Flex Base Fastening 9-18-18 User Manual
Flex membrane international
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FLEX MEMBRANE INTERNATIONAL
PH-800-969-0108
FX-61 0-91 6-951 0
FLEX BASE SHEET FASTENING GUIDE 9-18-18
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 9” on
center in the side laps and 18” on
center in two staggered rows between
the side laps. When fastening
meter—wide material with this pattern,
expect to use approximately 90
fasteners per square.
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EQUALLY SPACED
18’
18’
FLEX CR BASE
MEET FASTENERS
PERIMETER ATTACHMENT
The defined perimeter area has an
increased fastener density of 70%.
This perimeter pattern calls for
fasteners 6” on center in the side
laps and 9” on center in three
staggered rows between the side
laps. When fastening meter—wide
material with this pattern, expect to
use approximately 158 fasteners per
square.
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EQUALLY SPACED
4.5’
9”
FLEX CR BASE
SHEET FASTENERS
CORNER ATTACHMENT
The corner areas have an increased
fstener density of 160%.
This corner pattern calls for fasteners
7” on center in the side laps and 7”
on center in four staggered rows
between the side laps. When
fastening meter—wide material with
this pattern, expect to use
approximately 232 fasteners per
square.