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Lumber sizes/dimensions:
The dimensions of the lumber used for this project are given in both metric and inches. All dimensions are first written in millimeters
followed by feet and/or inches encased in brackets.
Frame lumber sizes (widths and thicknesses) referred to in this project are the approximate actual sizes, that is, the size of the lumber once it has been
surfaced (dressed, planed) which is smaller than the nominal (rough) size.
For example, if you pop along to the local lumber store and ask for a length of 100x50 (2x4)lumber that is surfaced/dressed on all sides (S4S), the actual finished size will be approximately
90x45 (1 1/2x 3 1/2). You can use rough/unsurfaced (the nominal size) if you wish but allowances must be made for the extra thickness of the lumber, i.e.
adjustments for hole placements and bolt lengths must be made accordingly.
The table below shows the approximate differences between the nominal and actual sizes of framing lumber.
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METRIC
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Nominal size
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Actual size
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50x50
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45x45
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75x50
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70x45
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100x50
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90x45
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150x50
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140x45
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100x100
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90x90
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INCHES
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Nominal size
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Actual size
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2x2
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1 1/2x 1 1/2
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2x3
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1 1/2x 2 1/2
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2x4
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1 1/2x 3 1/2
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2x6
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1 1/2x 5 1/2
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4x4
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3 1/2x 3 1/2
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There are five different lumber sizes used in this project. They are:
90x90 (3 1/2x 3 1/2) for the beam and the four corner uprights
90x45 (1 1/2x 3 1/2) for the ladder
70x45 (1 1/2x 2 1/2) for the frame
45x45 (1 1/2x 1 1/2) for the ladder rungs
150x25 (1x6) for the roof and wall cladding as well as the floor
There is also 1 sheet of exterior 18mm x 2400 x 1200 (48x 96x 3/4) plywood required
All the lumber used in this project is surfaced (dressed, planed) except for the 150x25 (1x6), which is rough.
If 70x45 (1 1/2x 2 1/2) is unavailable in your area, you can rip 140x45 (1 1/2x 5 1/2) stock in half.
If 45x45 (1 1/2x 1 1/2) is unavailable in your area, you can rip 90x45 (1 1/2x 3 1/2) stock in half.
If other size lumber is used, or if unsurfaced (rough) frame lumber is used, adjustments for hole placements and bolt lengths must be made accordingly.
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