architecture - engineering - construction
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Boise Cascade Engineered Wood Products
Western Engineered Wood Products Specifier Guide
BCI Hole Location, Sizing & Cantilever Detail
Western Engineered Wood Products Specifier Guide
Western EWP
Specifier Guide - BCI Hole Location & Sizing
Perforated Knockouts for Ventilation or Electrical Wiring
BCI joists are manufactured with 1 1/2" round perforated knockouts in the web at approx. 12" o.c.
| MINIMUM DISTANCE (D) FROM HOLE TO ANY SUPPORT | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JOIST TYPE | ROUND HOLE SIZE | |||||||||||||
| 2" | 3" | 4" | 5" | 6" | 6 1/2" | 7" | 8" | 8 7/8" | 9" | 10" | 11" | 12" | 13" | |
| 9 1/2" BCI 400 & 450 | 1'-0" |
2'-0" |
3'-0" |
4'-0" |
5'-0" |
5'-9" |
- |
- |
- |
- |
- |
- |
- |
- |
| 11 7/8" BCI 400, 450 & 600 | 1'-0" |
2'-0" |
2'-6" |
3'-6" |
4'-0" |
4'-6" |
5'-0" |
5'-9" |
6'-9" |
- |
- |
- |
- |
- |
| 14" BCI 400, 450 & 600 | 1'-0" |
2'-0" |
2'-6" |
3'-6" |
4'-0" |
4'-6" |
5'-0" |
5'-9" |
6'-9" |
6'-9" |
7'-9" |
9'-3" |
- |
- |
| 16" BCI 450 & 600 | 1'-0" |
2'-0" |
2'-6" |
3'-6" |
4'-0" |
4'-6" |
5'-0" |
5'-6" |
6'-0" |
6'-0" |
7'-0" |
8'-0" |
9'-0" |
10'-6" |
| 18" BCI 600 | 1'-0" |
2'-0" |
2'-6" |
3'-6" |
4'-0" |
4'-6" |
5'-0" |
5'-6" |
6'-0" |
6'-0" |
7'-0" |
8'-0" |
8'-0" |
8'-0" |
| 20" BCI 600 | 1'-0" |
2'-0" |
2'-6" |
3'-6" |
4'-0" |
4'-6" |
5'-0" |
5'-6" |
6'-0" |
6'-0" |
7'-0" |
8'-0" |
8'-0" |
8'-0" |
- For multiple holes, the amount of web to be left between holes must equal twice the length of the largest adjacent hole.
- Holes may be positioned vertically anywhere within the web.
- Assumes uniformly loaded joists supporting the maximum loads shown on any table in this design guide. For other load conditions, contact your local distributor or BC CALC software.
* For rectangular holes, use longest dimensions of hole size to obtain (D) from table, then add 12".
| Non-Load Bearing Cantilever Details |
|---|
BCI joists must be protected from direct exposure to weather
