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03-12-2008, 11:39 AM
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#1
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Pro
Trade:
Preservation & Reproduction Millwork
Join Date: Dec 2007
Posts: 3,044
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Mold on Hardie
I've got about 1000 sf of Hardie sideing for my house. The material is primed lap siding. I started putting it on the house last year untill the winter weather showed up. I covered the material and walked away for the season. When I uncovered it a few days ago it was dry but it had mold on it.
What have you guys used that is mild but kills and removes mold. My first thought was bleach/water mix but I'm worried the bleach might screw up the primer coat. I'll need to clean both sides and let it dry before I install it. Hope you can help, Thanks.
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03-12-2008, 12:53 PM
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#2
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Pro
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General Contractor
Join Date: Feb 2008
Location: Western North Carolina
Posts: 482
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I have always used bleach, but I see your concern. I think TSP is an option. Check out the labels and it shoudl tell you if it will.
__________________
Cal
You hired WHO 
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03-13-2008, 04:29 PM
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#3
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Pro
Trade:
Preservation & Reproduction Millwork
Join Date: Dec 2007
Posts: 3,044
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Thanks Cal. I'll look into that 
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03-21-2008, 10:08 PM
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#4
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Pro
Trade:
Dry Ice Blasting
Join Date: Apr 2007
Location: Ontario, Canada
Posts: 198
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Hey Jason,
I'd stay away from bleach, try a product called Concrobium - you can get it at Home Depot. It kills mold and won't damage the siding, as well you don't have to worry about the surrounding area.
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03-21-2008, 10:26 PM
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#5
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Handle It!
Trade:
Everything The Union Guys Do Not Want To Do
Join Date: Feb 2008
Location: Brooklyn, NY ~ Haverford, PA
Posts: 7,901
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I have always used a mild solution of bleach. It works best. Period. Bleach has little damaging effects on non-organic compounds.
The next best thing is Dimethyl Benzyl Ammonium Chloride.
The real question is WHY is there mold and what must be done to prevent the return.
The US Forest Service suggests:
Powdered household detergent 1/3 cup
Household liquid bleach 1 quart
Trisodium phosphate 2/3 cup
Water 3 quarts
Last edited by MALCO.New.York; 03-21-2008 at 10:33 PM.
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04-15-2008, 09:11 AM
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#6
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Pro
Trade:
Painting
Join Date: Oct 2006
Location: Florence, Alabama
Posts: 2,001
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Quote:
Originally Posted by MALCO.New.York
I have always used a mild solution of bleach. It works best. Period. Bleach has little damaging effects on non-organic compounds.
The next best thing is Dimethyl Benzyl Ammonium Chloride.
The real question is WHY is there mold and what must be done to prevent the return.
The US Forest Service suggests:
Powdered household detergent 1/3 cup
Household liquid bleach 1 quart
Trisodium phosphate 2/3 cup
Water 3 quarts
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Have you used this? If so, on what kind of surfaces? Result?
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04-15-2008, 11:33 AM
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#7
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Siding Windows Doors
Trade:
Exteriors
Join Date: Jan 2008
Location: Central Washington
Posts: 361
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We use comercial non detergent bleach 3/4 cup per gallon and a weed sprayer and spray, then let sit for a few minutes and then wipe. This will kill the mold and mildew without hurting the siding. If you have a bad stain you may want to use KLIZ primer on it.
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04-15-2008, 11:35 AM
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#8
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Siding Windows Doors
Trade:
Exteriors
Join Date: Jan 2008
Location: Central Washington
Posts: 361
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04-15-2008, 11:37 AM
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#9
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Siding Windows Doors
Trade:
Exteriors
Join Date: Jan 2008
Location: Central Washington
Posts: 361
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04-15-2008, 11:45 AM
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#10
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Siding Windows Doors
Trade:
Exteriors
Join Date: Jan 2008
Location: Central Washington
Posts: 361
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Can you imagine all the warranty jobs in about ten years when some of the cement board planks begin to have real mold issues on the back of the panels and into the walls.There is no way to avoid mold unless the entire plank is sealed so moisture and dust cant get behind the siding. When the warranty lawsuits start everyone including the manufacturer will be pointing a finger at the siding installers even if its an obvious roof leak.
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04-16-2008, 10:39 PM
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#11
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SEALERGUY
Trade:
DECK RESTORATION-BRICK PAVER RESTORATION-
Join Date: Feb 2008
Location: COMMERCE TWP. MICHIGAN
Posts: 19
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Mild bleach solution will work, scrub with soft to medium brush, rinse(it wont hurt the primer at all), Once you get the siding up, if you can afford it use sherwin williams duration latex house paint, it's around 40/gallon, but you wont be repainting anytime soon. The mold grew from sitting under that tarp for a while, wet, with just enough light for it to grow. It will not grow like that once you get it in the air where it can breath.
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04-16-2008, 10:48 PM
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#12
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Handle It!
Trade:
Everything The Union Guys Do Not Want To Do
Join Date: Feb 2008
Location: Brooklyn, NY ~ Haverford, PA
Posts: 7,901
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My experience is this: Bleach and water. NO SCRUB. Soak (20 minutes). Hose. Repeat. MAGIC!
Mold WILL proliferate if it is not COMPLETELY cured. After cleaning, Sunlight is a wonderful fixative!
Put bleach on a hard wood floor and watch stuff rise out of it!
I LOVE BLEACH. It WILL be very important in the not so distant future. WATCH!
And for those Eco-Minded persons. Bleach breaks down into a simple salt and water/hydrogen gas. IT WILL NOT DAMAGE MOTHER EARTH.
Last edited by MALCO.New.York; 04-16-2008 at 10:51 PM.
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04-17-2008, 07:11 AM
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#13
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President
Trade:
Installing windows, siding, roofing, doors, patio rooms, gutters and shutters.
Join Date: Dec 2007
Location: Central Maine
Posts: 289
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Quote:
Originally Posted by easy sider
Can you imagine all the warranty jobs in about ten years when some of the cement board planks begin to have real mold issues on the back of the panels and into the walls.There is no way to avoid mold unless the entire plank is sealed so moisture and dust cant get behind the siding. When the warranty lawsuits start everyone including the manufacturer will be pointing a finger at the siding installers even if its an obvious roof leak.
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I was on a sales call last night and the people ask me about Hardie plank or any cement board type of siding. I told them I don't like to installed any siding of the type but that we are a family business and it will provide work down the road for my son in 10 years. 
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05-25-2008, 12:20 PM
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#14
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Registered User
Trade:
Pressure Washing & Roof Cleaning
Join Date: May 2008
Posts: 12
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Use a bleach solution with a mild soap. Apply let dwell, and rinse away.
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