The Indoor Mold Is An Early Warning Device

The mold (or mould, in the Queen’s English) has been the victim of a bad press. Mention the word and it conjures up an image of something rotting or in the process of decomposition. And yet, were it not for the mold that inspired the discovery of penicillin millions of lives would have been lost. If you love mushrooms and like your beer, you can thank the mold for that, too. The mold is a network of fungi but there are many different kinds: some good, some bad. One of the more undesirable types is the indoor mold. You usually find them in dank, dark sections like the attic or basement, or in the kitchen and bathroom. The mold is also likely to raise its unsightly presence in parts of the home that have been flooded or have poor ventilation.

The indoor mold can cause health problems, especially with those suffering from asthma. A greenish-black, slimy variety known as Stachybotrys chartarum has earned the name “toxic mold” and grows wet organic material rich in cellulose such as wood or paper (but not on concrete or tile). It can cause severe problems for humans as well as pets, and is one of the causes of “sick building syndrome”. This indoor mold can produce allergic reactions like watery eyes, headaches, frequent sneezing and coughing.

The upside is that an indoor mold can serve as an early warning device. It tells you that an area of the home is not properly ventilated, has excess moisture and that the air quality is inferior. You can then take steps to reduce moisture in the area and remove materials that cause mold growth.

The mold is everywhere and can survive under all sorts of conditions, even in places like the refrigerator. Some molds are resistant to anti-fungal soap or highly-acidic solvents. Therefore, when cleaning up a mold-infested area, you should always wear proper protection like a respirator mask, rubber gloves and the right clothing.

The key to cleaning up an area with indoor mold is to solve the moisture problem. Dry up the excess moisture and remove all the materials that have been infested by the mold. Get rid of items like carpets and wallpaper that cannot be cleaned and dried. First spray the area with water to keep down the dust and debris while you are removing the items. The materials should then be sealed in a double-bag and the bag wiped clean to prevent the mold from spreading to other areas.

If the area with indoor mold cannot be removed, it should be cleaned with soap or detergent. After that, it helps to disinfect the area with a diluted bleach solution. Do not sand or scrape the surfaces and avoid using a hammer to remove drywall that is mold-infested.

If the affected area is larger than 10 square feet, you may need to turn the job over to a professional mold remediator. You can find companies that specialize in restoring homes damaged by fire and water whose services include indoor mold remediation.

Share

What Is Deemed Acceptable Indoor Airborne Mold Spore Levels In Ontario?

Question: Is there any government or industry standard as to what is deemed an acceptable indoor airborne mold spore levels in Ontario? The electrical inspector refuses to come on our property even though we have had several air test performed. The qualified tester says we have samples of mold but found them to be acceptable. I was hoping for some clarity on this matter.

Answer: Currently there is no government or industry standard as to what is deemed acceptable indoor airborne mold spore levels. However, it’s generally agreed that mold in indoor environments is a health hazard. However, the higher the airborne mold spore levels in a building the higher the health risk. In 2007 Health Canada published the Residential Indoor Air Quality Guidelines: Moulds.

This is what Health Canada’s Residential Indoor Air Quality Guidelines say about exposure limits:

Health Canada considers that mold growth in residential buildings may pose a health hazard.
Health risks depend on exposure and, for asthma symptoms, on allergic sensitization. However, the
large number of mold species and strains growing in buildings and the large inter-individual variability
in human response to mold exposure preclude the derivation of exposure limits. Therefore, Health Canada recommends:

  • to control humidity and diligently repair any water damage in residences to prevent mold growth; and
  • to clean thoroughly any visible or concealed mold growing in residential buildings.

These recommendations apply regardless of the mold species found to be growing in the building.

Further, in the absence of exposure limits, results from tests for the presence of fungi in air cannot be used to assess risks to the health of building occupants.

So currently there is no acceptable or unacceptable indoor airborne mold Spore levels in Ontario.

Share

Do You Have The Normal Values For Various Types Of Mold?

Question: Do you have the normal values for various types of mold, i.e. Cladosporium cladosporioides? Thank you.

Answer: Currently there are no widely accepted normal levels for mold spores. In the literature, 3000 spores per cubic meter of air is quoted as the allergenic threshold for Cladosporium. More recently a figure of 4000 spores per cubic meter of air has been cited. For Alternaria, 100 spores per cubic meter of air is cited in the literature as the allergenic threshold.

References

  • Hollins, P.D., P.S. Kettlewell, M.D. Atkinson, D.B. Stephenson, J.M. Corden, W.M. Millington and J. Mullins. Relationships between airborne fungal spore concentration of Cladosporium and the summer climate at two sites in Britain. International Journal of Biometeorology Volume 48, Number 3, 137-141.
Share

How Do We Find This Mold And Get Rid of It?

Question: My son is having a severe allergic reaction to this mold. How do we find it and get rid of it? Could he have gotten in by playing outside in the woods?

Answer: To be able to answer your question, we need more information about this mold. However, if you suspect mold in your home, you may consider bringing in a professional to conduct an investigation.

Share

How Long do Mould Symptoms Typically Last?

Question: My question regards how long mould symptoms typically last. I have found what appears to be a mould growing on my window. It is gooey in texture and clear in colour. The window is often wet with condensation to the point it drips down continually for hours on end.

I am not sure if the jelly like characteristic of the mould is because of the water or because that is it’s composition. Recently the mould was disturbed by somebody in our room (they opened the window). My wife had just left the room for a while with our infant daughter (10 months) for medical reasons as this person had to come in. When she came back into the room fifteen minutes or so passed when her nose started running. Being allergic to mould she immediately told me it had been disturbed and she could smell it. She now has had for the last four days what appears to be cold like symptoms. Are these mould symptoms? What should we do? How long do mould symptoms typically last? Does my description of the mould sound at all like anything particularly dangerous? Would this be a danger to our daughter? We don’t actually have anywhere else we could live so this is important to us how we handle it. Could putting plastic window covering that seals with heat keep it from the room or would it disturb it too much? It wasn’t here in the summer but seems to have happened from the washing that we’ve hung in the room drying without any ventilation. We’re concerned for our daughter so if you could let us know asap we’d so appreciate it. As I said, we live in this room and she is in the room nearly 24 hours every day. Thank you for your time.

Answer: I haven’t found any scientific literacy that documents how long mould symptoms last. In my opinion, this could depend on the extent of damage the mould had done on an individual’s health or immune system. The extent of damage will depend on an individual’s resistant to mould exposure. Some people experience mould symptoms only when they are in a mouldy environment.

From the description you’ve given, it’s difficult to tell what type of mould it is and whether it’s dangerous or not. However, all moulds are potentially a health hazard.

Covering the mould with plastic is not a good solution since spores could still find their way into the air you’re breathing. You’ve already identified the cause of the mould growth on the window, that is, condensation due to poor ventilation and the washing that you’ve been hanging in the room.  The solution is to correct the moisture problem and to clean the existing mould. I would suggest you look for a qualified professional who could advise you on how to improve the ventilation, reduce condensation, and also how to remove the mould without spreading spores in the room. Read “ Mold Removal Guidelines ” to learn more about mould removal.

After mould removal the mould symptoms your family is experiencing are likely to disappear.

Share

Should I Seek Medical Attention?

Question: I have been sleeping in a damp room with a large amount of mold on the walls for about 4 months (which is in the process of being cleaned). Is this dangerous, should I seek medical attention even though I am in good health?

Answer: If you’re feeling OK then you don’t have to worry. However, I would suggest you have the mold cleaned up as soon as possible. Prolonged (long-term) mold exposure could cause health problems, including asthma, allergies or respiratory problems.

Share

Are These Moulds Harmful To Me?

Question: I have had a Kidney transplant. In the building that we rent we had a test done for mould and found high levels of Penicillium and Aspergillus. With a weakened immune system, are these moulds harmful to me?

Answer: People with weakened immune system (i.e., immuno-compromised or immuno-suppressed individuals) are highly likely to be infected by opportunistic pathogens (disease causing organisms). Aspergillus fumigatus and Aspergillus niger, for example, cause a disease called invasive aspergillosis in the lungs of immuno-compromised individuals. This happens when immuno-compromised individuals inhale airborne spores which then start growing in the lungs. Penicillium marneffei causes penicilliosis in humans. This may involve skin papules that are acne-like symptoms and also diarrhoea and fever in HIV AIDS patients.

Healthy individuals are usually not susceptible to opportunistic infections from the common saprophytic fungi.

Share

Could I Save My Clothing, Books, etc After Mold Contamination?

Question: Hi, I was wondering if you could answer a question for me. It is so hard to get any advice on this subject. My apartment had toxic black mold (Stachybotrys, Aspergillus, and Penicillium). It was a small area under a window. I was very sick and still do not know if I was just “sick” (flu like) or if it was the mold. Anyhow I moved out in May, and have been trying to salvage what I can from my apartment. I was wondering if I could save my clothing, books, etc? I have a microbial cleaner that says it can be used on paper. What do you think? There is no visible mold on any of my things. The mold was on the wall and in the air. Thank you so much for your time. I appreciate it so much.

Answer: Yes, you could save your clothing, books and other belongings. If the apartment had only a small amount of mold, I don’t think your belongings are significantly contaminated with mold spores. However, if you’re still concerned you could have the items that cannot be washed, cleaned with a HEPA vacuum. I would not recommend use of microbial cleaners unless it’s something already approved for that purpose. Items that can be washed should be washed and then dried properly immediately. For additional information refer to the articles below:

Share

Can Mold Sampling Give Us Information As To Health Risks?

Question: I am seeking information for a community hall regarding mold sampling. This hall is used for meetings and occasionally food is prepared and served. There has been a multi-year history of clean water seepage but the source has not been identified yet. Walls and surfaces have large areas of primarily black coloured mold, some green and some a peachy colour.

There is a musty odour too. My questions are:

  • With the limited exposure most people have to the environment, can mold sampling give us information as to health risks for public and for the cleaning staff?
  • If we send samples, and worst case scenario: mold is toxic, do you provide info on proper cleanup procedures?
  • Would tape method of mold sampling be adequate for assessing the above?
  • Areas mentioned have recently been bleached/washed and none are visible today; how long should we wait to do mold sampling?

Thanks for your help.

Answer: Mold Sampling on its own cannot provide information as to the health risks for public and the cleaning staff. This is because there are no exposure limits for airborne mold spores. Health Canada states that “in the absence of exposure limits, results from tests for the presence of fungi in air cannot be used to assess risks to the health of building occupants”. That does not mean mold sampling is not necessary.  Read the article “Is Sampling and Testing for Indoor Mold and Bacteria Necessary?” Regardless of the type of mold, i.e., whether toxigenic or not, the procedures for cleanup are the same. A mold cleanup procedure is determined by the amount of mold growth in square footage. You’ve mentioned that the contaminated area had recently been bleached and no mold is visible. Since the source of water has not been identified and corrected, mold growth will reoccur. I would suggest you consult a professional knowledgeable in building science to help in identifying the source of water and assess the extent of mold growth. It’s possible there could be more hidden mold growth than what was visible before bleach was used.

If you have further questions regarding mold sampling please contact us at 604-435-6555 in British Columbia or 905-290-9101 in Ontario.

Share

Would Mold Develop Over Time?

Question: I am wondering if you have a foundation problem in a house and water comes in when the snow melts and when it rains would mold develop over time? We were going to move in a house and the landlord says that she removed the mold. It is a damp, old basement and the wood boards are rotting because of either mold or water. She says it only rained in there once but i don’t think so. Would there likely be mold in the walls, underneath the cardboard? When the landlord tells me it has been removed do I believe her or would a mold/air specialist have to come in? There is also insulation exposed. I heard mold can grow there. My mom had a bad reaction from being in the basement. Please give me your advice.

Thanks.

Answer: The conditions you have described would definitely support mold growth. Going by your description of the place, I would suggest you look for another house. Exposure to damp and moldy environments may cause a variety of health problems. People who are sensitive to molds may experience nasal stuffiness, throat irritation, coughing or wheezing, eye irritation, or, in some cases, skin irritation. People with mold allergies may have more severe reactions. Those with weak immune system or with chronic lung illnesses and other respiratory diseases may get serious infections in their lungs when they’re exposed to mold.

Share