Roof Trusses

How high would a truss have to be to span 33 feet 9 inches?

Would you please inform me of the specified requirements of the size and the amount of nail attachments from the truss to the top plate?

I am a professional engineer looking for information concerning the failure of metal plate connected wood trusses and methods of repair. I am looking for this information with regard to developing recommendations for the repair of truss systems in the floor structures of two-story multi-family dwellings. I see frequent failure of truss systems of this type in both in bending and due to catastrophic failure at the gussets.

What are the requirements on the permanent bracing of bottom chords? Can gypsum board diaphragms be used?

I am a structural engineer on a project with a wood trussed roof. I have noticed some variations in the peak height in a run of identical trusses. Do you have any information on tolerances for the final dimensions of manufactured trusses?

What type of wood is usually used for wood trusses? I live in Louisiana and I would guess pine, but I want to make sure.

Are there any associations that have recommendations for the installation of wood trusses?

Are there any typical wood truss span tables for roofs and floors available? Standard framing details for use in preliminary design?

The lumber used in most metal plate connected wood trusses is either visually- or mechanically-graded solid sawn dimensional lumber. However, the Truss Plate Institute's ANSI/TPI 1 allows the use of structural composite lumber (SCL) products such as laminated veneer lumber (LVL), laminated strand lumber (LSL) and parallel strand lumber (PSL). These engineered wood products can conceivably compete with sawn lumber and complement it in truss designs.

I am planning a 36 ft. x 60 ft. clear-span horse barn with posts set 12 ft. O.C. If I use 2x6 verses 2x4 wood trusses what would the proper spacing be? The roofing is 29 ga. K-panels metal with insulation, and winter snowfall is minimal in our area.