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Old 10-19-2014, 07:19 PM   #1
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Mold/mildewcide for crawl space

Before I encapsulate a crawl space, I want to kill off any mold/mildew on the joists and subfloor and anywhere else down there. I want to use something that will kill that stuff, but not me. Anybody have a favorite product for that purpose?

A bleach/water mix is not what I want to use.
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Old 10-19-2014, 07:28 PM   #2
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A borate product (boric acid) will kill mold and mildew. Just spray it on. Bora-Care is available at home depot.
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Old 10-19-2014, 08:22 PM   #3
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I haven't tried it, but I've read that peroxide will kill mold.
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Old 10-19-2014, 08:26 PM   #4
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You are correct, bleach & water is not what to use.

This is: http://www.concrobium.com/products/c...-mold-control/

I have used it extensively.

Source: this is what I do.
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Old 10-19-2014, 08:39 PM   #5
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Originally Posted by ramses35 View Post
A borate product (boric acid) will kill mold and mildew. Just spray it on. Bora-Care is available at home depot.
+1 on the borates. Alternately you could spray on Zinsser BIN as long as you ventilate the space well as the EtOH content is around 50% and WILL get you drunk as he'll in short order in a confined space. DAMHIK.
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Old Yesterday, 07:42 AM   #6
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I am not at work to check on such products, we have food service rated fungicides and they sure are good at killing the black stuff. I'd have to recheck the WHMIS sheets, I am pretty sure they have a residual effect so will keep on killing.

Trade name Percept by Diversey, an Hydrogen Peroxide solution:

http://www.norfil.ca/product_oxivir-...4_en_2_56.html

But I did Google the Concrobium MSDS. Trisodium Phosphate:

http://www.concrobium.com/wp-content...DS-US-2013.pdf
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Old Yesterday, 10:22 AM   #7
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Thanks, keep em coming.

Bora-Care doesn't show at my local Home Depot. They don't all carry the same products; seems it's regional. I've looked for some other things that people have gotten at their local stores that my local store doesn't carry.

Peroxide is an oxygen bleach. Very effective. The problem is that it's hard to get it in the necessary strength.

Concrobium is available at Lowes. Have to check it out.

Anybody used Sporicidin?

I'd like to find something that I can get locally because shipping gallons of liquid is expensive.
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Old Yesterday, 11:45 AM   #8
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just out of curiosity, what's wrong with a bleach solution?
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Old Yesterday, 12:58 PM   #9
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Is there something you could fog into the space? Per my other thread I have to excavate to get better access to my crawlspace. I would love something I could blow or fog in rather than something I have to belly crawl to the spot to squirt into place.
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Old Yesterday, 03:41 PM   #10
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Originally Posted by Bicyclist View Post
Peroxide is an oxygen bleach. Very effective. The problem is that it's hard to get it in the necessary strength.
Commercial cleaning supply stores? They should have that or something similar. Pretty strong them Peroxides, we use "Viper by Diversey" at work at full strenght will kill your skin cells. 1 TBSP per Quart is the dilution ratio as a sanitizer.

If you want to make "oxygen bleach"....that's Sodium Percarbonate. Comes in a powder form again from our cleaning supply place but I don't know how good it is as a fungicide.
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Old Yesterday, 05:09 PM   #11
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1st you need to figure out why there is mold there, It will come back no matter what unless you fix the problem, likley ventaltion, either not enough, or a bathroom venting into the attic, the attic should be outside air and enough flowing thru to carry any indoor air that escapes into it out.

You need to actually remove the mold not just kill it, the spores will grow more eventualy, borax is a good way to do this. soda blasting is another and you can leave the baking soda right on the floor, it is harmless
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Old Yesterday, 06:18 PM   #12
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just out of curiosity, what's wrong with a bleach solution?
Too nasty, dangerous, corrosive. Not something you want to spray in a confined space.

Quote:
Originally Posted by mattlikesbikes
I would love something I could blow or fog in rather than something I have to belly crawl to the spot to squirt into place.
Check out ozmoses suggestion: http://www.concrobium.com/products/c...-mold-control/ Poke around there and you'll find some info on fogging.

Quote:
Originally Posted by Roland3
1st you need to figure out why there is mold there
That's easy; crawl space.
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Old Yesterday, 11:02 PM   #13
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Originally Posted by Bicyclist View Post
Quote:
Originally Posted by Roland3
1st you need to figure out why there is mold there


That's easy; crawl space.
Nope, moisture is why there's mold, getting dry air in there will help.

In a relatively dry climate you can simply cut a few 6 inch square holes in exterior walls, cover with wire mesh to keep out bugs and rats.

If you live in a humid or semi-humid location, you don't want to bring in the outside air. You can instead put a fan that blows the air out of the space and open a small vent to the interior of your house. That gets the relatively dry air from the house going into the crawl space and the moisture going out.

Here's some epa info: http://www.epa.gov/indoorairplus/tec...sture/1_4.html
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Old Today, 10:18 AM   #14
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just out of curiosity, what's wrong with a bleach solution?
Bleach doesn't kill mold mycelia or spores - just makes them go white.
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Old Today, 02:16 PM   #15
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Nope, moisture is why there's mold, getting dry air in there will help.

In a relatively dry climate you can simply cut a few 6 inch square holes in exterior walls, cover with wire mesh to keep out bugs and rats.

If you live in a humid or semi-humid location, you don't want to bring in the outside air. You can instead put a fan that blows the air out of the space and open a small vent to the interior of your house. That gets the relatively dry air from the house going into the crawl space and the moisture going out.

Here's some epa info: http://www.epa.gov/indoorairplus/tec...sture/1_4.html
in the north east where winters are cold you do not want any sort of indoor air going into your attic, it creats moisture. not sure about the climate in Maryland maybe its different bulding techniques down there. our attics are completyly outside air, the air flows from the soffit vents or gable end vents up thru the roof vents, ridge or box type. that carries away any moisture or heat that escapes thru the living space up to the attic. I recently found my house had the bathroom fan vented right to the attic and it caused all sorts of moisture problems. an outdoor mold formed on my roof decking and started delaminating it. the key to a healthy attic is good air flow,(outside air), yes cut holes in tight spots to allow better flow, unblock soffit vents that are blocked, use rafter shoots or baffles to keep insulation from blocking soffit vent flow up thru the attic
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