. Fi?. 10. A A are common joists, BB trimming joists, and C a the bearing is more than seven or eight feet, the joistsshould be strutted; that is to say, short pieces of board should befitted between the joists, so as to form a continued line from w\allto wall. These struts greatly strengthen the floor, and prevent thejoists from sinking; but it is not desirable to mortice them into thejoists, as that process has the eflect of weakening the joists Fig. 11. 320 Woodwork, Carpentry, etc. Double flooring is th
. Fi?. 10. A A are common joists, BB trimming joists, and C a the bearing is more than seven or eight feet, the joistsshould be strutted; that is to say, short pieces of board should befitted between the joists, so as to form a continued line from w\allto wall. These struts greatly strengthen the floor, and prevent thejoists from sinking; but it is not desirable to mortice them into thejoists, as that process has the eflect of weakening the joists Fig. 11. 320 Woodwork, Carpentry, etc. Double flooring is that in which there are two tiers of joists, thebinding joists, as A A, in fig. 11, which in fact support the floor, andthe bridging joists B B. In this kind of flooring, the binders extendfrom wall to wall, and the bridging joists are notched down uponthem. Beneath the binders we have a third tier of timbers (D),which are pulley-morticed into the binders, and are called ceilingjoists. When the binding joists are framed into a large piece of timber,called a girder, the floor is said to be a double framed floor. Thusin fig. 12 A is the girder, B a binding joist, C a bridging joist, D D
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectenginee, bookyear1856
