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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.

_© I

4”,(TYP.) SIDE FLAPS

©-

I ©-

-©

EQUALLY SPACED

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.

M-

I ©

I ®

4”,(TYP.) SIDE FLAPS

©-

I ®

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.