A treatise on architecture and building construction . ry below, or wherea partition has a number of doors or other openings through CARPENTRY. 63 it so weakening it that it cannot safely carry the requiredweight to be imposed upon it. Fig. 39 shows a trussed par-tition with a door 4 ft, 6 in. X 7 ft. 6 in. in the center of sill a and the plate b are made 5 in. x 7 in. The studs cat each side of the door are 3 in, X 5 in., and the upright wallmembers g are 6 in. X 5 in. The height of the door is limitedby the 3x5 timber e, from the ends of which the 4x5braces d extend to the ends of the
A treatise on architecture and building construction . ry below, or wherea partition has a number of doors or other openings through CARPENTRY. 63 it so weakening it that it cannot safely carry the requiredweight to be imposed upon it. Fig. 39 shows a trussed par-tition with a door 4 ft, 6 in. X 7 ft. 6 in. in the center of sill a and the plate b are made 5 in. x 7 in. The studs cat each side of the door are 3 in, X 5 in., and the upright wallmembers g are 6 in. X 5 in. The height of the door is limitedby the 3x5 timber e, from the ends of which the 4x5braces d extend to the ends of the sill a, where they are let inat/ to secure them from slipping. A truss cqpr is therebyframed, around the members of which the 2x5 studs/arecut. The entire weight of this partition, together with anysuperimposed load, will come upon the points c and r, whereample support must be provided to carry the weight down toa proper foundation. 138. In Fig. 40 we have a partition with three openings,the essential difference between it and that shown in Fig. 39. Fig. 40. being that the truss is entirely above the openings, while inthe former example the opening was through the center ofthe truss. In Fig. 40 we have the sill a, into which are 64 CARPENTRY. 9 mortised the wall members^-. The tie-beam/marks the topof the openings, and into it the rafters, or struts, ^are notchedat each end, with the compression member c between theirtops. This entire truss km In is carried by the wall posts ^,and the weight of the door posts and the studs betweenthem is carried to the top of the trass through the tie-rods /,which pass, also, through the plate Jl; the weight of theentire partition is therefore carried by the corner, or wallposts g, which, in turn, must be well supported from below. 139. Door and window openings more than 3 feet wide,should have their heads trussed, as in Fig. 41, the tie-beamc resting upon the studs d^ and the struts c footed into thetie-beam. This prevents the top of the doo
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