Figure 2-71.—Permanent lateral bracing in a truss.Step 1.Step 2.Step 3.Position the first roof truss. Fasten it to thedouble top plate with toenails or metalanchor brackets. A 2- by 2-inch backerpiece is sometimes used for additionalsupport.Fasten two 2 by 4 braces to the roof truss.Drive stakes at the lower ends of the twobraces. Plumb the truss and fasten thelower ends of the braces to the stakesdriven into the ground.Position the remaining roof trusses. Aseach truss is set in place, fasten a lateralbrace to tie it to the preceding trusses. Use1 by 4 or 2 by 4 material for lateral braces.They should overlap a minimum of threetrusses. On larger roofs, diagonal bracingshould be placed at 20-foot intervals.The temporary bracing is removed as the roofB. Metal bracket.sheathing is nailed. Properly nailed plywood sheathingis sufficient to tie together the top chords of the trusses.Permanent lateral bracing of 1- by 4-inch material isrecommended at the bottom chords (fig. 2-71). Thebraces are tied to the end walls and spaced 10 feet OC.Anchoring TrussesWhen fastening trusses, you must considerresistance to uplift stresses as well as thrust. Trusses arefastened to the outside walls with nails or framinganchors. The ring-shank nail provides a simpleconnection that resists wind uplift forces. Toe nailing issometimes done, but this is not always the mostsatisfactory method. The heel gusset and a plywoodgusset or metal gusset plate are located at the wall plateand make toenailing difficult. However, two 10d nailson each side of the truss (fig. 2-72, view A) can be usedFigure 2-72.—Fastening trusses to the plate: A. Toenailing;in nailing the lower chord to the plate. Predrilling maybe necessary to prevent splitting. Because of thesingle-member thickness of the truss and the presenceof gussets at the wall plates, it is usually a good idea touse some type of metal connector to supplement thetoenailings.The same types of metal anchors (fig. 2-72, view B)used to tie regular rafters to the outside walls are equallyeffective for fastening the ends of the truss. The bracketsare nailed to the wall plates at the side and top with 8dnails and to the lower chords of the truss with 6d or1 1/2-inch rooting nails.INTERIOR PARTITION INSTALLATIONWhere partitions run parallel to, but between, thebottom truss chords, and the partitions are erected beforethe ceiling finish is applied, install 2- by 4-inch blocking2-44
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business