architecture - engineering - construction
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Boise Cascade Engineered Wood Products
Southern Engineered Wood Products Specifier Guide
BCI Load Bearing Cantilever Details
Southern Engineered Wood Products Specifier Guide
| Southern EWP Specifier Guide - Load Bearing Cantilever Details |
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BCI Joists
| ROOF TOTAL LOAD |
30 PSF | 40 PSF | 50 PSF | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| JOIST SPACING |
16"o.c. | 19.2"o.c. | 24"o.c. | 16"o.c. | 19.2"o.c. | 24"o.c. | 16"o.c. | 19.2"o.c. | 24"o.c. | ||
| 9 1/2" BCI 40s |
Roof truss span with 2'-6" overhang |
24' | X | X | A | X | A | A | A | A | C |
| 26' | X | X | A | X | A | C | A | A | C | ||
| 28' | X | A | A | A | A | C | A | C | C | ||
| 30' | X | A | A | A | A | C | A | C | C | ||
| 32' | X | A | A | A | A | C | A | C | C | ||
| 34' | X | A | A | A | A | C | A | C | C | ||
| 36' | X | A | C | A | C | C | C | C | C | ||
| 9 1/2" BCI 45s |
Roof truss span with 2'-6" overhang |
24' | X | X | A | X | A | A | A | A | B |
| 26' | X | X | A | X | A | A | A | A | C | ||
| 28' | X | A | A | A | A | B | A | A | C | ||
| 30' | X | A | A | A | A | B | A | B | C | ||
| 32' | X | A | A | A | A | B | A | B | C | ||
| 34' | X | A | A | A | A | C | A | B | C | ||
| 36' | X | A | A | A | A | C | A | C | C | ||
| 11 7/8" BCI 40s |
Roof truss span with 2'-6" overhang |
26' | X | X | A | X | A | A | A | A | A |
| 28' | X | X | A | X | A | A | A | A | A | ||
| 30' | X | X | A | X | A | A | A | A | C | ||
| 32' | X | A | A | A | A | A | A | A | C | ||
| 34' | X | A | A | A | A | C | A | C | C | ||
| 36' | X | A | A | A | A | C | A | A | C | ||
| 38' | X | A | A | A | A | C | A | C | C | ||
| 11 7/8" BCI 45s & BCI 60s |
Roof truss span with 2'-6" overhang |
26' | X | X | A | X | A | A | A | A | A |
| 28' | X | X | A | X | A | A | A | A | A | ||
| 30' | X | X | A | X | A | A | A | A | B | ||
| 32' | X | A | A | A | A | A | A | A | B | ||
| 34' | X | A | A | A | A | B | A | A | B | ||
| 36' | X | A | A | A | A | B | A | A | B | ||
| 38' | X | A | A | A | A | B | A | B | C | ||
| 14" BCI 40s |
Roof truss span with 2'-6" overhang |
26' | X | X | A | X | X | A | X | A | A |
| 28' | X | X | A | X | A | A | A | A | A | ||
| 30' | X | X | A | X | A | A | A | A | A | ||
| 32' | X | X | A | X | A | A | A | A | C | ||
| 34' | X | X | A | A | A | A | A | A | C | ||
| 36' | X | A | A | A | A | A | A | A | C | ||
| 38' | X | A | A | A | A | A | A | A | C | ||
| 40' | X | A | A | A | A | C | A | A | C | ||
| 42' | X | A | A | A | A | C | A | C | C | ||
| 14" BCI 45s & BCI 60s |
Roof truss span with 2'-6" overhang |
26' | X | X | A | X | X | A | X | A | A |
| 28' | X | X | A | X | A | A | A | A | A | ||
| 30' | X | X | A | X | A | A | A | A | A | ||
| 32' | X | X | A | X | A | A | A | A | B | ||
| 34' | X | X | A | A | A | A | A | A | B | ||
| 36' | X | A | A | A | A | A | A | A | B | ||
| 38' | X | A | A | A | A | A | A | A | B | ||
| 40' | X | A | A | A | A | B | A | A | B | ||
| 42' | X | A | A | A | A | B | A | B | B | ||
| 16" BCI 45s & BCI 60s |
Roof truss span with 2'-6" overhang |
26' | X | X | X | X | X | A | X | A | A |
| 28' | X | X | A | X | X | A | X | A | A | ||
| 30' | X | X | A | X | A | A | A | A | A | ||
| 32' | X | X | A | X | A | A | A | A | A | ||
| 34' | X | X | A | X | A | A | A | A | B | ||
| 36' | X | X | A | A | A | A | A | A | B | ||
| 38' | X | A | A | A | A | A | A | A | B | ||
| 40' | X | A | A | A | A | A | A | A | B | ||
| 42' | X | A | A | A | A | A | A | A | B | ||
KEY TO REQUIRED REINFORCEMENT
X No reinforcement required.
A 3/4" x 48" plywood reinforcement required on one side of
joist.
B 3/4" x 48" plywood reinforcement required on two sides of
joist.
C Closer on-center spacing required.
- These requirements assume a 100 PLF wall load and apply to BCI 400, 450 and 600 Series joists. Additional support may be required for other loadings. See BC CALC program.
- Contact Boise Cascade for reinforcement requirements on BCI joist depths greater than 16".
REINFORCEMENT REQUIREMENTS
- BCI joists may be cantilevered up to a maximum of 2'-0" when supporting roof loads, but may need reinforcement. The tables and details on this page indicate the type of reinforcement required, if any.
PLYWOOD REINFORCEMENT
3/4" x 48" CDX plywood reinforcement or other 3/4" APA 48/24 rated sheathing must match the full depth of the BCI joist. Nail to the BCI joist with 8d nails at 6" o.c. and nail with 4-8d nails into backer block. When reinforcing both sides, stagger nails to avoid splitting. Install with horizontal face grain.
