Description
You usually need two or three planks per RSJ. Each plank has a chamfer at one end. Run a plank vertically down each side of your RSJ with this chamfer pointing down. Cut these to the depth of your RSJ, plus 35mm (to allow for the thickness of the plank that will run on the underside). On the underside run a plank horizontally, with the chamfer cut away (you can use an offcut from a vertical).
Length: 4000mm
Width: 345mm
Thickness: 35mm
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