Is plastic wood cheaper than real wood?

thespruce.com - Plastic Wood Deck Lumber - What to Know Before You Buy - The Spruce

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The pleasures of having a wood deck on your house are counterbalanced by deck maintenance. Wood deteriorates—it's just a natural thing. Deck maintenance is all about slowing that natural process with regular staining and sealing. As exposed as they are, floorboards especially bear the brunt of the weather. Isn't there a way to slow down the deterioration more, and without all of that staining and sealing?

Plastic deck lumber is one of the best alternatives to traditional wood decking, along with composite and aluminum decking. If you're looking for deck material that's durable, low-maintenance, and never needs to be finished, plastic lumber may be right for your deck.

What Is Plastic Deck Lumber?

PVC Decking

The type of deck lumber often called plastic lumber is made from either recycled plastic or from new materials, typically single resin polyethylene (HDPE and LPDE), polystyrene, or polyvinyl chloride (PVC). PVC plastic decking appeared on the building material market in the late 1980s and is available in dimensions similar to traditional lumber. Plastic lumber has other applications besides decking, include trim boards, railings, outdoor furniture, siding, and fences. One thing you cannot use PVC for is structural applications, so the support posts, joists, and beams of a deck must be built from a different material, usually wood. Plastic lumber has the reputation of being durable forever. Plastic lumber is durable since it does not absorb water. Since it contains no organic materials, it cannot rot. But plastic lumber does not last forever. After being exposed to the sun and other elements for long enough, plastic lumber may peel or crack. Its color will eventually fade. Unlike wood, which can be sanded and re-stained, plastic decking offers no such repair alternatives: It can only be replaced.

Composite Decking

Plastic decking is not the same thing as composite decking, which is made of plastic and wood fibers. In many cases, up to 95-percent of the plastic used is from recycled materials. Plastic decking is only plastic, although it can have any number of additives for resistance to sun damage, scratching, and weather. With composite decking, the plastics polypropylene or polyethylene link with the wood fibers for a strong bond. They also help to create a richly textured surface with color that more closely resembles wood than PVC decking.

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PVC-Wrapped (Capped) Composite Decking

A combination of PVC and composite decking, this material has a composite core that is wrapped in PVC. Sometimes, this type of deck material is called capped deck boards. The outer shell is bonded to the core under high temperatures and high pressure. Wrapped composite deck boards are better at absorbing heat than PVC deck boards. This can be a distinct advantage in hot areas, especially if you're interested in decking with darker-colored wrapped boards, which heat up more than lighter boards. One downside of wrapped composite boards is that the wrapping can be damaged, exposing the composite inner core.

Pros and Cons of Plastic Deck Lumber

Pros Waterproof

Does not rot

Resists stains

Smooth; will not splinter

Recyclable Cons Will fade

Cannot be painted or stained

Flexes easily

Slippery

Can look artificial

Pros

Plastic deck lumber can be molded into many different shapes and sizes, including curves. It is waterproof and resists rot and mold without sealants.

Plastic lumber is stain-resistant against many chemicals and substances.

Capable of being manufactured in a range of colors, plastic deck lumber has good short-term fade resistance. Plastic deck lumber does not splinter, resists insects, is 100-percent recyclable, and, unlike most wood decking, plastic lumber usually comes with a manufacturer's warranty

Cons

Plastic deck lumber is slippery, especially when wet, though embossed texturing does help with grip. Plastic deck lumber is weaker than wood and flexes easily, so more joists are required. Plastic lumber can look artificial, particularly because there are no variations in color. All the boards are of a uniform color.

Uniform texturing can lead to repetitive patterning.

The color of the plastic lumber cannot be changed. That's because the boards cannot be stained or painted (even if you want to). This can be an issue years down the road since plastic lumber is subject to fading.

Installing Plastic Deck Lumber

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Plastic lumber can be cut and drilled like wood. No special tools are required. This makes it an option for do-it-yourself installation. It can be screwed down to a wood deck structure, just like wood decking, but many types of plastic decking are designed for hidden-fastener systems that leave the top of the decking unmarred by screw heads. Keep in mind that plastic isn't able to span as far as wood, and you must provide adequate support for the decking boards. Also, leave room for the plastic boards to expand. For these and other reasons, like maintaining the warranty, it's important to follow the manufacturer's installation specifications.

Cost of Plastic Deck Lumber

Both plastic lumber and composite wood-plastic lumber cost more than wood decking. You will recoup a large portion of these upfront costs since plastic deck lumber is so low-maintenance compared to wood and likely will have a longer lifespan. Generally, plastic deck lumber will cost $9.50 to $15 per square foot, installed. Composite decking will cost around the same: $11 to 15 per square foot. For an accurate cost comparison with wood decking, factor in the cost of periodic finishing that wood decking requires. Wood decks should be re-stained or sealed every two to three years in most conditions. The cost of materials adds up, as does the labor or the time if you're doing the work yourself.

thespruce.com - Plastic Wood Deck Lumber - What to Know Before You Buy - The Spruce