150 mm on center in the field of the roof use two of the same deck welds or fasteners in the same deck rib in the perimeter fm 1 29 2 2 3 4.
Fm global roof deck attachment.
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.
3 2 mm but less than or equal to 0 375 in.
In general fm approved decks include.
In january fm global significantly re vised its property loss prevention data sheet 1 29 roof deck securement and above deck roof components this data sheet is intended to provide fm global s recommendations for secure ment of roof decks to roof structures and the proper design and installation of above deck roof components insula tion membrane you need to be aware of the revisions because they may affect roof system design and limit the use of some products and systems.
Steel deck performance is qualified by fm approval standard for steel deck 4451.
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The support fastener pattern should be determined for the type of fastener desired using the rdnp determined above.
Fm global s loss prevention data sheet 1 29 roof deck securement and above deck roof components issued february 2020 provides guidelines for steel roof deck attachment for fm insured buildings.
These values are in reference to mechanically attached insulation cover boards under.
1 5 1 2 0 91 and 0 75 mm thick steel roof deck to supporting steel thicknesses of greater than or equal to 0 125 in.
The performance of an insulated steel deck roof depends in part on all components in the roof system makeup and on how they interact.
Factory mutual fm attachment layout examples.
If a specific fastening detail is required every 6 in.
The research is also used to enhance external standards and codes.
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.
Fm 1 29 s section 2 2 3 4 indicates one of two approaches a performance based approach or a prescriptive enhancement approach can be used.
Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most.
The information listed in the chart below is for use with the referenced roof deck fastener type minimum pullout values and required penetration depths based on fasteners type.
Steel 22 gauge and heavier.
If a building is fm global insured and has a nonconforming deck type such as half inch plywood fm global will work with the building owner designer to find an acceptable roof cover for that project.
Roof cover performance is evaluated in accordance with fm approval standard for class 1 roof covers 4470.
