@Account Closed
Is it possible for us to push the reset button on this conversation? There is a ton of misconception and confusion out there regarding mold in the indoor environment. I'd like to take a moment to settle a few facts and give some sound advice.
By the way, I hope that anyone who has already posted does not find offense in my response. The BP community here is full of great, unusually helpful people, and I believe that every response posted so far was offered in an honest attempt to provide assistance. Unfortunately, the volume of misinformation out there affects even the best-intentioned of people, and some of the information that has been offered is not exactly correct. That said...
1. Mold is mold. I don't care what species it is, what color it is or what genetic research you do to it. There is no such thing as toxic vs nontoxic mold. It does not belong in your indoor environment, and it needs to be properly removed.
2. Mold is not mildew. Do not use this word "mildew". First off, mildew is a specific term used in horticulture to describe a certain type of mold. Secondly, every ambulance-chasing billboard-buying personal injury attorney will get a special tingle when they hear you using that word; this tingle can be described as the "I'm going to take a bunch of your money sensation".
3. Have it tested. From an indoor air quality perspective, you need to have an air quality test performed in your house as soon as anyone starts complaining about mold, or possible health concerns regarding mold. Mold "problems" are identified and quantified by looking at the indoor air in relation to the natural outside environment, and if your indoor air quality is consistent with the outside environment you can quash any lawsuit business right then and there, regardless of the physical presence of a small quantity of mold.
4. Don't use bleach. Bleach is NOT 100% EFFECTIVE in the remediation of mold spores. It is, however, 100% incompatible with many proper EPA-registered disinfectants used in mold remediation, and very effective in cleaning up visible evidence of mold while not actually removing the problem. Bleaching mold just makes it invisible, and therefore harder to properly address and remediate.
5. Follow a professional remediation protocol. Like it or not, a landlord is considered to be a professional, and therefore not capable of using the "I didn't know better" legal defense. Your IEP that conducts your air test can give you a professional protocol to follow that is both effective and (more or less) litigation-proof.
6. Protect your tenants. Mold reactions in humans are very similar to other environmental allergic reactions. If you are allergic to cats what should you do? Get away from cats! Give a great tenant an opportunity to stay elsewhere for a week while you fix the problem, give not-great tenants the opportunity to get out of the lease, etc. Avoid even the slight appearance that you are forcing the helpless tenant to stay in an environment that could be harmful to them (even if it is just in their mind).
7. Mold is a symptom of a greater problem. If you don't correct the problem which led to the mold, IT WILL COME BACK. You will want to get advice from a knowledgeable professional who can visit your property and help you identify the issues which led to mold growth. Based on your post, I'll guess that you'll find the following:
- concrete is a permeable, hygroscopic material. It doesn't matter how old it is or how many years it takes to cure, the fact is that moisture can - and does - travel through it.
- the high humidity is likely caused by a combination of factors: moisture transmission through concrete walls and slab floor, lack of air circulation due to no forced air heating, lack of dehumidifier, cyclical air temperature changes in the home.
- the condensation on the walls or windows is primarily due to inadequate insulation and dew point problems caused by cyclical air temperature changes in the home.
These problems can be solved with the installation of a proper dehumidifier, improvements to insulation and properly utilized vapor barriers, increased air circulation through the use of ceiling fans, proper furniture placement (not right up against exterior walls), etc.