Parallel Chord Wood Roof Trusses

Parallel chord trusses allow for greater interior clearance in buildings.

Parallel chord wood roof trusses.

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. 72 5 0 mi ni m u m girder floor truss. 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. 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.

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. 1 b t c center deflection truss depth truss depth spacing limit. Trusses must be designed for any special loading such as concentrated loads. U the truss depths and lumber sizes listed are minimums.

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. Top chord dead load 10 psf. Center line chase 24 max. 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.

The more complex the truss framework is the greater quantity of these joints will be required. Overhang the extension of the top chord of a truss beyond the heel measured horizontally. Bottom chord dead load 5 psf. And parallel to floor truss span strongback lateral supports 24 max.

Deeper trusses and larger lumber sizes aid in fire endurance and are therefore permitted. The same thing is true for the bridge of the truss. Wood roof and floor trusses but mitek fabricators also. 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.

Other floor and roof loading conditions a variety of species and other lumber grades are available. 4 x 4 chord pre splice block joint details roof floor truss manual 7 31 08 10 43 am page 11. 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.