What this detail covers
- Using a solid timber post/spline to connect two SIP panels.
- Where built-up (2‑ply) splines are permitted, adhesive is mandatory.
Key steps
- Confirm the specified spline type (single solid timber or 2‑ply built-up).
- Apply a continuous bead of PU adhesive to mating faces before assembly.
- Install fixings as per the nailing/fixing schedule to clamp and align the joint.
Checks
- Spline is fully seated and aligned before final fixing.
- Adhesive line is continuous (no dry gaps).
- Joint faces are flush to accept internal linings/external layers.
Common mistakes
- Missing adhesive on built-up sections (weak + leaky joint).
- Fixings too close to panel edges causing breakout.
Indicative only: always follow the engineer’s fixing schedule and the project drawings.