Re: Treated wood & Corrosion...
Pressure treated ply doesn't prevent rot? Many boatbuilders use Greenwood ply for stringers and floors. They warranty against rot for lifetime. <br /><br />Greenwood Products marine ply info...<br /> <br />XL® panels have been used in North America since 1985 and have proven themselves in virtually millions of boats, both large and small. The product has since expanded into applications such as bus floors, manure spreaders and permanent wood foundations- and not just in North America. <br /><br /><br />XL® Panels essentially deprive wood destroying organisms of one of the four needed components for them to survive. XL® treated wood robs the organisms of the plywood panels as a food source.<br /><br />The CCA treating process used in manufacturing XL® Panels results in the chemicals becoming chemically altered within the wood, becoming insoluble, or fixed.<br /><br />XL® Panels are easy to work with, with the material delivered dry without residual wetness associated with other preservative treatment methods. Contact Greenwood Products for specific information or technical support.<br /><br /> Specifications <br />Preservative: Chromated Copper Arsenate - Oxide formulation or equal.<br /><br />Sizes: Standard thickness 1/4" through 1 1/2" in full 4' x 8' sheets. Also available in most widths and lengths up to and including 8' wide by 50' long.<br /><br />Glue Bond: Marine-type high solid content exterior glue.<br /><br />Surface: Tight-knotted high grade C face and back.<br /><br />Moisture Content: Kiln dried after treating in a controlled environment to 13 percent or less to assure uniform stability and flatness.<br /><br />Estimated Shipping Weight: 4'x 8' sheets. <br />1/4" 24 lbs.. per sheet<br />3/8" 31 lbs.. per sheet<br />1/2" 43 lbs.. per sheet<br />5/8" 54 lbs.. per sheet<br />3/4" 64 lbs.. per sheet<br />1" 82 lbs.. per sheet<br />1-1/2" 131 lbs.. per sheet<br /><br />Identification: Each panel will be stamped with the XL® seal of quality and year of manufacture.<br /><br />Warranty<br />The XL® preservative treating process allows designers and other industrial specifiers to take advantage of the benefits of structural plywood without the fear of decay. <br /><br />Decay in wood (often referred to as "dry rot") occurs when fungi encounter the following conditions. Remove any one and decay cannot take place.<br /><br />The presence of moisture or high humidity<br />Typically wood that is 20% moisture content or less is not susceptible to decay. Components in boats often exceed 20% due to rain or direct contact with water, such as in bilge areas and carpeted decking. In many regions of the world, high atmospheric humidity has a tendency to accelerate decay in wood, if not properly addressed. Where water from washing a bus floor is trapped between the rubber or vinyl flooring and the plywood, rot is a factor, and a given in areas of high humidity.<br /><br />Food for the fungi (wood).<br /><br />Oxygen (wood, in deep water for instance, will not rot due to the lack of oxygen).<br /><br />A supportive temperature. Fungi, for instance, become dormant or non-existent in sub-zero temperatures.
