How To Frame Floors 3



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Laying Out And Installing Floor Joists

Layout and install the floor joists. See figure 22. Layout the boxing or header joists on both long walls first. Joists should be cut so they join on the centre of a floor joist. Lay out the floor joists positions on the sill plate. If the floor joists are placed at 400 mm (16.5 inches) centres, the outside edge of the first joist will be at 380 mm (15.25 inches). If the joists are butted to a beam or load bearing wall, the layout is the same on both sides.  If the joists are lapped, the layout of the joist and sheathing plywood on one side will be reduced by the thickness of one joist. Setup and plumb a boxing joist on one side. Toenail it to the exterior side of the sill plate with 82 mm nails, midway between floor joist centres. Setup, plumb and nail the floor joists on that side; then do the same for the other side. Leave the floor opening framing until last. According to the BC Building Code 1998, Page 346, Table 9.23.3.4, the floor joist should be toe nailed to the plate with two 82 mm (3.25 inch) nails and the header joist should be end nailed to the floor joist with five 82 mm (3.25 inch) nails. Remember that too few nails used will weaken the structure, and too many nails will probably breakup the structure and weaken it. 

                               Figure 22   Floor Joist Layout On Boxing Joists And Floor Joists On Sill Plate           





                                      
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                                                                Framing Floors Links

                                                     1.Framing Floors: Fasten The Sill Plate To The Foundation Wall With Anchor Bolts.
                                                     2.Framing Floors: Fasten Joists & Beams After Determining The Correct Spans.
                                                     3.Framing Floors: Layout & Install The Floor Joists.
                                                     4.Framing Floors: Frame Any Floor Openings.
                                                     5.Framing Floors: Frame Any L Shaped Floor Openings.
                                                     6.Framing Floors: Install Cross Bridging Or Blocking.
                                                     7.Framing Floors: Apply A Plywood Panel Subfloor To The Floor Joists.







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Ronald Hunter
           
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