Fm Global Roof Drainage Requirements

Refer to the nrca roofing manual and fm global property loss prevention data sheets.

Fm global roof drainage requirements.

For guidelines on designing roof drainage systems see fm global s ds 1 54 roof loads for new construction data sheet. 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. 1 6 the distance between roof drains plus the distance the roof drain is from the wall divided by 4. 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.

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. This section contains reports that are generated to update national and international codes and standards. Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most. Since reroofing represents roughly seventy percent of the roofing contracts in the market each year we ll use it as a case study to illustrate the detailed knowledge required to meet factory mutual standards.

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. Always round up to 4 intervals for maximum material usage. Install wood cants that are not pressure treated against decay around parapet perimeters. Crickets are to be dimensioned on the drawings.

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. 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. The research is also used to enhance external standards and codes. All canales and or scuppers must have a metal pan lining extending not less than 6 inches.

Design live load of the roof. Roofnav i s recommended for the selection of fm approved roof assemblies. 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.