This keeps the load down to approximately 25 lbs.
Roof leader design.
During design an engineer or architect should lay out a roof drain system consistent with the structural design of the roof.
See figures 1 2 and 3.
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Flat roof normally for a flat roof with a 30 lbs.
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Select type of gutter to be used.
Divide the total roof area by the area that one leader will handle.
Each leader must be large enough to handle the volume of water to be drained the greater the leader capacity the fewer roof drains are needed.
Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.
The above result is the number of roof drains required for the building.
Square feet that can be drained by one roof leader at the local maximum rainfall rate.
In general roof drains are spaced equally and are located in low points of the roof or in any areas where water accumulates.
Total roof area.
But this isn t the whole story.
Size gutter based on type peak flow and slope.
Keep the following considerations in mind for different roof types.
558 a detail of leader pipe and downspout with underground outlet 17 558 b detail of leader pipe and downspout with splash pad 18.
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Determine peak runoff from each roof for the design storm selected.
Innovative woodworker jeremy broun undertakes repairs to his roof keeping costs down high up.
To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3.
Please note always use a safety harness barrier.