. Handbook for rangers & woodsmen . roof. the rafters from sagging and makes a very strong roof. It isfrequently used in roofs having long rafters and is very effectivewhere a large anxount of snow may remain on a roof for a con-siderable period. It is not a satisfactory form of roof for barnsthe upper parts of which are to be filled with hay or other self-supporting shed roof may be constructed as shown inFig. 83. - This is known as a truss roof. Its chief disadvantage isthe extra cost of material and labor required in its construc-tion. Furthermore, the presence of the lower truss bea
. Handbook for rangers & woodsmen . roof. the rafters from sagging and makes a very strong roof. It isfrequently used in roofs having long rafters and is very effectivewhere a large anxount of snow may remain on a roof for a con-siderable period. It is not a satisfactory form of roof for barnsthe upper parts of which are to be filled with hay or other self-supporting shed roof may be constructed as shown inFig. 83. - This is known as a truss roof. Its chief disadvantage isthe extra cost of material and labor required in its construc-tion. Furthermore, the presence of the lower truss beam causesthe loss of more or less space beneath the roof. Half-frames.—^This method of construction is similar to thatused in erecting frame buildings, the only difference being in CONSTRUCTION WORK 91 the number of studding and other frame timbers used. Suchframes are used chiefly where the walls are to be boxed. Box Frames.—These have either no studding at all, or at themost only a few. Like the half-frames they are used where. Fig. 83.—Truss roof.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
