How To Frame Floors 2



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Fastening Joists And Beams After Determining Their Correct Spans

If the floor joists are to be supported by a built up wood beam with supporting posts, or a load bearing wall; refer to the beam span and joist span tables in the building code to determine the correct size and spans of the beams and joists. See figure 21 for joist and beam spans and dimensions. If the floor joists are to cover a floor 8 metres (26.25 Feet) wide and 8 metres (26.25 Feet) long, Pages 413 and 426 of the BC Building Code 1998 will give the correct joist and beam span lengths. If a joist on page 413, Table A-1, Maximum Span For Floor Joists; made out of number 1 spruce, with a size of  38 by 235 mm, with strapping, and a joist spacing of  300 mm is chosen; the joist span would be 4.17 metres. Page 426, Table A-8, Maximum Spans For Built Up Floor Beams Supporting Not More Than One Floor; will give the correct beam span. If spruce select structural, with a beam size of 4 - 38 by 235 mm, supported length of  4.2 metres is chosen; the beam span would be 4.10 metres. One post would be needed to support the beam half way across the length of the floor. 

Figure 21                                 Joist And Beam Spans, And Bearing Dimensions                                                            






                                       
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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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