Does Composite Decking Expand And Contract?
When the temperature fluctuates, traditional wood decking may expand and contract thermally. Composite decking is the best alternative to wood decking. So does composite decking expand and contract? Yes, composite decking boards expand and contract slightly in response to temperature changes, much like the majority of solids. It is important to note that composite wood decking has a low coefficient of thermal expansion.
Actually, this feature enhances the other advantages of premium composite decking. For instance, longevity, ease of maintenance, and consistency across boards. Furthermore, composite decking won’t expand or compress when wet like traditional wood does.
In this article, we will detail the extent to which composite decking expands and contracts. Additionally, in order to build a better outdoor deck, we need to know how to adjust the distance between deck boards.
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Table of Contents
What Leads to Composite Decking Contracting or Expanding?
When the temperature changes, most things expand and contract. This is due to the fact that molecules can travel more or less quickly. Additionally, water alters the size of boards composed of specific materials, like wood.
Causes of Expansion
Excessive temperatures cause many objects to expand. The molecules in composite decking boards migrate and clash with one another as the temperature rises, expanding the area they occupy. As a result, the decking boards will “swell” somewhat.
In addition, composite decking won’t be significantly impacted by excessive moisture, particularly if it has a PVC shell that prevents water intrusion. As a result, composite decking can withstand temperature fluctuations, rain, and snow with ease. However, because wood decking is porous, it collects water and expands when it becomes wet.
Causes of Shrinkage
Most objects shrink when the temperature of the environment decreases. Composite decking planks cool and shrink a little when the temperature drops. It is worth noting that, this shrinking is negligible.
Natural wood loses water easily in arid climates. As the wood fibers shrink, the deck dries out and cracks. Composite decking, on the other hand, is largely unaffected by moisture. As a result, it shrinks less.
How Much Does Composite Decking Expand?
The behavior of various composite decking brands and types varies with regard to expansion and contraction. Composite decking boards typically grow by 0.1% to 0.3% of their original length. It should be noted that the board’s breadth will likewise increase. No worries, it’s not a big deal for the standard vertical drainage space.
To allow the composite decking boards to stretch and contract from end to end. The manufacturer of composite decking advises leaving a gap between all butt joints and mitered joints. The temperature of the area where the decking is put will affect the recommended decking clearance.
Composite decking boards should have a 1/8-inch space at the butt joints if they are put in temperatures higher than 40°F. The gap should be 3/16 inch if the installation temperature is lower than 40°F.
The clearance of most composite decking boards is the same. Examine the specifications and instructions provided by the manufacturer. Mineral-based composite decking can be put without an expansion gap because it does not expand and contract like regular composite decking.
Should You Be Concerned About Composite Decking’s Expansion and Contraction?
Every homeowner should be aware of the performance of composite decking. You can still enjoy your outside space despite this. Just be careful to consider this when you lay your deck yourself. Asking the person building the deck what they intend to do with it is another option.
Another technique to minimize butt joints and the gaps you need to leave is to use the longest boards you can locate, which are often 16 or 20 feet. Using picture frames and vertical transition boards, sometimes referred to as “breaker boards,” is one method of minimizing end-to-end seams and gaps. This reduces the amount of dust and other debris that accumulates on your deck. Additionally, the less organic debris on the deck, the less chance there is for mold to grow.
Because composite decking materials don’t absorb as much water. So they’re ideal for use around hot tubs and pools. However, when moist, the pressure-treated wood framework beneath the deck will continue to expand and contract. Therefore, we advise you to use waterproof tape on the joists to keep moisture and water out of the deck’s substructure.
How to Put Deck Boards at the Correct Location
For proper drainage and air circulation, the majority of deck planks are spaced apart. Additionally, these spaces keep dirt, tree chips, and other debris from building up on the deck. The distance between the planks on either side is predetermined if hidden fasteners are employed.
However, you must ensure that there is sufficient expansion clearance to accommodate temperature variations where the ends of two planks meet in a butt or miter joint. If you don’t install the boards with adequate space between them. They may come into contact with each other as the temperature rises.
The boards may deform as a result of the fasteners holding them in place becoming loose. Additionally, you must install the device precisely as the manufacturer intended in order for your warranty to remain valid.
Here’s how to properly install it:
Make Use of the Proper Measurements
Accurate measurement and cutting are crucial. Measure the complete length of the space where the boards will be placed. Then take out the area you wish to leave for optimal outcomes.
Making Use of a Jig
Setting or checking plank spacing with a tape measure is laborious and imprecise. As a result, utilize jigs or spacers rather than a tape measure. You can use pencils, nails, coins, or any other hard object of appropriate thickness, or you can purchase gauges in various sizes. The distance can be changed as needed by using different thicknesses.
Think About the Weather
The length of the planks will increase in hotter temperatures. The length is shortened in colder climates. Therefore, it could be important to give the joints additional room if it’s cold outside. In warmer weather, the opposite can be required. Even in pleasant weather, direct sunshine can cause the boards to absorb more heat than you may realize.
The consideration of expansion spacing is not limited to the installation of composite decking. When installing composite fascia boards, railings, and built-ins like benches and pergolas, you should also take expansion spacing into account. The installation instructions provided by the manufacturer should also be followed while installing composite cladding, or siding.
Summarize
Composite decking materials outperform wood and PVC decking in numerous other aspects, including resistance to heat and water. For instance, they are more consistent from board to board, last longer, and require less upkeep than wood.
If you are interested in these low-maintenance composite decking materials, please contact us. Our service staff can answer your questions and provide free samples.
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