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Basic Bearer & Joists Calculations The following two slides will help you understand the calculation process for Bearer & Joist Calculations First look at the information provided, then simply click your mouse to bring in each point. Created by M. S. Martin October 2007

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Formula: Number of Bearers = Width of Building+ 1 Bearer Spacings Click your mouse to reveal each step in the calculation. Allow for bearers to run the long way of the building. Width of Building+ 1 Bearer Spacings 5.400+ 1 1.800 = 3 + 1 = 4 in total Refer to the sketch & keep clicking your mouse to see how this works Your timber order will have to indicate orderable lengths, and bearers must join over a pier, so Order for this job in 3.6m lengths, multiples of 1.8m (pier spacings – see picture & click mouse again Final order = 8 @ 3.6m 100 x 75 HWD 5.400 7.200 Below is a basic single room dwelling as an example for these bearer & joist calculations Spec: –100 x 75 HWD Bearer @ 1.8m centres –100 x 50 HWD Joists @ 0.450 centres 1 2 3 + 1 = 4 Bearers

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Formula: Number of Joists = ( Length of Room + 1 ) + double joists Spacing of Joist Click your mouse to reveal each step in the calculation. Allow for Joists to run the shortest way of the building ( Length of Room + 1 ) + double joists Spacing of Joist ( 7.000 + 1 ) + 2 (note we deduct 0.450 wall frame width) ( 16 + 1 ) + 2 = 17 + 2 = 19 Joists Refer to the sketch & keep clicking your mouse to see how this works 5.400 7.200 Below is a basic single room dwelling as an example for these bearer & joist calculations Spec: –100 x 75 HWD Bearer @ 1.8m centres –100 x 50 HWD Joists @ 0.450 centres –100 x 50 Oregon wall frame 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 +1 = 17 + 2 = 19 Joists Your total timber order will be 19 @ 5.400m 100 x 75 HWD

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