Technical Specifications
ESR-1668
|
Most Widely Accepted and Trusted Page 8 of 9
ITEM 1: Allowable axial load for a wall assembly constructed with Allura™ fiber cement Lap Siding and for a wall assembly constructed with Allura™
fiber cement Vertical Siding must be determined in accordance with the applicable code.
ITEM 2: Continuous vapor barrier in accordance with the applicable code and the manufacturer's instructions.
ITEM 3: Interior side of wall assembly must be covered with
5
/
8
-inch-thick ASTM C36-95b Type X gypsum wall board. Wall board must be fastened to
wood framing with 1
5
/
8
-inch-long No. 6 Type W drywall screws spaced 8 inches on center at the edges and 12 inches in center in the field. All
screw heads must be covered with joint compound and all wallboard joints must be covered with joint compound and taped and treated with
joint compound. Joint compound must comply with ASTM C474 and C475.
ITEM 4: Insulation must be provided and must be either mineral wool or fiberglass. Mineral wool must have a nominal density of 2.5 lbs/ft
3
. The
fiberglass must be R13. Batts must be 16 inches wide.
ITEM 5: Exterior side of wall assembly must be covered with
5
/
8
-inch-thick ASTM C79-95 Type X gypsum sheathing. Gypsum sheathing must be
fastened to wood framing with 1
5
/
8
-inch-long No. 6 Type S drywall screws spaced 8 inches on center at the edges and 12 inches on center in
the field.
ITEM 6: Weather-resistive barrier in accordance with this report and the applicable code.
ITEM 7: Exterior wall covering must be either Allura™ fiber cement Lap Siding or Allura™ fiber cement Vertical Siding. Where Lap siding is utilized the
overlap must be a minimum of 1
1
/
4
inches and face fastened with 2
1
/
2
-inch-long double hot-dipped galvanized roofing fasteners with a head
diameter per Table 2. The fastening schedule for Allura™ Fiber Cement Vertical Siding must be a maximum of 6 inches o.c. at the edges and
12 inches o.c. in the field with 8d common nails.
For SI: 1 inch = 25.4 mm; 1 lbf = 4.448 N.
FIGURE 1—ONE-HOUR FIRE-RESISTANCE-RATED WALL ASSEMBLY
FOR ALLURA™ FIBER CEMENT LAP AND VERTICAL SIDING