Roof Truss Span Tables - Locke Truss Home - …

1 roof Truss span Tables15 alpine Engineered ProductsTop Chord2x4 2x6 2x62x4 2x6 2x62x4 2x6 2x62x4 2x6 2x6 Bottom Chord2x4 2x4 2x62x4 2x4 2x62x4 2x4 2x62x4 2x4 2x62 *465869*496674*536680*6/124660* 69*4767* 71*5174* 76*5574* 82*7/124767* 70*48* 72* 72*52* 77* 77*56* 80* 83*2 *344151*364654*394658*4/12354152*3645* 54*3950* 58*42* 49* 62* Other pitch combinations available with these spansFor Example, a 5/12 - 2/12 combination has approx. the same allowable span as a 6/12 - 3/12 Top Chord2x4 2x6 2x62x4 2x6 2x62x4 2x6 2x62x4 2x6 2x6 Bottom Chord2x4 2x4 2x62x4 2x4 2x62x4 2x4 2x62x4 2x4 2x616"232425 25 25 25 25 25 25 25 25 25 18"252728272729 29 29 29 29 29 29 20"272830282832313033 323133 24"29303331313534333835344028"3232363433 3937364238374430"33333835354038374440394 532"34343936364239394541404736"363642393 84542414843435042"3939454141484444524546 5448"40424943445246475646495860"44475546 495848536349556572"455160485464515768515 969 = span Limited by length to depth ratio of 24 PitchDepthSpans in feet to out of bearingSpans in feet to out of bearing5/1238*47* 57*39* 51* 59*42* 56* 63*45* 54* 68*6/12 - 2/12 404359*424962*4556* 664857* 71*6/12 - 373852384457*415061*445266*6/12.

2 3/12 333345353852384356*404660*6/12 - 2828383232443437503639546/12 - 4/12 222231262636303041323244 alpine Truss designs areengineered to meet specificspan, configuration and loadconditions. The shapes andspans shown here representonly a fraction of themillions of designs processedby alpine load(PSF)Duration factorLive load(PSF) roof **shingle**constructionor rain,not snow rain or load(PSF)Duration factorLive load(PSF)NOTES:These overall spans are based on NDS91 with 4" nominal bearing each end, 24" , a live load deflection limited to L/240maximum and use lumber properties as follows:2x4 f =2000 psi f =1100 psi E= 2x6f =1750psi f =950 psi f =1900 psi E= . Allowablespans for 2x4 top chord trusses using sheathingother than plywood ( spaced sheathing or 1xboards) may be reduced slightly. Trusses mustbe designed for any special loading such asconcentrated loads from hanging partitions or airconditioning units, and snow loads caused bydrifting near parapet or slide-off from higher achieve maximum indicated spans, trussesmay require six or more panels.

3 Trusses with anasterisk (*) that exceed 14' in height may beshipped in two pieces. Contact your local Alpinetruss manufacturer or office for more configurations for themost widely designed roof where the roof is required toslope only in one direction. Also in pairswith their high ends abutting onextremely long spans with asupport underneaththe high a cathedral orvaulted ceiling. Most economical when thedifference in slope between the top andbottom chords is at least 3/12 or the bottomchord pitch is no more than half the top most economical flat Truss for aroof is provided when the depth of the Truss ininches is approximately equal to 7% of thespan in inches.