Product Details - Eastern Stringer
The below diagram and chart shows engineered Unsupported Stringer Lengths for Ply-Lam as an Eastern (or Cut-Out) Stringer.
In the below diagram and chart, the Thickness (W) and Effective Depth (ED) of the stringer are adjusted based on the required unsupported length.
The chart below uses the above indices and shows the Alberta Building Code Permitted Unsupported Length. All measurements are given in Inches:
| Product Code |
Thickness (Width - W) |
Effective Depth (ED) |
AB Code Permitted Unsupported Length |
| Spruce 2x12, Cut Out, 5.25" remaining | 1.5 | 5.25 | 99 |
| Spruce 2x10, Cut out, 3.5" remaining | 1.5 | 3.5 |
69 |
| PL3 C 3.5 | 1.125 | 3.5 |
55 |
| PL3 C 5.25 | 1.125 | 5.25 |
78 |
| PL3 C 8.625 | 1.125 | 8.625 |
135 |
| PL4 C 3.5 | 1.5 | 3.5 |
60 |
| PL4 C 4.625 | 1.5 | 4.625 |
80 |
| PL4 C 5.25 | 1.5 | 5.25 |
86 |
| PL4 C 8.625 | 1.5 | 8.625 |
148 |
| PL6 C 3.5 | 2.25 | 3.5 |
71 |
| PL6 C 4.625 | 2.25 | 4.625 |
95 |
| PL6 C 5.25 | 2.25 | 5.25 |
107 |
| PL6 C 8.625 | 2.25 | 8.625 |
177 |
| PL8 C 3.5 | 3 | 3.5 |
76 |
| PL8 C 4.625 | 3 | 4.625 |
101 |
| PL8 C 5.25 | 3 | 5.25 |
114 |
| PL8 C 8.625 | 3 | 8.625 |
188 |