Installation Guide

49
1
/4 in. gap
Water-resistive barrier
1
/8-in. caulked gap
is left between
siding and the side
trim pieces.
Header piece spans the
window including the side
trim pieces.
Side trim pieces go to the top
of the window.
Bottom trim piece is the
width of the window.
Starter strip
Do not caulk between the
siding and the ashing.
Flashing
WINDOW AND DOOR TRIM
Windows and doors must be installed per
the manufacturer’s instructions. Window
flanges or flashings must be properly
installed and lapped correctly under the
water-resistive barrier prior to the installation
of HardieTrim
®
5/4, 4/4 boards. Once the
HardieTrim 5/4, 4/4 boards is put on,
proper flashing must be installed above the
trim and lapped under the water-resistive
barrier correctly.
Install HardieTrim 5/4, 4/4 boards around
doors and windows using the “cap over”
method, which means that the header or
horizontal top piece of the trim extends and
caps over the vertical jamb pieces on both
sides. For windows, the bottom trim piece
or sill trim fits in between the jambs.
For cap-over trim installation:
1) Start by measuring the length of the
bottom edge of the window, not
including the flange.
2) Cut a piece of trim to that length and
install it.
3) Next measure from the bottom of the
installed trim to the top of the window.
4) Cut two pieces of trim to that length and
install them on either side of the window.
5) For the cap, measure the distance
between the outside edges of the side
trim pieces. Cut a piece of trim to length
and install it.
For doors the process is the same except
that it starts with the side pieces, step three.
Window and door trim
TIP: For trimming around windows and doors with attachment
flanges, install a shim strip to build out the wall even with the
flange. This strip lets the trim sit flat and parallel with the wall.
Shim
Window
trim
Window
ange
8.19 8.20
8.21
8.22
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