In addition , over time, Redwood will trun a grayish color because of Tannic Acid. Please, we need ideas on what to do. The deck is on the sunny side of the house. The black coloring or darkening of the cedar siding is caused by mold growth. Failure to remove mold from unprotected softwood decking is a surefire way of creating decay and rot issues. I built this 100-foot long verandah in the mid-1990s, but after years of keeping it looking good using Sikkens DEK, … ... black spots on red cedar. These black marks shouldn't have appeared so fast, should they? Right after it was built the wood started turning all spotty black. The discoloration is caused by a chemical reaction between extractives in the wood and iron in steel products, such as… One is a small 6x11 deck, the other a 14x21. My own experiences with wood decking prompted me to replace the cedar deck boards on the wrap-around verandah of my own house with composite lumber. Use the directions found on the product's container. I outlined the steps below: Spray your deck with a hose, removing any minor dirt. If you think about it you'll remember the source. When properly maintained, cedar siding can last for decades. Wood is an excellent building material for the outdoors. Stained cedar siding has a tendency to discolor over time. If your beautiful, unfinished cedar or other natural wood deck is looking more weathered than you would like or has moss, lichen, or other dirt on it, there's a quick and easy way to clean it without wasting money on harsh chemicals. By ibrox in forum Painting Replies: 1 Last Post: 17th Jan 2011, 07:41 PM. Thankfully, cleaning usually removes mildew and mold stains. Hi. It looks awful! Cedar, along with any other wood, is a natural habitat for mildew and mold. If you are still having trouble removing the shiny spots, meaning the stain is too thick, you may have to use a stain stripper. As I have already iterated, if mold is apparent below your deck, you can add ventilation or re-grade your landscaping. After one year it's covered with mildew and has lost its original beauty. One method that is usually successful is to use a wood cleaning product. There are many products on the market that will take off the stain. Also known as artillery or cannonball fungus (Sphaerobolus), it uses internal water pressure to forcefully fire its spores (similar to seeds) up to 20 feet away.The fungus sets its sights on bright areas so that means it will aim for any pale surface that reflects light, such as the siding on your house. Good maintenance practices for cedar decks include allowing proper water drainage; keeping the surface free of dirt, leaves, pine-needles and other debris; and moving planters, benches and other deck accessories from time to time to permit the deck beneath them to dry thoroughly. Looks like small pools of coffee got spilled on it. Mildew is easily dealt with by using a pressure sprayer and applying a … Water stains are one of the hardest to remove from cedar wood. Now the cleaned and brightened cedar wood siding is ready to stain. It's black. The surfaces of finished Western Red Cedar decks, siding and trim boards exposed outdoors inevitably become dirty and may also be discolored by mildew, algae and moss. By Sandy Feather – Penn State Extension. Softwood decking species such as pineand cedar must be treated, stained or painted on a regular basis to keep mold from causing problems. It doesn't look like the mold that has been described. We decided to apply an oil-based natural cedar color sealer to our new cedar deck to preserve the beautiful color of the cedar wood. Whether it is used for house siding, outdoor furniture, decks, fences, or sheds, wood holds up well against weathering, as long as it is maintained.But whenever water and wood mix, there is the possibility of water stains. If the deck is in a protected area that gets little sun, a fungus is the more likely culprit. However, when tannins mix with metal and iron, a chemical reaction occurs and a black stain can form. Mold & Mildew or other fungus growth, such as common green lichen or moss (often confused with algae), and the stains that result are considered an “Act Of Nature” because fungi can only occur in environments where spores exist, they land on a surface and receive moisture, such as in the outdoors, where composites generally are located. A deck that dries after wetting will last longer than one that stays damp. The next step is to go after black marks that are caused by tannin stains, mold or mildew. Cedar deck problems - Black Spots I had a cedar deck built last year and have had nothing but problems. To remove mold, mildew, and grime from wood decking, you only need a few ingredients, the right tools, and some elbow grease. The iron oxide reacts with the tannins in the wood and stains it black. Once the problem areas are cleaned or sanded off, allow the deck to dry before reapplying a light coat of TWP. If you own a deck -- especially one in a shady or wet location -- you have to accept that mold is part of the ecosystem. The customer wanted something different, 'rustic' looking, so I ordered mid-grade lumber (not heartwood) and let the deck weather a month or so before sealing with a clear acrylic polymer. As written by the Western Red Cedar Lumber Association. How to Clean Stained Cedar Siding. It looked sort … Removing Black Stains in Wood Furniture With Oxalic Acid: Iron oxide stains in wood are usually dark spots caused by prolonged exposure to water and / or metal. Surface dirt should be removed from cedar shake siding before attempting to remove black spots from the mold. There typically are a few reasons why this occurs. For mold on the deck, you need to throw in some elbow grease. Staining Cedar With a Semi-Transparent Stain . I'm kinda new to decking and looking for opinions on a new red cedar deck I laid two months ago. My problem is that my small deck already looks horrible! 1. Tannin reacts with a number of things, such as steel in tools or nails, to create discoloration. Many species of wood contain tannins, including cedar and redwood. Black spots on newly oiled Jarrah verandah. These are the most common causes of black stains you'll find on redwood and cedar fence/decks. FinishLine Iron stain, an unsightly blue–black or gray discoloration, can occur on nearly all woods. Tannic Acid is contained the lumber. Cedar is beautiful, durable, and naturally resists decay. The spots are about the size of the head of a pin and appear to be black or dark brown in color. Oak, redwood, cypress, and cedar are particularly prone to iron stain because these woods contain large amounts of tannin-like extractives. Black Spots We see this all the time, It's caused from steel filings coming in contact with the wet cedar, metal filings from the balusters, steel wool, and some shingles contain iron granules too. What is this? The few solid particles in this mix will not significantly obscure cedar's wood grain. After the hose went on the deck, it got black spots all over it. The black stains on Redwood are caused by the very thing that makes Redwood resistant to bugs. A common problem that homeowners have with cedar siding, however, is extractive bleeding or tannin staining. DECKS: MILDEW Two years ago I had a cedar deck built. First, spot-check the stain. There are several reasons why black mold can grow. Q. I am getting small dark spots on windows and the white siding of my house. It will grow whether you use redwood, cedar or pressure-treated decking, and whether or not you paint the wood. “Those two things - cleaner and brightener - really worked well for us. Clean Your Deck Regularly. 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