Literature Guides TrusJoist SturdiStep Stair Stringers and Treads for strong, stable stairs that resists bowing, shrinking, and splitting. Specifier’s Guide for TJ-4000 – Featuring Trus Joist TJI Joists for Floor and Roof Applications Specifier’s Guide for Beams, Headers, and Columns Installation Guide for Floor and Roof Framing Specifier’s Guide #OSB-4000 – Featuring Edge and Edge Gold Floor Panels Technical Bulletin 20″, 22″ and 24″ Deep Depth Beam Design Guide 2018-04-17