A treatise on architecture and building construction . Fig. .31. 110. Trininiei Beams.—Where a chimney occurs inthe side wall or in the cerfler of a building, it is necessary toframe the floorbeams in such a manner that no woodenbeam shall come within 4 inches of the brickwork enclosinga chimney flue. This is accomplished as shown in Fig. 32,the method of framing and the joints required having beenalready described. When there is to be a fireplace openingand hearth in front of the chimney, the header a, Fig. 33,should be placed from 1 ft. 9 in. to 2 ft. 6 in. away from thechimney breast, in or
A treatise on architecture and building construction . Fig. .31. 110. Trininiei Beams.—Where a chimney occurs inthe side wall or in the cerfler of a building, it is necessary toframe the floorbeams in such a manner that no woodenbeam shall come within 4 inches of the brickwork enclosinga chimney flue. This is accomplished as shown in Fig. 32,the method of framing and the joints required having beenalready described. When there is to be a fireplace openingand hearth in front of the chimney, the header a, Fig. 33,should be placed from 1 ft. 9 in. to 2 ft. 6 in. away from thechimney breast, in order to provide room for a trimmer arch,as shown at a, in Fig. 80. This method of framing with headers, trimmers, and tail-beams is also used around the openings for stairs, skylights,dormers, and dumb-waiter shafts. In all cases the header aand the trimmers d, Fig. 32, are made at least twice, orthree times the thickness of the regular floorbeams b and /-, 54 CARPENTRY. 9 as upon these trimmers is imposed the combined load of allthe tail-beams Fig. 32. 111. Flooring is applied directly to the top of the joists,after they have been brought to a true alinement, as abovedescribed, and is plain or matched, single or double, as thecase and character of the building requires. A plain floor consists simply of second quality boardsnailed directly to the floorbeams, each plank being from G 10 in. in breadth, and forming a butt joint with its neigh-bor. Such a primitive floor is seldom used except in tem-porary stnictures. A matched floor is laid with selected material which hasbeen matched, or tongned and grooved, as shown in Fig. matching, though formerly worked entirely by hand,can now be done by machinery at the mill where the inate-rial is cut up from the seasoned timber, and matched flooringis a commercial article purchasable at any hmiber yard. 11^. Matched floor boards, when laid, arc about f of aninch narrower than the width at which they are purchased. §9 C
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
