CertClad | Bevelback Cavity System | Radiata Pine | Installation Manual
© ITI Timspec Ltd | BC-RP-IM-V5 | CertClad is a registered Trademark of ITI Timspec Ltd
Last Updated March 2021
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WITHIN-BOARD JOINS (SCARF JOINT)
Use a within-board joint to join two shorter weatherboards together, to cover full wall width.
10.1 LIMITATIONS
A within-board join should not be placed where it is directly adjacent to another join, a junction, a corner or
a penetration i.e. stagger joins across the wall.
10.2 METHOD
Weatherboards may be joined by scarfing two boards together over a batten. Cut boards with a minimum
30-degree angle. Use an appropriate adhesive to bond the boards together and nail through the
overlapping board only. The nail should be 30mm from the edge of the join to avoid hitting the underlapping
board. Care should be taken to select and use two boards that are similar in grain and appearance, and
that have equal moisture contents; otherwise, one board may shrink or expand at a differing rate putting
stress on the joint.
