Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Side by side
Incised lumber spans less
Show a hint
Incised 2x8s read from the plain column: 12 ft instead of 11 ft 5 in.
| Joist | Max span | Cantilever | Verdict |
|---|
An asterisk marks a span longer than joist stock is normally carried, so your yard may not have it.
Every number here is a working estimate. Check it with your building authority.Turn JavaScript on to work the lesson. The drawing shows how it starts.
The rule this lesson teaches
Incised treated lumber loses about 5 percent of its span, and the tables list it separately.