MIL-HDBK-1001/5A
the same criteria as the primary drain system, by the
"contracted-weir" formula.
EQUATION: Q (ft 3/min.) = 200(b - 0.2H) H 1.5 (1)
where
b = scupper width (feet)
H = hydraulic head (feet), assumed 2-inch maximum depth
Have the total scupper cross-sectional area be a minimum of 3 times the cross-sectional area of the primary vertical drains, with minimum individual 3-inch scupper depth and minimum width/depth ratio of 2.5.
2.2.2 Deflections. Deflections maintained within normal limits (refer to par. 2.3.1) will have no practical effect on drainage on a roof surface with the minimum roof slope.
2.2.3 Expansion Joints. Roof expansion joints are recommended at the following locations:
a) Junctures between changes in deck material (e.g., from steel to concrete);
b) Junctures between changes in span direction of the same deck material;
addition;
c) Junctures between an existing building and later
d) Deck intersections with nonbearing walls or
wherever the deck can move relative to the abutting wall, curb or
other building component;
meters);
e) Maximum spacings of 200 to 300 feet (61 to 91
f) Junctures in an H, L, E, U, or T-shaped building;
g) At building expansion joints.
Expansion joints should be located at high points, with drainage directed away from them. They should allow for relative movement in three directions, vertical, transverse, and longitudinal, detailed for minimum 8-inch (203-millimeter),
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