Roof Uplift Requirements

Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc.

Roof uplift requirements.

Decra roofs also have the resilience and durability to withstand the most challenging wind conditions even in florida s. Wind uplift ratings are a critical safety metric for building and testing roof systems for superior wind performance. Decra roofing profiles use a unique interlocking system high strength fasteners with documented pull out resistance and lab tested installation procedures to verify that our roofs provide wind uplift resistance far beyond the limits of conventional roofing materials. Wind uplift is a near constant force on roofs with wind movement from zero to over 170 mph.

Let s assume that the calculations for our building require a roof that can withstand 23 pounds per square foot of uplift force in the field of the roof. As a result most nailing patterns in high wind areas require 8d nails at a maximum of 6 inch spacing along all framing members. Design and performance requirements there are three tests ul 580 ul 1897 and astm e1592 that are used to determine a metal roof s uplift rating. Testing of panel uplift resistance following hurricane andrew led to significant changes in prescriptive roof sheathing nailing requirements throughout much of the u s.

These roof deck types are steel minimum 22 gauge wood cementitious wood fiber plank and structural concrete minimum 2 500 psi.