P 1503 4 roof drainage.
Secondary roof drainage design.
Considering the damage water can do when allowed to pond on roofs and overflow from gutters it is clear that ignoring roof drainage issues can lead to urgent problems.
In either case the discharge shall be located so that it is readily visible by building occupants.
Roof drainage systems tend to be given little attention until they fail.
From the very dawn of building construction it has been necessary to incorporate some method of gathering and discharging rainwater from the roof of a structure.
Why is roof drainage so important.
P 1503 4 1 secondary emergency overflow drains or scuppers.
Secondary emergency roof drain systems shall be sized in accordance with section 1106 based on the rainfall rate for which the primary system is sized.
There are 3000 roof collapses a year in the.
The secondary roof drains can be of two types roof drains with an independent piping system or roof drains that combine with the primary roof drainage piping which will require an increase in piping size.
The drainage system shall incorporate adequate cleanouts placed in a manner that the drainage system may be readily cleaned.
Generally the roof system is more durable.
Secondary drainage shall be provided through the use of sidewall scuppers or internal roof drains.
Roof drainage is one of the fundamental considerations of building design.
Firstly there is an explanation in the above referenced section for where and why a secondary roof drainage system must be provided.
Secondary emergency roof drains or scuppers are required according to ipc to prevent a rainwater build up.
Otherwise the system will not adhere to the above referenced principle.
Adequate drainage is an important component of a properly installed roof so installing the correct size of drains is essential.
Design and installation of roof drainage systems shall comply with section 1503 of this code and sections 1106 and 1108 as applicable of the international plumbing code.
See section 1107 for yourself.
Roof collapses are prevented if primary and secondary drainage systems are designed properly.
When installing a secondary roof drainage system a licensed plumber must adhere to the following provisions issued by the board.
Better to design appropriate drainage assemblies and address incipient concerns now than.
Scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1101 7 scuppers shall have an opening dimension of not less than 4 inches 102 mm.
Ponding instability is avoided.
It s very short and to the point.
Once the required rainfall data has been determined the primary and secondary roof drainage system must be sized in accordance with.
Example of a primary secondary thru wall drainage to downspout courtesy of ernie s gutter.
