Lvl Beam In Attic . Section modulus for a wooden beam = (beam width * (beam depth)^2) / 6. The 2x6 ceiling joists are currently sistered together overtop of the load bearing wall. How To Install Lvl Beam In Attic New Images Beam from www.enhancestyleteam.com Strap them together and add kickers down to the floor system to brace the top flange of the new beam. However, the application of such a beam in the construction industry is significantly declined now. Prep the walls to receive the beams.