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Keeping Mold from Growing on House Siding?

April 20, 2009

Mold from Growing on House SidingEvery year we have to power wash the siding on the north side of our home. We get a green/black mold that comes back every year. Is there anything that will stop this? The problem isn't getting it off the house, the problem is that it comes back every year.

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By Kath from CT

Answers

April 20, 20090 found this helpful

Hi Kath,

I searched the EPA website and couldn't find anything that specifically talked about mold on siding, but they do have a page where you can ask questions. Might be worth a try:

iaq.custhelp.com/.../ask.php?p_sid=lDPAFQvj&p_accessibility...

Good luck!

 

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April 20, 20091 found this helpful

You can buy this at Home Depot, you won't be disapointed! You put it in a garden sprayer & spray it on once a year... then each time it rains, it binds with the rain to work. It's not harsh or bad for the enviorment. It's $40 for enought to cover 1000 feet. You dilute it 5 to 1.

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Product info:
http://www.sprayandforget.com

Here's what they say:
Our revolutionary patent-pending, "No Rinse" concentrated cleaner that removes green and black algae, mildew, fungus, and lichen stains from roofs, siding, decks, brick, stucco, and other exterior surfaces. Spray & Forget is an eco-friendly, biodegradable, non-corrosive product that does not require damaging power washing and/or brushing techniques. In fact, no rinsing is required and your landscaping will not be compromised. Also an excellent preventative.

 

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April 20, 20090 found this helpful

I had this problem. I sprayed it with bleach in a spray bottle every week till it stopped coming back,good luck.

 
April 25, 20090 found this helpful

Drive around and you'll notice that happens with most buildings' north sides. Especially those that don't seem to have several hundred feet between them and the next building or fence. I've heard that out in the forest, that's how you can tell which way is north - by the fungus that grows on the north side of the trees.

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I'm glad to hear about the No-Rinse. I'm going to check it out for our garage.

 
April 25, 20090 found this helpful

The north side of any structure whether out in the forest or at home gets the mold, mildew and moss. The north side of anything gets the least amount of sunlight. I don't think you can prevent this as it's the sun that kills and prevents it from growing in the first place. Noella is right, that mold and mildew tells you where north is.

 
April 16, 20170 found this helpful

Use amonia and water

 
July 13, 20170 found this helpful

Using a anti fungal soap when cleaning the house will help with the mold growing back each year the problem with most anti fungal soaps is that they are harmful to plants so I need to be really careful when using the soap now the mold will still grow back but is will decrease the speed of the growth of the mold

 
May 13, 20180 found this helpful

Unless, of course, you happen to be one of the great unknown who live in the southern hemisphere. Only a US resident could have posted the above. But then I suppose we should be grateful if he knows the next state to his own, let alone the next country.

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As to the question. There is no half-way safe cure for this (I'm assuming radiation and organophosphates can be ruled out?). At best you can hope to slow it down. Unfortunately whatever you try is also likely to cause surface damage. Go environmentally friendly and accept mould and algae as sympathetic to the location- or hi-tech. Stainless steel or pure glass are almost fool proof. Otherwise regular doses of bleach based stuff - just try not to poison yourself as much as you are assuredly poisoning everything else.

 
June 2, 20180 found this helpful

Is it "Wet and Forget"? I saw this on Home Depot's website and didn't know if this is what you meant, or if this is a different product altogether?

 
Anonymous
June 28, 20180 found this helpful

Get out there and figure it out, start with the method of rapping the house to tight to save money on heat because the walls as re so sealed that there's no ware for the moisture to go . If the modern builder would look into this and not be so stuck on what money a homeowner would save on heating bills and think about one health for years to come, I think everyone would be a lot healthier and the houses wouldn't look so discussing.

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John

 
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2 More Questions

Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.

March 7, 2006

My house has some green and black mildew on the brick and siding. The house does not need painting. I am thinking of having it power washed to remove the mildew. What time of year should it be done? I live in the Southeast.



Iris from Columbia SC

Answers

By (Guest Post)
March 8, 20060 found this helpful

Hello,
we have white vinyl siding on our house and we get the green mold on ours too. what we do is every spring we spray it down with clorox. My hubby uses a sprayer that you pump by hand...I think it is also used for spraying plants and trees. anyway it works great. no need to rinse or scrub or anything. We were going to get ours powerwashed , but then we heard that is could put holes in the siding if the person doing it didn't do it just right, so we just spray it every year now with the clorox. hth.

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brenda-ohio

 
By Carol (Guest Post)
March 9, 20060 found this helpful

I, personally, dont think power washing is all its cracked up to be... It forces water under the siding of your house or deck. (Dont forget water and wood dont mix...) The water goes in all the little invisible cracks. Also, for mold or mildew you need to use chlorine bleach... let it set and then rinse... Are you sure the green isnt moss? I have moss growing on my roof.. Moss and mildew can come together.. imho because each thrives in a wet or damp environment.. BTW, look into removing any trees, bushes, or plants that cover your house and prevent the sun from shining on the places where the mildew is growning... Best of luck...

 

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July 19, 20080 found this helpful

I lived in Louisiana for about 20 years. I had my house pressure washed every year or two. It thoroughly took off any mold or dirt. The house was brick with exposed wood & trim & soffits. Any areas that didn't get direct sun, often got a little mold. The pressure washing also extended the life of the paint. I researched paint & bought the Valspar product made for the South with a mildew inhibitor in it. My paint lasted for about 16 years before it showed signs of needing to be redone in a year or two. The washer also did the carport floor & driveway. The brick house looked great after the washing & was worth the $70.00-$100.00 that it cost (last time I had it done in LA was pre-Katrina).

 
By Guest (Guest Post)
August 20, 20080 found this helpful

I have used successfully a product called "INSTAGONE".
Spray on and watch stains disappear and wash off. It worked for me.

 
Anonymous
May 12, 20160 found this helpful

yes, I am very concerned about water getting under the vinyl siding between the wood and siding. BAD! I have mold (not moss, I don't think) Peak of house is VERY high (built on a hill) Agree we power washing. Sure would be labor intensive to climb up a ladder and do by hand. but maybe only way.

 
Anonymous
September 28, 20170 found this helpful

Did you dilute the clorox w water? Does it get all over uyour clothing when spraying?

 
Anonymous
December 23, 20180 found this helpful

We also have white vinyl siding. I bought that spray it and forget it stuff but all it did was remove the green mold / not the black. We now use a 50/50 mix of water and bleech mixed in a hand pump sprayer. It works fast and we do it as needed. Get yourself full wrap-a-round eye protection to keep the mist out of your eyes. I didn't do that the first time and suffered for a day.

 
March 13, 20190 found this helpful

I run a power washing company in cape may, nj. People shouldn't fear that the washing will get under the siding and do damage. Pro's understand how siding is installed and wash it accordingly. Some homes are just too tall to apply mildew/mold spray safely. Find a reliable company and you wont have any problems.

 
August 21, 20220 found this helpful

Don't use power wash on wood siding and it striped out cervases it looked so bad we had to put vinlyl siding on .

 
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September 5, 2014

Can I use sugarsoap on outside walls to clean green mildew off the house wall?

By Julie from New Zealand

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