What Can Cause Exterior Paint Stains?

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Not all home exteriors have paint, but many do. Wood siding and window frames, for example, are almost always painted. Even if the outside of your house is primarily covered with vinyl materials, you might have paint on decorative concrete accents or wooden gingerbread features if your residence is historic. Over time, paint can develop stains and, as a homeowner, you might not always know where they came from.

This can be frustrating, especially if the same stains keep appearing over and over again. In this guide, you will learn what can cause some common types of exterior paint stains. Depending on what sorts of stains your Carolina home seems prone to, this may help you avoid the problem repeatedly. 

Mildew stains – Mildew, a type of fungi, frequently grows on wood. It may look like dirt to the naked eye. To double-check if a particular stain is dirt or mildew, apply some bleach to the patch. Mildew spores will temporarily lose their color, while dirt will remain brown or black. Nowadays, many exterior paint brands are producing anti-mildew options, so if it’s been a while since your house was painted, a fresh coat of paint is likely to fix your mildew problem for good. 

Blue stains – Blue stains on wood are caused by dead fungus cells from a specific sort of microscopic fungal species. Typically, the best solution for blue stains is to apply a fresh coat of anti-microbial paint. If you choose to replace the wood with another material, such as vinyl or fiber cement, blue-stained wood is 100% salvageable. Some people make very cool salvaged furniture using wood that has blue patches. 

Iron stains – Today, most reputable contractors use galvanized nails to attach wood siding boards and wooden architectural features. There are some cases, though, such as DIY projects and projects that were done decades ago, in which non-galvanized nails might have been used. When non-galvanized metal surfaces come into contact with wood, they can leave rust stains over time. Because rust is iron-based, the stains will be coppery in color. To make sure these stains don’t re-occur, it is wise to rip out the old nails and install modern, galvanized ones instead. 

How can I prevent wood stains?

The best way to eliminate exterior wood stains is, of course, to replace the wood elements on your Carolina house with vinyl or another material. If you want to keep the wood for historical accuracy or budgetary reasons, your best option is to use anti-microbial paint to keep potential stains at bay. If you have questions about the best brands of paint to use on the outside of your home, spend time doing research online or talking to the contractor you plan to use. 

If you are interested in replacing the wooden siding on your home, contact the Hatch Homes team. We can install a variety of siding products, so no matter what you’re interested in for your house, we can help you achieve the look you want. Our crew offers no-charge consultations, so don’t hesitate to call at your earliest convenience. 

More than just a contractor.

Hatch is your partner for exterior remodeling.