There are a couple of tests you can perform to see if your deck needs waterproofing. Drop several drops of water onto the deck. If the water beads up, the deck is still protected and doesn't need to be waterproofed now.
Econodek Is Easy. Econodek vinyl deck membranes were designed to make waterproofing your deck, patio, roof deck, balcony, or any other outdoor project easy and affordable.
Under Deck Waterproofing with Ultimate Underdeck – How It Works There are tons of under deck waterproofing systems available that can help you create a functional outdoor space for your family. While many do a fine job of providing you a waterproof under deck, very few feature the durability, design, and strength of Ultimate Underdeck .
Once the deck is clean, apply a redwood stain or a waterproofing deck sealer. This seal will repel water and give your deck a longer life. To apply the sealer, simply purchase a pad with a little reservoir and simply brush it on.
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Duradek White Paper - June 2014 - - The D's of Decking Duradek White Paper - Walkable and Waterproof: Flat Roof Decks - Waterproofing Your Outdoor Living Space for 40 Years - The Canadian Business Journal, March 2014
A deck adds value to your home and provides a wonderful outdoor space to relax or entertain, but only if it’s properly maintained. This basic, if involved, maintenance should be done every 1 or 2 years and can allow you and your family to enjoy your deck for a long time.