Mold On Hardie

Jason Whipple

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.

__________________
Jason E Whipple, General Manager
Historic House Restoration, Cincinnati, Ohio
Facebook | Twitter

jcalvin

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

Jason Whipple

Thanks Cal. I'll look into that

__________________
Jason E Whipple, General Manager
Historic House Restoration, Cincinnati, Ohio
Facebook | Twitter

CO2Solutions

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.

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

__________________
Something to One may be Nothing to another!

Ultimate Wisdom---------
http://www.youtube.com/watch?v=OW-cnizLDEE

boman47k

Have you used this? If so, on what kind of surfaces? Result?

easy sider

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.

easy sider

easy sider

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.

sealerguy

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.

__________________

DECK-TECHS-MICHIGAN-DECK RESTORATION-BRICK PAVER RESTORATION-

MALCO.New.York

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.

__________________
Something to One may be Nothing to another!

Ultimate Wisdom---------
http://www.youtube.com/watch?v=OW-cnizLDEE

Jake Stevens

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.

ccpc

Use a bleach solution with a mild soap. Apply let dwell, and rinse away.

__________________
Lance Powell
Clay County Pressure Cleaning, Inc
Pressure Washing Florida
Roof Cleaning Jacksonville