Composite decking has a high rate of expansion and contraction due to temperature swings. It actually moves greater distances and more unexpectedly than traditional wood. When the boards expand and contract, they may split, delaminate, and peel. The movement can cause your decking to shrink, warp, twist, and bend. The 4 Major Disadvantages of Wood Composite Decking - Owens Corning owenscorning.com https://www.owenscorning.com � en-us � lumber � blog owenscorning.com https://www.owenscorning.com � en-us � lumber � blog Composite decking has a high rate of expansion and contraction due to temperature swings. It actually moves greater distances and more unexpectedly than traditional wood. When the boards expand and contract, they may split, delaminate, and peel. The movement can cause your decking to shrink, warp, twist, and bend.