Installation Guide

55
16 in. O.C. maximum
Leave a minimum 1/8 in. gap between the siding and trim, then caulk.
finish nailing
pattern
plywood or
OSB sheathing
water-resistive
barrier
1 in. from
ends
Figure 11
Use 2 in. minimum 16 ga. finish nails to attach HardieTrim NT3 boards to wood frame construction. ET&F or equivalent fasteners or screws may be used to attach
HardieTrim NT3 boards to steel frame construction.
Fastening instructions are similar for all applications. When using finish nails, position nails no closer than 1/2 in. from the edges of the trim and for all other fasteners
no closer than 3/4 in. Fasteners must be no closer than 1 in. from ends of trim and spaced a maximum of 16 in. O.C. Ensure trim is adequately fastened.
James Hardie recommends using stainless steel finish nails when installing HardieTrim products.
Use a 2 in. finish nail to fasten trim together. Longer finish nails may bend.
Minimum fastener guide for finish nailing:
4 in.
6 in.
8 in.
12 in.
Site Built Corners
2 nails every 16 in.
3 nails every 16 in.
4 nails every 16 in.
Other areas (e.g. window
trim, and band boards)
2 nails every 16 in.
3 nails every 16 in.
3 nails every 16 in.
Pre-built corner
1 nail every 16 in. to attach boards
together + 1 nail every 16 in. each board
1 nail every 16 in. to attach boards
together + 2 nails every 16 in. each board
-
-
Face Nailing Requirements
Vertical trim may be installed
with a 1/4 in. min. clearance*.
TR1510_P3/9 03/15
*Follow all applicable codes when installing HardieTrim boards
FASTENING
Fasteners must be corrosion resistant, galvanized, or stainless steel.
Electro-galvanized are acceptable but may exhibit premature corrosion.
James Hardie recommends the use of quality, hot-dipped galvanized
nails. James Hardie is not responsible for the corrosion resistance of
fasteners. Stainless steel fasteners are recommended when installing
James Hardie products near the ocean, large bodies of water, or in very
humid climates.
General Fastening Requirements Pneumatic Fastening
James Hardie products can be hand nailed or fastened with a pneumatic tool.
Pneumatic fastening is highly recommended. Set air pressure so that the
fastener is driven snug with the surface of the trim. A flush mount attachment
on the pneumatic tool is recommended. This will help control the depth the
nail is driven. If setting the nail depth proves difficult, choose a setting that
under drives the nail. (Drive under driven nails snug with a smooth faced
hammer - Does not apply for installation to steel framing).
Manufacturers of ACQ and CA preservative-treated wood recommend
spacer materials or other physical barriers to prevent direct contact of
ACQ or CA preservative-treated wood and aluminum products.
Fasteners used to attach HardieTrim Tabs to preservative-treated wood
shall be of hot dipped zinc-coated galvanized steel or stainless steel
and in accordance to 2009 IRC R317.3 or 2009 IBC 2304.9.5.”
Figure B
Siding Nail
do not
under
drive nails
Figure A
Finish Nail
Flush Snug Flush
do not over
drive siding
nails