Category Archives: exterior painting

Exterior Paint Stains and Where They Come From

Exterior Paint Stains and Where They Come From

Where are your exterior paint stains from?

We’re pretty big restoration and historic painting nerds here at SFW Construction. An old USFS article about different mechanisms of paint discoloration was circulating our office today and we thought you might like it. We’ll give you the rundown, but check out the original article for more delicious details.

blue stain fungus dead woodMildew – Okay, you probably already know this one. Mildew is a spore based fungi that grows on often damp parts of your home. Often mistaken for dirt or silt splash from rain, you can check a suspect mildew patch by applying a bleach solution to a swatch. If the stain is mildew, you’ll see the spores lose their color after a minute or two while dirt will remain dark. What the USFS article doesn’t mention is that many modern exterior paints are anti-microbial. If you’re a few years out from your last paint job, it might be time to think about repainting.

Ghost stains –

Exterior stains are common on houses despite often being a pain to clean. While some may be from exterior sources like a rusted gutter screw, others can be indicative of water running outward from inMystery exterior paint stainsside your walls. If you see stains on your house and can’t narrow down the source, it might be one of the following:

Blue Stain – A microscopic fungus often infects the sapwood of trees harvested for structural materials. Although the blue wood staining that the long deceased cells leave behind does not hinder the structural function of the wood, (some builders even use the blue stained wood for creative furniture building, the color will run if the wood’s water content is too high. Even if your house has Hardie composite planks, your trim or other wooden materials could be the source of blue stain!

Water Soluble Wood Extracts – Cedar is one of the most common siding materials for its ability to resist wood rot. This fungal resistance is due to the tannin and other extracts that the trees’ cells produce for disease resistance and contribute to the wood’s dark color. Similar to blue stain, the tannin will run if a leak or condensation exists. Key in on light to dark brown stains.

Iron Stain – It’s industry standard to use galvanized, stainless steel, or aluminum nails where water may come into contact. Most quality siding contractors wiRust exterior paint stainll also caulk nail heads not only to create a smoother painting surface but to also seal water out. If common ferrous nails or low quality galvanized nails were used, rust may form over time if water comes into contact with them. We all know what rust looks like, light to dark orange or copper color should tip you off.

Siding stains are ugly, but it’s usually a good idea to get an idea of where your stains are coming from before washing them off. Have a weird siding stain? Shoot us an email or post the photo on our Facebook wall, we’ll have one of our painting experts check it out!

House Painting Tips from Portland Painting Pros

House Painting Tips from Portland Painting Pros

Is Painting Your House Overwhelming You? Here are 4 professional house painting tips! Painting your house can be time consuming and a bit overwhelming, especially when it comes to painting your home’s exterior.  In this article I am going to discuss some of the fine details that will make the painting process easier from the start.  In fact,… Continue Reading

Don’t Wait for July!

As the weather heats up, so do Exterior Painting and Siding Jobs for Portland Contractors April has only just begun and we’ve already seen intense hot weather.  Do you know what happens when the sun comes out and weather gets warm?  Everyone decides its time to do those exterior home repairs.  This includes exterior painting,… Continue Reading

Portland Exterior Painters

Portland Exterior Painters

Portland’s Finest Exterior Painters Offer Siding, Dry Rot Repair, and more! Sometimes Exterior Painters have to offer more than just painting.  Fortunately, exterior home painting is just one of our specialities!   The project began at 7100 SW Shady Ct. in Tigard, 97223.  The damage was extensive as you can see below.  Before we could do… Continue Reading

Portland Exterior paint

Portland Exterior Paint – Spring is just around the corner Are you ready for Spring?  SFW Painting can’t wait!  This is going to be our best season yet as we gear up with all the new colors and new styles from all of your favorite Portland exterior paint brands.  In honor of the changing seasons, we… Continue Reading

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