Flex Base Fastening User Manual

FLEX MEMBRANE INTERNATIONAL

PH-800-969-0108 FX-610-91 6-951 0 WWW.FLEXROOFINGSYSTEMS.COM

FLEX BASE SHEET FASTENING GUIDE 7-7-7

IMPORTANT NOTE: Fastener density and spacing vary depending on applicable
uplift requirements. Local codes, governing approval bodies, membrane
manufacturers, and individual roofdeck manufacturers all may have specific
requirements that need to be addressed prior to beginning any roof project.
These illustrations depict typical Factory Mutual Approved fastening patterns
widely accepted for use by membrane and roofdeck manufacturers.

FIELD ATTACHMENT

This pattern calls for fasteners 7” on
center in the side laps and 7” on

center in two staggered rows
between the side laps. When
fastening meter—wide material with
this pattern, expect to use
approximately 174 fasteners per
square.

PERIMETER ATTACHMENT

The defined perimeter area has an
increased fastener density of 70%.

This perimeter pattern calls for
fasteners 5.5” on center in the side
laps and 5.5” on center in three

staggered rows between the side
laps. When fastening meter—wide
material with this pattern, expect to
use approximately 296 fasteners per
square.

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SHEET FASTENERS

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5.5’

CORNER ATTACHMENT

The corner areas have an increased
fstener density of 160%.
This corner pattern calls for fasteners

4.5” on center in the side laps and

4.5” on center in four staggered rows
between the side laps. When
fastening meter—wide material with
this pattern, expect to use
approximately 452 fasteners per
square.

4.5

EQUALLY SPACED

4”,(TYP.) SIDE FLAPS

FLEX CR BASE
SHEET FASTENERS