All canales and or scuppers must have a metal pan lining extending not less than 6 inches.
Fm global roof drainage requirements.
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.
1 6 the distance between roof drains plus the distance the roof drain is from the wall divided by 4.
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.
Refer to the nrca roofing manual and fm global property loss prevention data sheets.
Roofnav i s recommended for the selection of fm approved roof assemblies.
Crickets are to be dimensioned on the drawings.
Reference fm global data sheet 1 54 3.
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.
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.
Install wood cants that are not pressure treated against decay around parapet perimeters.
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.
Design live load of the roof.
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.
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.
Always round up to 4 intervals for maximum material usage.
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.
The research is also used to enhance external standards and codes.
For guidelines on designing roof drainage systems see fm global s ds 1 54 roof loads for new construction data sheet.
Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most.
