The better choice if it can be accommodated is one of the first two methods where overflow at the exterior of the building roof is provided without the need for secondary drainage piping.
Secondary roofing system.
Ata truss atas secondary framing members are used for secondary framing members to support it s panel systems in roof wall and soffit applications.
Low slope roofing includes water impermeable or weatherproof types of roof membranes installed on slopes less than or equal to 3 12 14 degrees.
A secondary water barrier is the layer of material that is placed directly on the roof deck under the primary outer roof covering of shingles tile metal etc.
Roof system types roof systems and materials generally are divided into generic classifications.
In addition secondary framing members may be used in retro fit roofing applications to create newly applied slope to an existing flat roof.
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 secondary roof drains shall connect to the vertical piping of the primary storm drainage conductor downstream of the last horizontal offset located below the roof.
Here are a few reasons why floridians find that building codes often require them to add this component to their roofing system.
This system shall be compliant with all federal state and local codes.
Components include hat u and sub girt type members.