Durability for Composite Decking Materials

Characteristics

• Composite decking usually consists of wood fibers and polyethylene plastic, according to Brent Gwatney, a vice president for Moisture Shield composite decking. The plastic helps protect the wood fibers from moisture, and the wood reinforces the plastic to increase its strength. Gwatney asserts in a Green Lodging News article that composite decking materials are firm and resist cracking, splintering and twisting. Composite materials can bear heavy foot traffic and last two to three times longer than some wood decking, according to Gwatney.

Wood Fibers

• In his online Ask the Builder column, Tim Carter doesn't rule out using composite decking materials, but he warns homeowners that even the highest-quality composite materials present significant problems. Carter indicates the wood fibers in the decking may eventually rise to the surface and become discolored as they’re exposed to the elements. The fibers also can rot as they soak up moisture, according to Carter.

Product Complaints

• The U.S. Consumer Product Safety Commission announced a recall of about 48 million feet of composite decking by Lousiana-Pacific Corp. in 2009. The commission indicated that premature deterioration of the decking led to it breaking unexpectedly, which caused some people to fall. In 2008, "Consumer Reports" noted a lawsuit was filed against two other companies due to complaints about the growth of mold and mildew on composite decking. However, Carter asserts that all decking requires maintenance, so homeowners should wash composite decking periodically to remove dirt and prevent mold and mildew.

Pretesting

• The density and strength of composite decking varies. Some varieties dent easily if objects fall on them, so Carter recommends buying one piece of the composite decking you want to install to test its durability. For example, drop garden tools and other objects on the sample piece, and take note of any damage that occurs. Significant damage to the sample is an indication that the decking probably won't last long.