Fm Global Roof Drainage Requirements

Design live load of the roof.

Fm global roof drainage requirements.

Crickets are to be dimensioned on the drawings. Fm approved pv modules are recommended to fm global clients worldwide the hazards as energy costs rise and pressure mounts to offset or reduce greenhouse gas emissions a growing number of corporations utilities and municipalities are turning to photovoltaic pv systems to turn sunshine directly into electricity. Fm global conducts research for use in the data sheets that our engineering field staff use to support our client s efforts to protect their business. The research is also used to enhance external standards and codes.

Install wood cants that are not pressure treated against decay around parapet perimeters. Refer to the nrca roofing manual and fm global property loss prevention data sheets. Reference fm global data sheet 1 54 3. You have to sign up in order to view data sheets on the fm global website but it s free and definitely worth your time.

All canales and or scuppers must have a metal pan lining extending not less than 6 inches. 1 6 the distance between roof drains plus the distance the roof drain is from the wall divided by 4. Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation recommendations from relevant fm global property. Increasing from the 5 drain shown to a 6 drain increases the roof area that can be served by about 1 6 x the table data.

Roofnav i s recommended for the selection of fm approved roof assemblies. Dropping from the 5 drain in the table to a 3 drain cuts the serviced or drainable roof area to about 0 26 x the roof areas shown in the table. Thereby adhering to factory mutual requirements is of utmost importance when working on the roof of an fm global insured building. For guidelines on designing roof drainage systems see fm global s ds 1 54 roof loads for new construction data sheet.

A common mistake made when these documents are not followed is that roof edge fascias end up being inadequately secured says judd peterson aia president of judd allen group edina minn. Roof specifications and roofnav assembly number fm global form 2688 application for acceptance of roofing systems should be completed for each type of roof covering system for each building. Always round up to 4 intervals for maximum material usage.