

2. Though condensation problems are generally much less severe in wall assemblies than in slope glazing systems, most proprietary metal curtain wall systems include channels, weep holes, and sometimes weep tubes to drain condensate and leakage from internal cavities (see also Drain and Weep, p. 17). â– 



Condensate gutter

Condensate gutters—

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