Plywood as a building material is very widely used due to its many useful properties. . ... No exposed plywood face or edge can survive immersion or exposure to water unprotected. a lot. Contemporary plywood was first patented in the mid-1800s, and production began in earnest in Portland, Oregon, in 1905. I still plan on installing a lino or laminate floor over the plywood once finished. Be sure to put a heavy weight on top of the tarp so that it does not blow off during the storm. In the UK it rains, as you know. ... is oer about 25-30 years old. The plywood was very wet when purchased and installed wet like most PT woods. Plywood is made up of thin layers of laminated softwood, held together by strong, adhesive glue. It is 3/4" pressure-treated Doug Fir plywood over P-T framing. Please see "Proper Handling" below for tips on preventing swelling. No mold yet. A. Shingle roofs are installed every day over wood decking that has been wet by rain. ... (who is also our builder) thought that it likely had something to do with water absorbption during the wet season...when the framing dried, it contracted, squishing the nails out, etc. Generally, plywood roof decking that has gotten wet and had … Best way to check - see if it dries out during dry periods and get wet again onunderside of the sheathing in rains. When exposed to moisture, the wooden layers can swell or deform. Does 3/4" tongue and grove CDX plywood get damaged from rain water when the home is under construction. Not in standard platform construction. This is not a decay issue, but swelling can cause other difficulties in construction. How to Protect Plywood From Water Damage. As for the glue bond, it weakens when the wood stays wet for a prolonged period, and the layers can separate eventually. It is an economical, factory-produced sheet of wood with precise dimensions that does not warp or crack with changes in atmospheric moisture. Plywood is one of the most commonly used construction materials in the residential and commercial areas. Ply is an engineered wood product made from three or … I plan on erecting walls when I return in the Spring. Many types of lumbered materials take on water damage if they are not covered with a tarp during heavy rainstorms. Replace? No ceiling leaks.. 2 layers of shingles. I built a 12'x20' shed foundation on the Oregon coast last Summer. Today, builders can choose from several types of exterior plywood. Building Construction; ... Birch plywood is a suitable alternative in wet area applications. Roof problems may have started with wet plywood Originally published April 28, 2012 at 5:00 am Updated April 28, 2012 at 7:01 am Home Fix: Dwight Barnett answers home … Exterior plywood came on the scene in 1934 with the development of a waterproof adhesive. - Answered by a verified Home Improvement Expert We use cookies to give you the best possible experience on our website. 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