Cyclopedia of architecture, carpentry, and building : a general reference work . light into the building, part of theroof of buildings over SO feetwide must be made of glass, sincethe amount of light admitted from the sides of the building isnot sufficient to light up those parts of the shop near the centerof the trusses. In some cases the saw-toothed truss is used, inwhich case the entire surface of the short rafter is covered with case the ordinary triangular roof truss is used, a portion of theroof covering must be made of glass, so put on as to prevent leakageand also to prevent t
Cyclopedia of architecture, carpentry, and building : a general reference work . light into the building, part of theroof of buildings over SO feetwide must be made of glass, sincethe amount of light admitted from the sides of the building isnot sufficient to light up those parts of the shop near the centerof the trusses. In some cases the saw-toothed truss is used, inwhich case the entire surface of the short rafter is covered with case the ordinary triangular roof truss is used, a portion of theroof covering must be made of glass, so put on as to prevent leakageand also to prevent the moisture which forms on the under side ofthe glass from dropping in the shop. Fig. 72 shows the glass inplace on a saw-toothed roof; and Figs. 73 and 74 give the details ofseveral methods of securing glass on the roof so that no leakage orcondensation will get onto the shop floor. The glass area should befrom -jV to J of the floor area. 13. Specifications for Roof Trusses and Steel Buildings. In caseof an important structure, special specifications are written, embody- 256. 44 ROOF TRUSSES ing certain fea-tures which theexperience of theengineer in chargeindicates as neces-sary. For ordi-nary structures,however, severalvery satisfactoryspecifications areon the consist offrom 15 to 20pages, bound inpaper, and maybe had for twenty-five cents a very satis-factory specifica-tions are those ofCharles EvanFowler and Milo Eithermay be had by addressing the Engineering News Publishing Company,New York City. Fowlers specifications, in addition to giving speci-fications for load stresses and workmanship, give much valuable in-formation regarding the stressesin different kinds of trusses, be-sides various details showing theuse of corrugated steel. An extended set of specifica-tions is not required for the de-sign of ordinary roof trusses. Inaddition to the information re-garding the weight of trusses, the weight of roof covering, the snowload, and the
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Keywords: ., bo, bookcentury1900, booksubjectarchitecture, booksubjectbuilding
