Types of waterproofing. many types of waterproofing are available to protect plywood. the most common type sold in home improvement stores is the paint-on or spray-on type of waterproofing.. Often the subfloor consists of plywood that is nailed or screwed to the construction floor. before finish flooring is installed on top of a plywood subfloor, you must waterproof the subfloor, especially in a bathroom. if you do not waterproof the subfloor, moisture can make its way under the subfloor and cause mold growth or other damage.. The liquid rubber canada waterproof sealant can be applied on the inside of the entire tank. the waterproof sealant is an excellent choice to waterproof an aquarium. it has 100% waterproofing ability and excellent adhesion to give a completely seamless membrane..
Pt plywood (the grade you are talking about) is pretty darn water resistant and you have two things going to help it even more.... 1. putting it on the slope will really help the water drain off (paint the backside about 6" up from the bottom and all edges of the plywood) 2.. Plywood is an important and stable building material, comprised of many different veneers glued together at right angles. these layers provide dimensional stability, but leave the edges, which expose all of the laminate sections, particularly vulnerable to water damage.. To waterproof wood, start by sanding it with fine grit sandpaper to remove any imperfections and prep the surface. then, use a rag to apply an even coat of linseed oil, walnut oil, or tung oil to the wood and let it cure for 24 hours. repeat the process 2 more times so there are 3 coats of oil on the wood..
