Factory Mutual Roof Deck Spans

Determine the maximum steel deck span from fm 1 29 tables 1a 1d for 1 5b decks or 1e for 3n decks for the roof covering required.

Factory mutual roof deck spans.

Restrained assembly rating type of protection classified deck type u l. Take the guesswork out of an fm approved roof roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most. New factory mutual design guidelines spur debate at the international roofing show. But i don t think i would follow the fm manual if the roof did not need to be insured by fm unless i got the ok from the owner to do so.

Factory mutual metal deck span limits tw structural op. Please note also the needed deck gage and yield strength. Class 1 75 and class 1 90 wind uplift rated insulated steel deck roof constructions when installed as described in roofnav an on line resource of fm approvals. I remember parts of the wind and live load provisions being pretty conservative over what the code required for me.

As an example graham pointed to new fm language that calls for more stringent steel deck span requirements including the use of heavier gauge deck and more bar joists. Nrca takes its popular energywise roof calculator online. Factory mutual approved gage span table 1 5 deep roof deck gage type span 22 b 6 0 20 b 6 6 18 b 7 5 subject to the conditions of approval as steel roof deck when installed as described in the current edition of the fmrc approval guide. Fm 1 9 roof anchorage for older wood roofed buildings changed the title to roof anchorage for older wood roofed building from roof anchorage.

9 1 1 nucor vulcraft group steel roof deck is secured to the building structural supports with fm approved steel deck fasteners spaced at the maximum center to center span as. Factory mutual recently made changes that updated the loss prevention data sheets as it pertains to roofing industry. The following are some of the most important changes.