There is a floor truss using plywood webs that resemble big square gusset plates and these ply 'squares' attach to 2x4 top and bottom chords. The squares alternate from side to side with a space/opening between squares for plumbing or electrical. Trouble is I can't find the specs on truss depth, length, dimensions of webs, etc. Am. Plywood Assoc./Manufactured Wood Assoc have nothing on this. Clearly, it's an easy do-it-yourself low cost item. I have to span 20 to 24 feet and want to make this part of my Truss Framed House (see freepatentsonline.com) Similar to but less cumbersome structurally than the old Rigid Frame cabin from Am Ply Assoc (old APA plan still for sale at U-bild website). The old Rigid Frame Cabin has been around for decades, updated from time to time (by Midwest Plan Service and others) and out-dated in style, but quick and cheap. This plywood web floor truss would work well with it or the better styled and more recently-invented Truss Framed House concept: a W roof truss which incorporates wall studs and floor joist truss all as one truss frame, each lifted on site by hand and sheathed with ply on roof, sides, floor resulting in a very strong but cheap per sq ft structure. I want to use the Truss Framed House concept with this ply truss floor joist at a remote site, but I can't find specs on this cheap and easy plywood webbed floor truss. Help, please, anybody. thanks (I'll take any specs/source for a diy wood floor truss anyone can provide as an alternative to the ply web truss described above).