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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.
