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.

Respective responsibilities of the roofing contractor the factory mutual system and the material supplier in specifications containing factory mutual requirements 16 august 1972 ever since the advent of factory mutual requirements in certain roofing specifications some confusion has existed as to the respective responsibilities of the roofer factory mutual and the material supplier. Factory mutual metal deck span limits tw structural op. 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. 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.

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. Fm 1 9 roof anchorage for older wood roofed buildings changed the title to roof anchorage for older wood roofed building from roof anchorage. 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. This will apply for zone 1.

New factory mutual design guidelines spur debate at the international roofing show. 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. Factory mutual recently made changes that updated the loss prevention data sheets as it pertains to roofing industry.

Nrca takes its popular energywise roof calculator online. The following are some of the most important changes. Restrained assembly rating type of protection classified deck type u l.