![]() Once when I was a kid, an old man (not a lot unlike Herbert from “ The Family Guy”) asked me to clean off his roof with a pressure washer. Fungus can easily be introduced into the woods interior and in years (versus decades) your wood deck could begin to experience signs of damage. So what happens when you inject high volumes of water in between microscopic wood fibers? Your deck boards can rot away if you use a pressure washer! Moisture enters the wood decks’ interior surfaces and furthers the decay process. Pressure washing can cause wood fungusWood fibers are themselves designed to move water from the roots, up the tree to the leaves to evaporate (the phloem and xylem, that’s HomeFixated’s Bio Lesson 101). Molds and mildews on wood decks need to be removed - that much is true - but when you use a high pressure jet of water to dislodge the debris, you also zap the wood deck fibers with the water too. It might seem like the easy road to cleaning green mold and mildew, but in fact, it’s really going to make it worse. The stronger the pressure washer (and the more focused and intense the spray tip is), the worse the damage is. Wood decks can be a big no-no for pressure washers. There’s an old saying that I just invented: “if ‘ said product’ was designed to resist water, then why would you clean ‘said product’ with high pressure blasts of the stuff”? Catchy, isn’t it? In this article we’ll cover where, when and how to use a pressure washer and provide some some less destructive but still effective alternatives. But if you’ve used your pressure washer to clean up your wood deck, asphalt shingles, soffit, vinyl siding or stucco walls, then you might be doing more harm than good. Nothing beats a high pressure blast of water to do some real deep cleaning. If you’ve ever had to use a pressure washer to clean off your stained concrete sidewalks and driveway, then you know how useful they can be. ![]()
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