Plywood grades - what do the letters mean? softwood plywood grades. the grading system for softwood plywood is one of the easier puzzles to solve when it comes to buying lumber and wood project materials - thanks to the simple a-d letter system used to indicate the quality of the panel.. There is some confusion amongst specifiers concerning the properties of exterior grade plywood. dr vic kearley of trada seeks to clarify the situation and outline improvement actions that are underway.. An exterior rating means the panels have been waterproofed and are able to withstand extended exposure to inclement weather. grades. the home depot carries four grades of plywood: a, b, c and d. a is the best and most expensive, and d the least expensive. a-grade plywood features a smooth, sanded surface without knots..
Exterior grade hardwood ply is popular for use in any application that requires a nice visual finish. this plywood is also often selected where panel stability is important. this may include applications such as substrates for stainless steel benchtops and wall and ceiling linings.. As far as water resistance, plywood that is bs1088 (or better) should be a must in order to ensure long term durability. exterior structures. while perhaps not as harsh an environment as on a boat, depending on where the structure is situated exterior plywood can take quite a beating.. Exterior grade plywood has black / dark glue lines. interior grade plywood has clear / invisible glue lines. we advise you to check your plywood stock before purchasing it so that you can feel confident that your interior plywood purchase is just that..
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