Roofing Perimeter Fastening Patterns are the Number One Reason Roofing Systems Fail If Not Followed By your Contractor
*For Factory Mutual insured or FM Compliant projects and perimeter and corner attachments, please refer to FM Global Property Loss Prevention Data Sheets or
FM’s Roof Nav website at www.RoofNav.com.
When FM 1-90 guidelines are not required, wind uplift calculations should be done to determine whether a more appropriate uplift pressure (1-60 or 1-75) is better
suited for that specific building and geographical location per ANCE/SPRI Wind design standard practice for roofing assemblies. See www.Spri.org. This will permit
prescriptive enhancements to be allowed in place of installing systems that have been tested to the pressures specified in the FM Global Loss Prevention Data Sheet 1-29
