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What Is The Difference Between Different Kinds Of Composite Decking?

Cheap decking frequently translates to “extra cost.” It is inexpensive due to “poor quality materials.” If you do not invest in a high-quality deck, you will be compelled to replace it in a few years since it failed to satisfy your expectations. So, what are the differences between the many types of komposittrall on the market, and what should I look for when selecting the proper product for my project?

What causes low-cost decking to fail?

Wood and plastic are combined to create composite decking. It’s crucial to have the correct mix of high-quality wood fibers and high-density polymers. If you’ve ever left softwoods outside, you’ll see that they quickly absorb water, expand, split, and decay. A tougher wood or treated timber will endure longer if left outside. The same may be said for composite decking. Softwood timber powders and fibres are frequently used in low-cost composite decking. These absorb moisture much like ordinary softwood timbers, causing boards to expand and fracture. Worse, they’re combined with low-cost, low-grade PVCs and low-density polymers (typically shopping bag grade plastics).

composite decking

Remember those 1980s PVC window frames? These windows began to discolor, distort, fracture, and finally fail after becoming ecologically destructive throughout their manufacturing process. Because these polymers are not UV stable, when they are exposed to sunlight, the UV radiation breaks down the polymer bonds, causing them to yellow and become brittle. On low-quality decking, the same thing happens. Low-cost polymers will brittle, fracture, and fail. The colored boards will also fade fast, making them appear worn and exhausted. The deck only collapses after 18 to 2 years due to the swelling of the wood powder and fibers.

Which is better: solid or hollow boards?

What is the purpose of hollow boards? Is this only for the sake of saving money and weight? Yes and no are the answers. It all depends on the sort of board profile you’re making, which we’ll get into later. But, first and foremost, why aren’t all composite boards solid?

Capped Solid Board

Solid boards are available and are frequently supplied as the most costly or premium variants of a composite decking line. Solid boards are frequently offered for commercial usages, such as in locations with a lot of foot traffic. These boards have difficulty holding up to high foot traffic. This relates to temperature variations, which are one of the most common factors in the UK. The material expands under heat, as we saw this summer during the hottest times. Rails buckle, electricity wires fall, doors expand and jam, and so on. When it becomes too cold, spaces between rails widen, electrical cables tighten and shatter, and openings around doors widen, allowing drafts and cold to enter.

Capped Solid Board

Composite decking is in the same boat. If the deck is built in the winter, the boards will expand and last longer in the summer. Any gaps close, and if the gaps close too tightly, the boards rise, distort, and twist. When boards are put when they are warm, gaps expand in the cold, making the deck appear ill-fitting. The quantity of material that may expand is reduced when a board is hollow. This implies that the hollow boards’ expansion and shrinkage are reduced, making the board more stable through time and temperature variations. Reduce the amount of material used in manufacturing to save money and weight, but at the expense of strength.

The cheapest, worst-performing composite boards usually have thin walls and a rectangular hollow. Over time, these will divide and fail. To counteract this, a balance must be struck between wall strength and expansion. Boards with circular hollows are the greatest design on the market. The round holes, like the arch of a bridge, enable the uniform distribution of weights, resulting in a stronger board. The perforations will also allow for less expansion and contraction since any expansion will be contained inside its own voids. This results in a sturdy board that won’t expand, buckle, twist, or warp in the heat.

What is the difference between capped and uncapped composite boards?

Capped Komposittrall, commonly known as co-extrusion, is a composite manufacturing method. This is a procedure in which a polymer “skin” is extruded alongside the composite board’s body during the forming process. This capping is colored to match the board’s completed color and contains a plastic wood composite blend that completely waterproofs the outer board and prevents moisture from entering the board’s body. Water absorbed in a composite deck can cause the wood content in the boards to expand, warping and misshaping the boards. This causes the deck board to come loose from its clips or splinter in screwed-on regions. These uncapped boards will not decay, but if they are not waterproof, they may fail.

A wood-grained look decking may also be used as a nonslip deck thanks to the capping. In damp conditions, natural wood decking and composite boards that absorb moisture become slick. It’s not the surface water that makes the surface slippery; it’s the slimy algae and moss growth from damp decks that cause a slipping danger. The Better works as a non-slip surface by removing moisture from the board utilizing capping.


Make sure non-capped boards have a thick non-slip grain or ribbed texture while utilizing them. Verify if the boards are constructed of high-density polyethylene and hardwood fibers. This will ensure that the board is secure and will last for many years. Although all deck surfaces must be kept clean, capped and high-grade composites are always advised to lessen the amount of care required.

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