4x Lumber Spline
A single piece of 4x or engineered lumber standing between two structural insulated panels, for a joint that carries more load than a 2x spline.
Details
Category: Framed Walls › SIP Walls › SIP Splines
By Huu Khanh Nguyen · Updated November 4, 2026
Parameters
| Name | Default | Unit |
|---|---|---|
| Length | 8 * 12 * 25.4 | mm |
| Panel thickness | 6.5 * 25.4 | mm |
| Finish | white | |
| Joint clearance | 1.75 * 25.4 | mm |