Why is My Siding Turning Green?

Have you walked around your house recently only to notice that your siding has a greenish tint to it? When your siding becomes green like this, it’s a sign that there’s a problem and you need to take action!

green siding | siding repair | long island

What Is It?

Yes, the weed wacker and lawn mower can leave green stains on your siding, but only in select areas. When the majority of your siding begins to turn a greenish color, know that it’s most likely due to mold, algae, or a type of moss. For the longevity of your siding, grab some equipment and start the cleaning process.

What You’ll Need

The ingredients that make up this solution will work on most types of siding like vinyl, HardiePlank, etc. Test each chemical solution to see which one will remove the green color completely. Larger mold problems will need stronger solutions to clean it.

  • Equipment: Duct tape, Plastic sheets, Garden hose, Buckets, Long-handled scrub brush
  • Chemicals: Trisodium Phosphate, Chlorine bleach, or Oxygen bleach
  • Lots of water!

Cleaning Process

  1. Cover any electrical outlets, windows, doors, and plants with the plastic sheets to prevent damage.
  2. Mix together a half pound of Trisodium Phosphate with two gallons of warm water. Rinse off your house and then apply some of this solution to a small area of the siding. If the green washes away, use this solution.
  3. If the green does not wash away, then you will need a stronger solution. You can either mix one part chlorine bleach with four parts water, or use six ounces of oxygen bleach with every gallon of water. Oxygen bleach is the safer alternative for your siding and surrounding vegetation.
  4. Dip your long brush into your chosen solution and begin scrubbing side to side. Work in sections of about 20 feet at a time and rinse with the completion of each section. Start at the top of your home and work your way downwards. Don’t be afraid to apply some serious elbow grease!

Siding that’s turning green is a sure sign that something is growing on it and you need to clean it ASAP! When your siding is beyond cleaning and needs repair or replacement, contact the expert installers at Preferred Exterior. To learn more, or to schedule a free estimate, give us a call at (516) 354-7252.

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