AllergyConsumerReview

Mold Growth Removal with Dehumidifier, Steam Cleaner, and Air Sterilizer

Mold Removal and Crawl Space Q&A

QUESTION

From: Fred R.

I have a new addition to my home – about 1,900 sq.ft. of crawl space. The crawlspace is approx 44″ high from the bottom of the floor joist to the top of the stone base floor. The crawl space is well vented with foundation vents and I have 6 mill visqueen on the dirt floor covered with 4″ of crushed gravel. I also have two sump pumps.

The problem is that during construction, the floor got wet and there is some white and black mold on the floor joist and the underside of the floor sheathing. My thought is to dry out the crawl space and the mold will go away before it gets too bad. Would a dehumidifier work for this problem or do I need to force some more air circulation under the house with fans?

Thanks for your help,
Fred

ANSWER

Hi Fred,

Getting the humidity under control will help your mold problem but not eliminate it all together. The mold will remain active as long as the humidity remains high usually 60% or higher. Therefore, if you lower the humidity with a dehumidifier to 50% and maintain it there, the mold will become inactive and not get any worse. However, it will not die and disappear and it will still emit mold spores. For this reason, it would be beneficial to clean up mold growth removal. There are several ways you can do this.

US Steam White Tail US600 Vapor Steam Cleaner

I would caution you to be careful when doing mold growth removal. I recommend wearing a mask to prevent inhaling the airborne mold spores that will be present especially when you disrupt the mold. Also, you should isolate the area as much as possible so the mold spores cannot circulate to another area of the basement, where it could begin to develop in a new area.

In answering your question as to whether or not it is helpful to run fans, this is a good idea because when there is water in a liquid state, it will aid in the evaporation of the water; the increased humidity caused by the evaporation should be removed with a dehumidifier. In addition, mold likes a dark environment with no air movement, so circulating the air with fans is a great idea.

Keep in mind there are three things necessary for mold growth:

Pure & Dry HEPA Dehumidifier Air Purifier Combo

Based on the dimensions you gave me, you would need to remove approximately 38 pints of moisture per day to maintain a relative humidity of 50%. You could consider the Pure & Dry HEPA 70 Dehumidifier and Air Purifier or the Frigidaire 70 Pint Dehumidifier.

Besides a dehumidifier, another way to prevent mold from redeveloping would be to remove the mold spores that are airborne. This is normally next to impossible especially if there is mold already present in a particular area. However, assuming the mold in the area will be removed eventually this can be accomplished over a 4 week period through the use of an Airfree air sterilizer.

Airfree Onix 3000 Air Sterilizer
Read the reviews here!

The way it works is the mold spores enter the air sterilizer through convection where they go into a chamber where they are incinerated at 400 to 600 degrees. The air is then cooled and the sterilized air is emitted back into the room. Slowly over time the amount of mold spores in the air will be reduced down to zero and by leaving the unit running continuously, any new mold spores introduced into the air will be removed. The net result is if conditions arise to encourage the formation of mold like water or excessive humidity, mold will not develop because you have removed one of the three things necessary for mold to develop. In your case, you would need 2 of the Airfree air purifiers because one of these units will sterilize an area of 450 to 650  square feet with a ceiling height of 8 feet, which is 3600 to 5200 cubic feet. You have approximately 7600 cubic feet so 2 units would be recommended. The nice thing about the Airfree is it is completely quiet and there are no filters to change and zero maintenance. The electrical usage is like a light bulb so it might cost you a couple of dollars a month to run one of these.

One final note, I failed to mention to you that the most important thing to do when you have mold is to consider the source of the mold to begin with and make sure the reason for the mold occurring in the first place has been remedied. It sounds like you have already taken care of this based on the fact the mold was a result of water leaking during construction.

Our page about Mold Solutions can also provide additional information on mold removal.

Please feel free to contact me to discuss any of the products we offer from AllergyBuyersClub.com