Installation Guide

English | 4
WOOD FLOOR INSTALLATION (Interior application)
1 | Ensure the subfloor is structurally sound
On existing structures:
• Ensure subfloor is not damaged. Replace any loose, warped, uneven
or damaged sections of floor.
• Make certain subfloor is a clean and flat surface.
For all floors:
• Use minimum 5/8 exterior grade plywood or 23/32 OSB with Exposure
1 classification or better, complying with local building codes and ANSI
A108.11.
• Joist spacing not to exceed 24 in on center.
• The floor assembly must be engineered not to exceed the L/360 deflection
criteria (L/720 for natural stone), including live and dead design loads, for the
specific joist spacing used.
• Expansion/Control joints shall be installed per TCNA installation method
EJ171. Obtain professional advice (architect, builder or other design
professional) for joint specifications and locations.
2 | Determine the backerboard layout
• Stagger all HardieBacker
®
Cement Board with HydroDefense
™
Technology
joints. Do not align with subfloor joints.
• Never allow all four corners of
four boards to meet at one point.
• We recommend a 1/8 in. gap
between board edges.
• Keep sheet edges 1/8 in. back
from walls and cabinet bases.
• Measure, score and snap boards
to required sizes and make
necessary cutouts.
B
A
C
CORNER
A
B
C
HardieBacker
®
Cement Board
with HydroDefense
™
Technology
Mortar embedded in fiberglass
mesh tape
Wood or min. 20-gauge
(33 mils) steel studs