making decisions about roof replacements

making decisions about roof replacements

Answers To Questions About Vinyl Siding And Mold

by Lorraine Fisher

Mold, mildew and algea are not common problems on vinyl siding installation. However, in some climates and under some circumstances, vinyl siding can be affected by the growth of mold or mildew. Read on to find out what you should know about this issue. 

How can you tell if there is mold, mildew or algae growing on your vinyl siding?

Mold and mildew will often be black or gray and spotty. Algae will be light green, streaky and slimy, like what you might see growing on the side of a fish tank. 

Where does mold, mildew and algae grow on vinyl siding grow?

Mold, mildew and algae all prefer to grow in shady, moist areas. It's a more common problem in moist climates and on the north side of houses. You may be able to find it growing on siding located behind shrubs, because shrubs trap humidity against the house and block the sun.

How can you get rid of the mold and algae?

Mix a solution of vinegar and water. Use the solution to spray the house, then scrub the stains with a sponge and a plastic scrub brush. If this doesn't work, turn to a solution of oxygen bleach, detergent and water. Spray the siding with the oxygen bleach solution and scrub it as you did with the vinegar and water. 

Will this discolor the siding? 

Vinyl siding is extremely durable and should not be discolored by this cleaning, but you should test it for color fastness anyway on an inconspicuous part of the house. Spray that part of the house and wait an hour to see if the color is affected. If the color isn't affected, you can use it to clean the house. 

How can you prevent mold from growing on vinyl siding again?

Get rid of any moisture in the area and encourage sunlight to shine on that part of the house. This can be done in a variety of ways:

  • Clean the gutters of your house and check the gutters for leaks.
  • Remove plants from the area that frequently grows mold.
  • Prune back any trees that prevent sunlight from reaching that part of the house. 
  • Permanently turn off sprinkler heads in that area of the lawn. 

What can you do if the mold keeps growing back?

If the mold keeps growing back, it's possible it could be growing on the opposite side of the siding and has been growing from the inside out. This could be due to a problem with your home's envelope or because of a leak. If this is the case, you should have a vinyl siding contractor look at your siding and assess the situation. 


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making decisions about roof replacements

Is the roof on your home ready for replacement? If so, do you know what type of roofing you are going to have installed to replace it? Will you have the existing roof removed, or just have the home re-roofed? You will face several decisions while you work to replace the roof on your home. Scroll through my site to find a great list that can help you decide what product and method of installation will be best for your home. Hopefully, the information provided will take some of the confusion and stress out of this big, important home improvement project.