According the diagram above - the safe loads for 4x4 Douglas Fir-Larch Columns with lengths 7.5 feet (2.5 m) are approximately 8 kips (35.6 kN, 3624 kgf).
Deflection and stress, moment of inertia, section modulus and technical information of beams and columns.
Calculate angles with a straight board across carpenter's square.
Calculate buckling of columns.
Common sizing of glue-laminated timber.
Grading of lumber in North America
Calculate miter saw protractor angles for skirting and decorative mouldings work.
Allowable withdrawal load for nail and spikes.
Strength classes, bending stress and mean density of hardwood and softwood
Allowable concentric loads for steel pipe columns.
Trees species and relative water demand.
Height of trees commonly used in towns and urban areas.
Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength.
The density of wood versus moisture content.
Bending and compression strength of wood species used in beams.
Weight supported by a double or triple wood headers.
Densities of various wood species - apple, ash, cedar, elm and more.
Density, fibre stress, compressive strength and modulus of elasticity of clear wood, panel and structural timber products.
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