Cyclopedia of architecture, carpentry, and building : a general reference work . ir d ^ =r - ^/ :.« ^ 4^ ? .Wii J. S|DJ94D-| ujo|4og ..:,tll9|DJ94D-| dqi ROOF TRUSSES 63 then BL3, and finally BL2, all of which are shown on the Markingor Erection Diagram. Care should be taken to give each piece that is different fromothers in any w^ay whatsoever, a different mark. For instance, thepurlins are the same size, and differ only in length and on account ofthe fact that one has holes in the bottom flange (see Plate III). Plate IV gives the roof marking and erection diagram for theroof trusses o
Cyclopedia of architecture, carpentry, and building : a general reference work . ir d ^ =r - ^/ :.« ^ 4^ ? .Wii J. S|DJ94D-| ujo|4og ..:,tll9|DJ94D-| dqi ROOF TRUSSES 63 then BL3, and finally BL2, all of which are shown on the Markingor Erection Diagram. Care should be taken to give each piece that is different fromothers in any w^ay whatsoever, a different mark. For instance, thepurlins are the same size, and differ only in length and on account ofthe fact that one has holes in the bottom flange (see Plate III). Plate IV gives the roof marking and erection diagram for theroof trusses of Plates II and III. Note that the roof truss onPlates II and III is not the same as that of which Plate I is astress sheet. 17. Estimate of Cost. A rough estimate of the cost of steel inthe roof may be obtained by multiplying the weight of the purlins,in pounds, by 2^ cents; then adding to this the result obtained bymultiplying the weight of all the steel in the trusses and the bracingby 3 J cents. This will give the cost of the steel work in place withtwo coats of paint. This will give the cost closely enough
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Keywords: ., bo, bookcentury1900, booksubjectarchitecture, booksubjectbuilding
