Secondary emergency roof drains or scuppers are required according to ipc to prevent a rainwater build up.
Secondary roof drain code requirements.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
Imc 307 2 3 states that all hvac equipment that produces condensate must have either a secondary drain line or a condensate overflow switch a secondary drain pan with a secondary drain line or condensate switch or some combination of these installations should be used to prevent overflow if the primary drain line blocks.
Exception 1 of section 1511 1 states existing roofs do not have to meet the requirements of the code if positive drainage is provided.
The uniform plumbing code followed a similar path to incorporating secondary drainage requirements.
Hydraulic loads from roofs or paved surfaces 1 except as provided in sentence 2 the hydraulic load in litres from a roof or paved surface is the maximum 15 min rainfall determined in conformance with mmah supplementary standard sb 1 climatic and seismic data multiplied by the sum of.
The code defines the term positive drainage similarly to nrca providing for drainage of the roof within 48 hours of precipitation.
The rationale for not requiring secondary drainage is that if positive drainage is provided that is adequate to drain the roof.
Prior to the 1994 upc the only mention of secondary roof drains is a listing of the materials to be utilized for over flow drains in the 1994 upc rainwater systems was included as appendix d to the code.
When a secondary roof drainage system is installed it shall discharge independent of the primary building storm system and shall terminate a minimum of 18 above grade in an area that will be visible to the people who occupy the building.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
A second exception applies to existing build ings that do not have secondary roof drainage provisions such as overflow drains and overflow 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.
Part a d1 1 d notes that.
The ontario building code hydraulic loads from roofs or paved surfaces 7 4 10 4.
The inlet elevation of secondary overflow drains and the invert elevation of overflow scuppers should be not less than 2 inches 51 mm or more than 4 inches 102 mm.
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The minimum slope the code allows is in 12 in.
In these instances new secondary drain.
