I apply the oxygen-bleach solution and allow it to sit for 15 minutes, never allowing it to evaporate. Mix 1 cup of bleach into 1 gallon of water. Discover answers to thousands of questions. Stained it a solid color in September 2010. Q. Insecticides are most effective on the younger larvae. It appears that the leaves on the oak are being eaten. However, repeated years of defoliation can stress trees and make them more susceptible to disease and boring insects. The dark spots on your deck, based on the photo you sent me, appear to be mold and mildew. The iron oxide reacts with the tannins in the wood and stains it black. Mold and mildew grow when the wood is wet and doesn't get a chance to dry often. Never apply a wood deck stain during rain or if rain is fore casted shortly. Most deck stain brands will warn against the application of their product within 12-24 hours of rain being forecast. Rinse with clear water from a garden hose. The food could be dust, dirt, and airborne sugars from some other vegetation that's carried to your deck by the wind. In late fall, the flightless female moths climb up hardwood trees and lay their eggs. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. Now, larvae are ½ - ¾ inch in length, but mature larvae reach about 1 inch. House moisture escaped through the walls due to improper house ventilation. The composite lumber has developed dark spots all over it. The FAQ page at the Trex web site states, “While most of the raw materials used in making Trex are recycled, these materials are carefully processed to ensure the highest level of quality and performance.” However, it’s possible that mold and mildew spores could be already present in the raw recycled wood material that’s used to make the decking. In the photo you can see where a bolt, a bracket and even a nail have been left on the deck and they have left a faint stain behind. Splotchy Appearance. All rights reserved (About Us). It seems more to show up when the grass is dry but we had some rain and the grass is coming back and still see some residue on the mower after I mowed last night. Learn the common causes of concrete drying different colors or with spots and what countermeasures to take to fix the problem By George Seegebrecht Updated August 26, 2020. Deck Stain Secret#1: Sanding is Key for Longest Deck Finish Life Sanding is the single most important thing you can do to prep wood for a good deck stain or deck refinishing job. A. You’re not the first consumer to write to me about this issue with composite decking, and I’m sure you won’t be the last. After the wait period, use a stiff scrub brush to clean the decking. Whether you’ve gone for cheap decking or something sturdier and longer-lasting, blackening is a risk, especially after a long, wet winter. This is likely fall cankerworm (Alsophila pometaria). These little tarry black dots on siding and fencing are the spores of mulch-borne artillery fungus. Mold and mildew feed on natural materials such as wood fiber, natural sugars, dirt, dust, grease, oils and food. I have these black poppy seed sized stuff falling by the thousands and thousands all over my deck from an overhanging oak tree. Combating tannin starts with a weathering process. A visit to the Trex website reveals they have a comprehensive cleaning guide that may help you. This morning, 20 hours after the second application, the deck is still tacky to touch. We put down Trex decking in 2008. Those black spots are mold and mildew. I’ve visited a manufacturing plant where composite decking is made and have seen how the wood fibers and plastic are kept separate until just before they enter the extruding machine. Lois Stewart was aghast when little, black tar-like spots started mysteriously appearing all over the new white vinyl deck railing and white aluminum siding at her Upper Allen Twp. DECKS: SHINY AREAS My deck has shiny areas after applying three coats of … It started with a few spots and has multiplied over the two-year period. They vary in color from light green to dark brownish green. 1) The new grill and deck furniture that was assembled on the deck surface, metal filing from assembly process and/or manufacturer. Subscribe to SILive.com. Overnight dew that covers everything outdoors many days out of the year is perhaps the biggest source of the problem. The spots will disappear in a few days. I have these black poppy seed sized stuff falling by the thousands and thousands all over my deck from an overhanging oak tree. When fungus meets wet wood, the tannin in the timber reacts and forms a horrible black stain. I have an all plastic deck, made by Tandeck, I used bleach and a power washer every spring. Due to weather conditions, stains may not be completely dry for a few days. Right after it was built the wood started turning all spotty black. When it comes in contact with any metal, a black stain will form. Subscribe to get FREE alerts each time a new video or column is uploaded to AsktheBuilder.com. Iron oxide stains in wood are usually dark spots caused by prolonged exposure to water and / or metal. The condition you describe can be the result of pre-existing moisture content or from rain or morning dew on the surface after application of product and prior to the Deck Boss™ completely drying. Thanks. However, if it rains on the deck before the Deck Boss™ can dry the problem will continue and it may be necessary to roll on another coat or 2 of Deck Boss™ after the deck dries to blend in where the water spots were. An oxygen bleach works best when allowed to sit for 20-40 minutes. 03-12-2012, 08:01 AM veryangry : 414 posts, read 719,713 times Reputation: 285. Watering these trees during the dry summer months can help them cope with the stress of defoliation. Most defoliated trees regrow leaves by the end of June. Bleach is one of the best solutions for removing black mold and mildew spots on your wooden decking. For large trees there is not much that can be done in the spring to protect against the insect since there is often no practical way to reach the canopy with a spray. This spotting can happen on any deck. The oxygen ions in the solution readily clean mold, mildew, algae and any food you may have spilled on the deck. High population cycles typically do not last for more than three years in a row as natural predators and diseases typically keep this native insect in check. Add to this the possibility that the wood fibers in the decking may not have any preservative added to them at the factory. My own composite decking has spotting issues, algae growth and uneven coloration issues. Although the manufacture makes every effort to mix the ingredients evenly, I can see how it’s possible that this doesn’t always happen. All turfgrasses are susceptible to disease and insect damage, although some problems affect certain types of grass more frequently. MOLD AND MILDEW The dark spots on your deck, based on the photo you sent me, appear to be mold and mildew. My Hubby and I went out on our deck (wood if that matters) sat on our deck furniture (metal - no fabric) to eat dinner. Scrape away blistered paint, and sand to bare wood. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). Even after that, it needs to remain undisturbed for several days before you put outdoor furniture back on the deck. The sugars can float through the air from trees near the deck. Shiny black paint... milky portions after rain Ok, so i acquired a black stain will.. With any metal, a respray oak which is about 100 feet tall or. Car... it 's eating food that lands on your Trex Accents decking life... Horrible black stain will form more, never allowing it to sit for 20-40.... Cankerworm were high in many parts of Southern Maryland of rain being forecast, made Tandeck! The oxygen-bleach solution and allow it to evaporate are being eaten may help you the larvae feeding. Up onto the decking surface black spots on deck after rain was no rain forecast, only )... 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