Figure 6-21.—Rabbet-and-groove-jointed treads and risers.Treads and risers should be nailed to stringers with6d, 8d, or 10d finish nails, depending on the thicknessof the stock,INTERIOR DOORFRAMINGLEARNING OBJECTIVE: Upon completingthis section, you should be able to describe theprocedures for laying out and installinginterior dooframes, doors, and the hardwareused.Rough openings for interior doors are usuallyframed to be 3 inches higher than the door height and2 1/2 inches wider than the door width. This providesfor the frame and its plumbing and leveling in theopening. Interior doorframes are made up of two sidejambs, a head jamb, and the stop moldings upon whichthe door closes. The most common of these jambs is theone-piece type (shown in fig. 6-23, view A). Jambs canbe obtained in standard 5 1/4 inch widths for plasterwalls and 4 5/8 inch widths for walls with 1/2-inchdrywall finish. The two- and three-piece adjustablejambs (views B and C) are also standard types. Theirprincipal advantage is in being adaptable to a variety ofwall thicknesses.Some manufacturers produce interior doorframeswith the doors fitted and prehung, ready for installing.Installation of the casing completes the job. When usedwith two- or three-piece jambs, casings can even beinstalled at the factory.Figure 6-22.—Joining a baluster to the tread.finish stringers (see fig. 6-20). Treads and risers areoften rabbet-jointed as in figure 6-21.Vertical members that support a stairway handrailare called balusters. Figure 6-22 shows a method ofjoining balusters to treads. Here, dowels, shaped on thelower ends of the balusters, are glued into holes boredin the treads.Stringers should be toenailed to stairwell doubleheaders with 10d nails, three to each side of the stringer.Those which face against trimmer joists should each benailed to the joists with at least three 16d nails. At thebottom, a stringer should be toenailed with 10d nails,four to each side, driven into the subflooring and, ifpossible, into a joist below.Figure 6-23.—Interior door framing parts.6-15
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