Although composites are not as high maintenance as the typical wooden decking, cleaning these decks requires a lot of harmful chemicals and would actually strip off the composite finish to get rid of mold. Not a very environmentally friendly way especially if it gets into your garden, is it? In some cases, physical scrubbing may even be needed to remove that stubborn black mold sitting in the middle of your deck.
Furthermore, these materials are always subject to mechanical wear and tear and the usual fading in design. While conventional wood decks can be refurbished every 5 years, your deck cannot be refurbished and has to be replaced. Plus, the limited lifetime warranty of most decking companies do not cover common damage such as mechanical tear, mold growth and fading, and even if you have a legitimate claim, sometimes, labor and disposal is not covered as well. Make sure you check the warranty thoroughly before you decide to purchase composite decks for your home.