Quote Originally Posted by Phil Phelps
Check your lumber yard for Glu-lam beam.
As near as I can tell, Phil, Glulam is used more in the context of a supporting beam, not as floor joists. I'm sure you probably could use them as floor joists, but that would probably be prohibitively expensive.

For those that don't know the difference, an I-joist is basically two pieces of yellow pine (or similar), maybe 2x2 or 2x3, laid flat, with a vertical section of OSB between them, to form the shape of an "I". On the other hand, a 4"x12" Glulam would look like a stack of 6 2"x4"s glue together by their faces, running parallel.

I-joist:
http://www.apawood.org/level_b.cfm?content=prd_joi_main

Glulam:
http://www.rosboro.com/glulam.asp