Apart from the various quality brands there two types of comp­osite decking on the market: solid and hollow. Solid looks more like wood and is heavier than the hollow version. Because of its greater mass, solid decking will expand and contract more. Hollow composite decking has a more man-made look. However, it won't expand and contract as much as solid composite decking. composite decking is more popular because of its superior strength and closer resemblance to real wood. 

So compose yourself and just...ask Dave!

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