Our contractor recommended and installed Timbertech composite lumber when we built a large deck three years ago. After the first few rains, we began to have severe widespread black mildew spots. Our deck is in full sun and we keep debris off faithfully. We have used three different cleaning products mixed with bleach, pressure washed, about four or five times per season. After what we have experienced and spent on various cleaning and sealing products, I would not recommend using Timbertech. It was advertised to be "specially designed to provide years of virtually maintenance-free use and enjoyment." The company stands by its warranty by offering to replace the product, however, the vast majority of our cost was in labor, installing a hot tub, and building and painting rails around the deck. The labor and materials for replacing the decking would cost ten times more than the decking itself. And it would still be the same product. We have continued to address the mildew issue with frequent cleanings and recently sealed it. So far, the best product we have found is PSC Deck Restorer, Afterclean, and Protector, a three step process that cleans and seals. It was expensive, labor intensive, but after a month, the mildew has not yet returned. We are hoping to extend the time between treatments. Does anyone
have any sucess with other cleaners/sealers on composite? We are hoping to find a less expensive product that is effective.
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