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Most types of wood eventually gets damaged in case of a prolonged exposure to water. However a good quality waterproof plywood is built in such a way that it offers a better degree of resistance to water, compared to natural solid wood or commercial MR grade plywood. The reason for this is that a phenolic resin (which is a synthetic plastic resin) is used for glueing all the individual plies together. Use of a such a synthetic plastic resin helps in making the plywood waterproof.
Waterproof plywood is available in all the standard sizes. The most common sizes are 8 feet by 4 feet sheets, and thickness of 18 or 19mm. Read the related article on standard plywood sizes and thickness for more information about this.
For the construction of doors, blockboard and flush doors are the preferred choice of material, instead of plywood. Flush doors have solid rectangular blocks of softwood covered on both the faces by a thin layer of ply of around 2.5 mm thickness. Flush doors are lighter in weight, cheaper and also has lesser tendency to sag and bend compared to plywood. People prefer to opt for a waterproof (BWP grade) flush door, instead of waterproof (BWR) grade plywood for their doors.
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