Factory Mutual Roof Deck Spans

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 loss.

Factory mutual roof deck spans.

This will apply for zone 1. 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. Please note also the needed deck gage and yield strength.

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. Fm 1 9 roof anchorage for older wood roofed buildings changed the title to roof anchorage for older wood roofed building from roof anchorage. Restrained assembly rating type of protection classified deck type u l. 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 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. New factory mutual design guidelines spur debate at the international roofing show. 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. 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.

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. 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 metal deck span limits tw structural op.