Mold Bacteria Consulting Services

Serving Ontario and British Columbia

  • Home
  • About MBS
  • Services
    • Mold Inspection
    • Bacteria Testing
    • Bioburden Testing
    • Legionella Investigation
    • Online Training
  • Equipment/Supplies
  • iBlog
  • Kids’ Corner
    • School Science Fair Projects
    • Bacteria Pictures
    • Fungal Pictures
  • Contact Us
  • Login
You are here: Home / Archives for moisture

The Indoor Mold Is An Early Warning Device

Jackson Kung'u

Mold Growth On WoodThe 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 cheese, wines such as Auslese, Sauternes and Tokaji or the protein rich meat-like product called quorn, you can thank the mold for that, too. The mold is a network of thread-like filaments. Some molds are good, some are bad. Some of the undesirable types of mold grow in the indoor environment. Apart from being a potential health hazard, indoor mold is unsightly. You usually find them in damp sections of the building such as 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.

Indoor mold is a health hazard

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 on wet organic material rich in cellulose such as wood or paper (but not on concrete or tile). It may 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.

Indoor mold is an early warning device

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.

Cleaning up indoor mold

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 (care should be taken when using bleach. It is a hazard too). 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.

If you would like to receive more information regarding our laboratory services or our prices, please call us at 905-290-9101 (Ontario). You can also complete the form below and we shall get back to you within 2 business days.

* indicates required field

 

Filed Under: Mold Tagged With: moisture, mould, sick building syndrome

Could Mold Be Making Us Sick?

Jackson Kung'u

Question: I have a window that leaks and the hardwood floor under both windows is rotten. The property manager said she can’t fix the leak because “all the windows leak”. My boyfriend and I have been really sick and the doctor can’t explain why. Is there a high chance mold could be growing under the floor, that’s making us sick? And do you know what city service in Vancouver I could contact about this situation?

Answer: If there are leaks it’s very likely that there is mold growing on the water damaged materials. It’s difficult to say whether your sickness is due to mold. However, indoor mold and dampness have been associated with ill health. People who are sensitive to mold may experience symptoms such as nasal stuffiness, throat irritation, coughing or wheezing, eye irritation, or, in some cases, skin irritation. Individuals with a history of mold allergies may have more severe reactions. People with weak immune system may get serious infections in their lungs when they are exposed to molds such as Aspergillus fumigatus. Such people are advised to stay away from areas that are likely to have mold.

I am not sure which city service in Vancouver you could contact about this situation but you may want to try their public health department.

Filed Under: Fungi Tagged With: moisture, mold symptoms

I Have Mold On My Bathroom Walls, What Can I Do?

Jackson Kung'u

Question: I recently moved into a new home and I am getting mold on my bathroom walls and ceiling. It appears that the last tenants have just painted over the mold, so it keeps coming back. Is there anything I can do to correct this?

Answer: Mold grows in buildings due to excessive moisture. You have to determine the source or cause of this excessive moisture and correct the problem. Some of the ways to reduce humidity inside the house include:

  • Venting showers and other moisture-generating sources to the outside.
  • Controlling humidity levels and dampness by using air conditioners and de-humidifiers.
  • Providing adequate ventilation to maintain indoor humidity levels between 30-60%.

Sources of mold indoors
Mold is found naturally in the environment. It’s found in soil and on dead and decaying matter. Outdoors, mold plays a key role in the breakdown of leaves, wood and other plant debris and hence helps in the recycling of nutrients. Airborne spores found indoors either originate from outdoors or could be from mold growing indoors on organic building materials.

How to recognize mold
Mold come in a variety of colors, including green, black, white, brown and orange. It can appear fuzzy or in slimy streaks. There is often a musty or earthy odour in buildings with severe mold growth.

What causes mold to grow inside homes?
Mold produces tiny spores just as some plants produce seeds for reproduction. Indoors, these spores move through the air and settle on surfaces. When mold spores land on damp surfaces, they may begin to grow and multiply.

Filed Under: MBL Answers Tagged With: bathroom, ceiling, moisture

What Are The Health Issues We Face?

Jackson Kung'u

Question: We rent a 2 bedroom basement apartment in North Vancouver, BC. It does rain a lot, and a wet puddle forms in my son’s bedroom. This house is 60 years plus, but we just found mould growing under my son’s bed, black and brown mushroom looking, and we have only lived here for 10 months. We have a small dog, what are the health issues we face? I am 56 and I have a heart disease. My son is 24 and has breathing problems. We have a small 7 year old bichon frise that sleeps a lot.

Answer: There are a number of health effects associated with exposure to indoor moulds. Exposure to indoor mould mainly occurs through inhalation of airborne spores. Therefore, people exposed to indoor mould are likely to experience respiratory problems. Health effects, however, depends on the amount of mould present, individual’s sensitivity to mould and the type of mould. In an indoor environment hundreds of different kinds of mould are able to grow wherever there is moisture and an organic substrate (food source). Mould can grow on building and other materials, including: the paper on gypsum wallboard (drywall); ceiling tiles; wood products; paint; wallpaper; carpeting; some furnishings; books/papers; clothes; and other fabrics. Mould can also grow on moist, dirty surfaces such as concrete, fiberglass insulation, and ceramic tiles.

I would suggest you ask the landlord to hire a professional who could assess the extent of mould contamination, the cause and then recommend how to correct the moisture problem and get rid of the mould.

Filed Under: MBL Answers Tagged With: health risks, moisture, mould, respiratory, spores

Mold Development Within Home

Jackson Kung'u

Question:

My question regards mold development within home resulting from delayed response to correct water leak. We had a pipe leak in the manifold of a room in our home which was also under the slab and resulted in water damage to carpeting, drywall, furniture, x-ray film, various paper documents, retail goods, decor and other personal items which were immediately moved to the living room and family room.  The damaged room is joined to the kitchen and bathroom.  Both of these rooms were also affected. The kitchen cabinetry and toe touch had an 97%-99% moisture ten plus days after the repair to the drywall in the opposing room. Upon the opened toe touch area being dried-out, it still had 19-27% moisture detected that had remained without being dried-out.

The originating room was never dried out. Upon the insurance contractor coming to dry-out the wall had dried but the kitchen area affected had not. Meanwhile the toe kicks were removed and area dried out.

However, the carpet and all other damaged house hold furniture redistributed to other rooms, as well those within the room and other household items and paper documents remained as well the open slab and drywall in the office where the repair was done.  Approximately three weeks later, I had testing done in the home as I had been experiencing health problems which had reoccurred and advanced to bilateral skin rashes on full limbs from upper respiratory, eyes, flu-like symptoms with fever, weakness, head and fatigue…

 The testing after a three week period of the repaired piping showed elevated levels of spores which were greater than five times the amount outdoors.  For instance in the room/office, Aspergillus/penicillium had a raw score of 261, at 86% and spores/m3 of air at 1749. Other fungal spores were ascospores, Cladosporium, smuts/myxomytcetes which were present. Total fungal spores/m3 was 2044, 305 raw and 100%.

The kitchen had 275 spores/m3 for aspergillus/penicillium, 147 spores/m3 for Cladosporium, 13 rusts spores/m3, 7 smuts/myxomycetes spores/m3, with total fungal spores at 456.  There was one area under the cabinet that had a dark spot which was sampled. The spot was located at the edge near where the toe kick would connect. The spot tested as “major” Aspergillus/penicillium while there were no visible signs in the office of spots.  However, there were two strips of molding that were in the bathroom which had been removed from the office upon repair to the pipe weeks prior, one tested showed an “abundant” aspergillus/penicillium-like fungi.

The week of Thanksgiving, I looked under the cabinet where my pots/pans glass cookware are stored-which would be the wood in the area of the toe kick which holds the cookware’s shelf. I noticed spots from end to end on the full board.  I have not looked since.  However, I covered the registers of the office and kitchen.

In the living-room I noticed items acquire mold that were sitting on top of the file cabinet which was a piece of wood furniture affected and in front of the dry wall with moisture and on top of the carpet. These items were placed in plastic bags tied together and put back on the file cabinet. On the 11th of November, canvas bags which are full of documents and other items were in the living-room in a large plastic tub. Fungal mold-like growth was present and removed to the garage.

Last week, Tuesday we had a visit from an adjuster(claim transferred to a different county and rep after complaints of contractors from Insurance company not following through nor getting started beyond photos, diagrams, and measuring in removing and cleaning etc.) who saw the areas. She was to send someone out that day to remove the carpet, remaining things in the room, clean, remove powder from results of work with wet saw in the room and to have someone come and put a suction unit in the room to remove spores and exhaust them outside of home-(is this appropriate, could they not re-enter with open windows or the like?). How about the other rooms which could highly likely have colonies as a result of location to the contaminated rooms and the pieces from those rooms disbursed in other places.

The adjuster assured us of action being taken that day and would contact her contractors to come out that evening. In addition, she would talk to her manager and review file as it was reported they do not cover mold-but she was told the insurance contractors delay from mid October to well into November is an issue.

Here we are in December and items are still unchanged nor removed. Carpet should have been gone among others.  Therefore the insurances contractor is liable and should be responsible for those areas related to microbials.  She did say the insurance can help out up to 5k’s. Again, we were assured in the meantime work would get going that evening or in the morning.  That late afternoon she phoned and left a message that no one will be out that evening.  She had not been able to receive contact from her manager either.  However, she needs to ask me a question.  I have not heard from her since returning her call.

On Saturday, the 11th of December, I went to the insurance office expressed my frustration of this situation in which the agent was amazed and reported this should not be like this.  They never get complaints on home insurance and it should have been taken care of within a few days not a few months and nothing has happened. The agent sent an urgent notice to the adjuster and her manager. Needless to say there has not been any contact yet.

 I have been having further health problems as a result of the contamination/fungal environment. This would make the fourth time I have sought medical attention.

I have made every effort to remove myself from the mold contaminated areas while I try to limit my time in the kitchen and family room with an exception on Sunday morning.  I try to remain upstairs which is open to downstairs except for the bedrooms.  Could the colonies multiply throughout the house with the conditions described and find their way upstairs?  I think that they may have not only affected my health, but me physically. I have inflammation, advanced edema, muscle/joint pain, red eyes, and enlargement of my mid-section. Could colonies have developed within my body? I am active and work out four times a week-1.5hrs, but I’ve been noticing physical challenges of things usually included in my work out and some involve respiratory. How can these symptoms/conditions be corrected or can they be permanent? How about the other health conditions?

 What precautions, actions, remediation and additional evaluations should be taken as a whole? Thank you.

Answer:

I would like to summarize and answer your questions as follows:

  1. The adjuster was to send someone out to remove the carpet, remaining things in the room, clean, remove powder from results of work with wet saw in the room and to have someone come and put a suction unit in room to remove spores and exhaust them outside of home. Your question is whether this method was appropriate and whether the spores could re-enter through the open windows. To me this sounds like it was an appropriate method of cleaning up the mold. Most remediation companies follow mold guidelines such as “Guidelines on Assessment and Remediation of Fungi in Indoor Environments” developed by the New York City Department of Health and Mental Hygiene. In Canada, contractors may use the Canadian Construction Association’s Mould Guidelines for the Canadian Construction Industry or the Environmental Abatement Council of Ontario’s Mould Abatement Guidelines. These guidelines are available online so you want you can refer to them.
  2. Your other question is whether the colonies could multiply throughout the house given the damp/wet conditions you have described. The answer is yes. If the moisture problem is not corrected mold will continue growing.
  3. You have experienced symptoms/conditions that you think are due to mold exposure and you wonder how these symptoms/conditions could be corrected. Generally symptoms associated with mold exposure should disappear once a person is no longer exposed to mold. However, permanent symptoms may develop if the individual was exposed for many years.
  4. You also wanted to know what precautions, actions, remediation and additional evaluations that should be taken as a whole. Since you’re not feeling well, I think the first thing for you is to move out of the house. Then hire a qualified professional to assess the extent of mold contamination and recommend the appropriate level of remediation.

I hope this helps. If you need more information, please contact us again.

Dr. Jackson Kung’u.

Filed Under: MBL Answers Tagged With: basement, fungal, Fungi, moisture, spores, water damage

  • 1
  • 2
  • Next Page »

What’s New?

  • Indoor Air Quality Testing in Toronto, Ontario
  • Air Quality Testing in Vancouver, BC
  • Mold Testing in Toronto, Ontario
  • Mold Testing in Vancouver, BC
  • Salmonella food poisoning and symptoms
June 2025
S M T W T F S
1234567
891011121314
15161718192021
22232425262728
2930  
« Jun    

Salmonella food poisoning and symptoms

Salmonella food poisoning has been a growing concern in recent news. It has frequently lead to recalls of beef, salads and organic products and, even peanut butter products. Salmonella food poisoning occurs when one eats raw or undercooked foods such meat, poultry, eggs or egg products. Properly cooked food can get contaminated with Salmonella if […]

Legionella pneumophila – Guidelines for Laboratory Interpretation

Legionella pneumophila is a Gram negative, aerobic bacteria that is characterized as an opportunistic pathogen. It is the cause of Legionnaires’ Disease, a severe form of pneumonia and, it is the cause of Pontiac fever, a non-pneumonic form of L. pneumophila infection. Legionella spp.’s mode of transmission is through aerosols or aspiration of contaminated water. The Public Health […]

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. […]

Copyright © 2025 . Mold & Bacteria Consulting Services (MBS). 1020 Brevik Place, Unit 1A, Mississauga, L4W 4N7. Log in