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Composite & synthetic decking choices, properties, & installation procedures. The most common type of composite decking is made of wood fibers mixed with plastic, which is then formed into planks up to 20 feet in length. Solid planking is available in 2x and 5A sizes. Some products are made to resemble real wood, at least from a distance, while others offer a range of colors. This article series describes critical safe-construction details for decks and porches, including avoiding deck or porch collapse and unsafe deck stairs and railings. Our page top photo shows several colors of synthetic decking installed at a New York building supply outlet.
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Good decks are primarily built to promote leisure and comfort, but they can require a fair bit of upkeep to keep them looking good. Composite decking has been gaining in popularity in recent years because it significantly reduces the maintenance that a deck needs from year to year.
New products are being introduced all the time, though many of them are not available in all areas or carried by all stores. If you are curious about composite decking, plan to visit as many stores as possible and do some research on the specific products available to you.
The composite deck board photo at left shows that the deck actually collapsed during work on the structure, revealing rotted wood structure over which the deck boards had been added as a "repair".
Some manufacturers have begun offering composite lumber that can be used for railings and fascia boards, giving you the opportunity to construct the most visible portions of a deck out of the same material. You may also be able to use composite lumber for stair treads and risers.
Decking made with recycled polyethylene (PE) may require shorter spans than products made with poly- vinyl chloride (PVC), which itself may not be able to span quite as much as some solid wood decking. Each product is made from a unique mix of materials, and some may fade more than others.
With a growing variety of products available and an expanding list of happy consumers, composite decking is rapidly becoming the material of choice for those seeking a low-maintenance deck. Because of its flexibility, it is also well suited to use in curved decks and even matching benches.
Watch out: synthetic decking is not a "forever" material and can deteriorate, break, even collapse as we illustrate in some photos here and as has been reported elsewhere. [citations needed]
Cutting and Drilling Composite Deck Materials
Use regular carpentry tools to cut, drill, and shape composite lumber. Fine-toothed, carbide- tipped blades work best.
Unlike wood, according to some sources composite decking does not have to be coated with a protective finish. If you are not satisfied with the color choices available, however, or if you would like your deck to match the color of your house, most products can be stained or painted. Keep in mind that if you do apply a finish, you will have to re coat the surface regularly. Some manufacturers suggest oil-based paints and stains for their products, while others recommend latex finishes.
Watch out: check the coating requirements or recommendations given by the manufacturer of the particular synthetic decking material you are choosing.
Fastening Requirements for Synthetic Decking, Trex, Plastic or Similar Products
Most composite decking can be attached with standard deck screws or nails. Some manufacturers suggest that you drill pilot holes before driving screws, others do not.
Vinyl decking is another low cost option, although one that offers a particularly nontraditional-looking deck. Installation differs as well. In general, first an aluminum or vinyl track is installed across the joists, and then top pieces are snapped into place.
Note that in this immediate discussion we have eschewed environmental and health questions concerning the use of treated wood, vinyl and other manmade products, as well as questions of renewable resources and environmental impact. Articles on those topics can be found at InspectApedia.com such as at
Sorting Synthetic Decking by Board Types: solid, webbed, other
Solid composite decking is the composite product most similar to solid wood and can be fastened accordingly. Hidden fastener systems can also be used with some products, but check with both the fastener and composite manufacturers for compatibility. Some solid composite boards may have a slight cup, which should be installed facing up to allow water to run off.
Webbed, or hollow-core, composite decking is available in both rectangular and tongue-and-groove profiles. Because of the products’ design, manufacturers specify exactly where fasteners must be driven in each board.
Shown at left is a non-solid composite decking product. This image is used with permission from Best Practices Guide to Residential Construction, by Steven Bliss, courtesy of Wiley & Sons. Also see our review of that book.
In a companion article on this topic, SYNTHETIC & COMPOSITE DECK BOARDS - Best Construction Practice, Mr. Bliss points out that the oldest solid composite decking on the market is Trex®, but competitors now include Boardwalk® (Certainteed), ChoiceDec® (Weyerhauser), and products from several smaller manufacturers
Some products are made with a surface groove to accommodate fasteners. You can buy matching caps to enclose board ends, or you can install fascia boards.
With Webbed decking, fastener placement can be particularly important. This 2 X 6 product requires that screws be driven only through the outer cores, not the center one.
Where to Buy Composite & Plastic Decking Materials
Building Supply Stores such as Home Depot & Lowes stock a variety of composite and synthetic decking products including those shown in the photographs above. At left is an image of the Veranda Composite Decking warranty.
Plastic Decking Systems
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A complete guide to building decks, porches, & exterior stairs can be found at Related Topics above. Key articles include:
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