Installation Guide

FASCIA
Do not use HardieTrim to replace any structural component
HardieTrim
boards can be fastened directly over a 2x sub-fascia or directly to rather tails. Check local building code for relevant codes.
Option 1
Over sub-fascia: (figure 19)
When installing HardieTrim boards over solid 2x sub-fascia use minimum 2 in., 16 gauge corrosion resistant finish nails. (see fastener guide below)
Figure 19
roof
sheathing
roof framing
roofing
roof underlayment
drip edge flashing
HardieTrim board
sub fascia
HardieSoffit Panel
HardieTrim
Board
6 in.
8 in.
10 in.
Over 2x Sub-fascia
(Minimum 2 in. 16 ga. Finish nails)
FASTENER SPACING
Direct to Rafter
(min 8d siding)
2 nails every rafter spaced max
24 in. O.C.
3 nails every rafter spaced max
24 in. O.C.
2 nails spaced maximum
16 in. O.C.
3 nails spaced maximum
16 in. O.C.
4 nails spaced maximum
16 in. O.C.
Figure 20
Roofing
Roof
Underlayment
Style "D"
dripedge
Flashing
HardieTrim NT3
Board
HardieSoffit
Panel
Roof Framing
Roof
Sheathing
Gutters:
James Hardie recommends the use of rain gutters whenever possible.
Do not attach gutters directly to HardieTrim
Use gutter hangers that attach through the roof sheathing into a rafter
tail or other structural member.
Soffit
When installing HardieSoffit additional framing/blocking may be
needed depending on application. Refer to HardieSoffit installation
instructions for guidance.
Fascia Fastener Guide
Visit jameshardiepros.com for the most recent version.
TR1510_P6/9 09/19
HardieTrim
®
Boards
Option 2
Direct to rafter tails: (figure 20)
When installing HardieTrim NT3 boards without the presence of a 2x sub-fascia, a minimum 8d siding corrosion resistant nails must be used to attach HardieTrim NT3 boards
DO NOT use finish nails. (refer to fastener guide below).