Installation Guide

21
Fire-Rated Wall Assemblies
PermaBase Cement Board has been
tested and/or approved for use in a variety
of fire-rated wall systems.
1-Hour Rating – The 1-hour wall assembly consists of 3-5/8"
steel studs, 16" o.c., one layer of 7/16” PermaBase PLUS or 1/2"
PermaBase attached horizontally or vertically with 1-1/4" long cement
board screws 8" o.c. in the field and perimeter on one side and one
layer of 5/8" Fire-Shield
®
gypsum board attached vertically on opposite
side with joints staggered to those of opposite side, with 1-1/4" long
drywall screws 8" o.c. in the field and perimeter with 3" thick mineral
fiber insulation batts in the stud cavities. UL V452.
2-Hour Fire Rating – The 2-hour wall assembly consists of 3-5/8" steel
studs, 16" o.c. on one side, base layer of 1/2" Fire-Shield C or 5/8”
Fire-Shield gypsum board attached vertically with 1" drywall screws
24" o.c. in the field and perimeter and face layer of 7/16” PermaBase
PLUS or 1/2" PermaBase attached vertically with 1-5/8" cement
board screws, 8" o.c. in the field and perimeter. Two layers of 1/2"
Fire-Shield C or 5/8” Fire-Shield gypsum board applied vertically to the
opposite side, base layer attached with 1" drywall screws 24" o.c. in
the field and perimeter and face layer attached with 1-5/8" drywall
screws 12" o.c. in the field and perimeter, with 3" thick mineral fiber
insulation batts in the stud cavities. All joints staggered between face
and base layer. UL V452.
2-Hour Rating
1. PermaBase Cement Board
2. Steel studs
3. 3" mineral fiber insulation
4. 1/2" Fire-Shield C
Gypsum Board
1-Hour Rating
1. PermaBase Cement Board
2. Steel studs
3. 3" mineral fiber insulation
4. 5/8" Fire-Shield
Gypsum Board
1
2
4
3
1
2
4
4
4
3
Technical Data