ARCC 2202 Lecture Notes - Lecture 3: Sustainable Design, Purlin, Formaldehyde
16 Dec 2016
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Deiduous are typical harder than coniferous, however some softwoods are harder than hardwoods. Example is that basswood is softer than r. Main difference is that hardwoods have vessels and bre cells. Wood loses mechanical strength and becomes wet and spongy. Oxidation of lining causing wood to take on a white, stringy appearance. Rough sawn: exact dieentions (warming: sometimes whiten 1/8in) Dried in a kiln before cutting or milling at all. Plywood: a panel created by cross-laminating continuous sheets of wood veneer in alternating directions, each layer perpendicular to the next. Oriented strand board (osb): a panel created by bonding strands of wood in layers with adhesives. Again, the layers are cross-oriented to improve strength and stiffness. Glulams can be shaped in curves or custom shapes. Parallel strand lumber (psl): as the name suggests, it is made of strands of lumber typically long strands that are bonded with adhesive to create a strong material resistant to shape changes.
