Cyclopedia of architecture, carpentry, and building : a general reference work . w fe c« ROOF TRUSSES Pitch Normal Wind Pressure J 34 pounds per square foot. 30° 32 i 30 1 2G j^ 90 iC it U it ti *^ If the normal pressure on a roof making any other angle with the hori-zontal is desired, see Statics, p. 24. The determination of these vakies is based for the most part ondata obtained by experiment. In the computations relative to thedesign of buildings, the wind is usually assumed to exert a pressureon the walls of 30 pounds per square foot. The snowfall For Pacific Coastand Arid Regions useone-h
Cyclopedia of architecture, carpentry, and building : a general reference work . w fe c« ROOF TRUSSES Pitch Normal Wind Pressure J 34 pounds per square foot. 30° 32 i 30 1 2G j^ 90 iC it U it ti *^ If the normal pressure on a roof making any other angle with the hori-zontal is desired, see Statics, p. 24. The determination of these vakies is based for the most part ondata obtained by experiment. In the computations relative to thedesign of buildings, the wind is usually assumed to exert a pressureon the walls of 30 pounds per square foot. The snowfall For Pacific Coastand Arid Regions useone-half tabular values. 40Lotitudc in Degrees. Fiff. 8. Unit Snow Loads. varies with the lo-cality. The heav-iest snow loadswhich come upon aroof are not alwaysin the locality ofthe heaviest snow-fall, since a compar-atively light snow-fall may occur, andif this is followedby wind and sleet,the result will be aload greatly in ex-cess of the snowfall itself. The snow load per square foot of roofsurface varies with the pitch of the roof, and will be greater thesmaller the pitch. The ice and sleet will be comparatively 8* gives values of snow and sleet loads which are recommendedfor use. It is customary to figure the snow load by taking it as somuch per square foot of horizontal projection. EXAMPLES FOR PRACTICE 1. Compute the wind panel load on a roof whose pitch is \,and whose panel length is 15 feet, the distance between trusses being16 feet. 2. Compute the snow panel load for the truss of Problem 1, above. *Keteliums Steel Mill Buildings, p. 11. 219 6 KOOF TRUSSES 4. Weights of Roof Trusses. T
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