Parallel Chord Wood Roof Trusses

The partial scissor truss is similar except that the bottom chord slopes up in one direction and then straight down while the remaining portion is flat.

Parallel chord wood roof trusses. The offset scissor truss has a bottom chord that is flat for a distance and then is vaulted up and back down. Trusses must be designed for any special loading such as concentrated loads. U the truss depths and lumber sizes listed are minimums. Wood roof and floor trusses but mitek fabricators also.

Deeper trusses and larger lumber sizes aid in fire endurance and are therefore permitted. Bottom chord dead load 5 psf. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. The same thing is true for the bridge of the truss.

U rated assemblies with parallel chord trusses in floor ceiling applications may also be used for roof ceiling applications as long as the minimum depth at end bearing is maintained. Parallel chord tusses 7 sj300 415 sj300 565 a mm 210 210 d mm 170 170 h mm w mm w mm 50 500 700 100 340 480 150 150 200 fixing to top plate each msj swj sj must be fixed onto its supporting plate bearer with a minimum of 2 nails through the side of the chord into the top plate beam lintel or other timber member. 4 x 4 chord pre splice block joint details roof floor truss manual 7 31 08 10 43 am page 11. Other floor and roof loading conditions a variety of species and other lumber grades are available.

Overhang the extension of the top chord of a truss beyond the heel measured horizontally. Top chord dead load 10 psf. The more complex the truss framework is the greater quantity of these joints will be required. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70.

For a parallel chord truss vaulted gable roof with an 8 12 slope a total horizontal span of 27ft and a snow load of 42psf what would be the truss depth and lumber size required. I found numbers for a 40psf snow load flat parallel chord truss spanning 27ft with 18 depth and 2x6 top chord and 2x4 bottom chord. Pct abbreviation for parallel chord truss the truss plate institute tpi specification designation for trusses with parallel chords and 4x2 chord orientation titled design specification for metal plate connected parallel chord 4x2 wood trusses. Center line chase 24 max.

72 5 0 mi ni m u m girder floor truss. Parallel chord scissor truss design cinici roof truss ing guide at menards roof truss ing guide at menards parallel chord pallet trusses natural building blog truss question for vaulted ceilings. Parallel chord trusses allow for greater interior clearance in buildings.