How-To Videos

Preventing Mold and Mildew on the Outside of a House

By: Danny Lipford
Spraying mold and mildew remover on the outside of a green house.

Spraying Wet & Forget mold and mildew remover on a house.

If you live in a warm, humid climate, mold and mildew will often form on the exterior siding and trim of your home. It’s important to clean the outside of your house regularly to remove any mold or mildew and to clean it thoroughly before painting.

Make sure the paint you use on the outside of your home contains a mildewcide. If it doesn’t, have a mildewcide additive added to the paint at the home center or paint store.

If the mold and mildew return, apply an outdoor mold remover, like Wet & Forget, to your siding and trim to keep the outside of your house mold and mildew free for up to one year.

Watch this video to find out more.

Further Information

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Danny Lipford: When a house has just been painted, people want to keep that new finished look, so they often ask how to keep the mold and mildew away. It really starts before you paint.

The mold and mildew have to be cleared away before new paint is applied. Then the paint itself should contain a mildewcide. Many brands make it part of their formula, or it can be mixed in as an additive at the paint counter.

Even with these precautions, the mold and mildew will eventually return. At the first sign of new growth, apply a mold remover, like the one from Wet & Forget. It’s non-caustic, non-acidic, and contains no bleach, so it won’t damage your new paint.

You simply apply it to a dry surface and let it go to work. No scrubbing, rinsing, or pressure washing necessary. It works with the rain and the wind to gently remove mold, mildew, and algae over time.

And while the cleaning is gentle, it’s also thorough, so it lasts up to a year or more. Then simply reapply it to keep your house looking like you just painted it.



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3 Comments on “Preventing Mold and Mildew on the Outside of a House”

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  • Hugh Kelly Says:
    November 27th, 2016 at 3:54 pm

    To the homeowner with the water and mold problems.

    You need to find an honest contractor to diagnose your problems. What you wrote just does not fit any facts I have ever heard of. By water “zipping” I assume there is water on the surface of the slab. This water is flowing from somewhere and no amount of waterproofing of walls will stop it. Make sure the ground outside is well below the level of the floor inside the house, then make sure that water does not accumulate around the house when it rains. Besides the obvious question of drainage, thare too many undefined factors to consider before anyone could give you reliable advice.

    Did this house actually flood in one of Houston’s recent flooding events? If so, the flooded sheetrock and insulation will have to go, and new sheetrock and insulation nstalled.



  • Patricia Umana Says:
    June 12th, 2016 at 6:54 pm

    Hello. I will like to know if you can help us. My son purchased a home in Houston and we are having a pretty bad time since everthing is falling apart. One of the biggest issue is that water is zipping in the concrete floor slab. I fixed the brick outside from top to bottom and water stopped for a little while…then again we found the slab wet.
    In one of the bedrooms i cleaned the entire slab by had, removed the paint and dirt…applied the sealer for concrete but the problem still there and most of all white powder and the smell.
    We also have some mold on the vents of the air conditioning and those need to be changed. I have a quote for 1500 and that is pretty high for our current income which is very very tight.
    Where do i find out how to remove and change the ducts of the air conditioning on the attic. .. a step by step will help since we are planing to do that.
    Second any thoughts in the water issue…how do we stopped.
    The house has brick all around and there are the “holes” for water getting out but I suspect that is the problem.
    We need to remove the sheetrock and change the insulation…
    any ideas in how to waterproof the interior of the walls before putting the new insulation and sheetrock.
    We live in Houston where is very humid and hot plus rains a lot…plus we do not have air conditioning due to the mold on the ducts…
    Please help me and my son to figure out how to conquer the house. We are originally from Sacramento and we do not have too much experience dealing with Houston’s weather.
    Thank you so much.
    I appreciate you and your work.
    Trishia



  • Patty (Wheat) Vanderpool Says:
    April 25th, 2015 at 2:08 pm

    Danny, et. al:

    How would I remove a streak of mold from stucco ?

    Thanks!

    Great info on site and radio –


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