Installation Guide

111
HORIZONTAL JOINT TREATMENT
In some applications such as
multi-story structures or at gable
ends, it may be necessary to stack
HardiePanel
®
siding. The horizontal
joints created between panels must
be flashed properly to minimize
water penetration. Treat horizontal
panel joints by using one of the
following methods:
1) After installing the lower course
of panel siding, install vinyl or
coated aluminum “Z” flashing at
the top edge of the panel. Make
sure that the flashing is sloped
away from the wall and does not
rest flat on the top edge of the
panel. Install the second level
or gable panels leaving a
1
/4-in.
minimum gap between the
bottom of the panel and the Z
flashing. This gap should never
be caulked.
2) As an alternative, if a horizontal
band board is used at the
horizontal joint, flashing must
extend over the panel edge and
trim attachment. Flashing for
both treatments must slip behind
the water-resistive barrier.
TIP: For the most symmetrical looking wall,
plan the installation so that a full panel is
centered on the wall or gable with equal-size
panels cut for each end. As an alternative,
plan the installation so that a full panel is
located on either side of the wall center,
again leaving equal-size panels on each
end. These strategies might entail a center-
ed framing layout. Choose the strategy that
looks the best and uses material most efficiently.
TIP: For best looking installation of HardiePanel Select Sierra 8
siding, carefully align vertical panel grooves at 1st to 2nd story or
gable junctures.
WARNING
Do not bridge floors with panel siding. A horizontal
joint should always be created between floors.
!
General
Product
Information
Working
Safely
Tools for
Cutting and
Fastening
General
Installation
Requirements
General
Fastener
Requirements
Finishing and
Maintenance
HardieTrim
®
Boards/Battens
HardieWrap®
Weather Barrier
HardieSoffit
®
Panels
HardiePlank
®
Lap Siding
HardieShingle
®
Siding
HardiePanel®
Vertical Siding
Appendix/
Glossary
ESR-1844 &
2290 Report
12.7
12.8
Water-resistive
barrier
Flashing
Upper panel
Lower panel
Decorative
band board
Water-resistive
barrier
Flashing
Upper panel
6mm (¼
in.) Gap
6mm (¼
in.) Gap
Don’t caulk gap
between ashing
and upper panel.
Don’t caulk
gap between
ashing and
upper panel.
Water-resistive barrier
Upper panel
Upper panel
Lower panel
Lower panel
Decorative
band board
1 Simple horizontal joint
2 Band-board joint
Water-resistive barrier