Question: Hi there, I was hoping to get some clarity on some potential mold issues. We currently rent out a basement unit. We have never had issues before but the current tenant refuses to run the dehumidifier, as a result her wicker headboard got moldy. We had an air quality test that showed the total airborne fungal spore count for the outdoor sample was 11,000 per cubic meter and the indoor count was 43,000 per cubic meter. The testing company said they will come in and clean visible mold and that should take care of it after more indoor tests. I am just worried about spending another $600.00 and still have the same issues. Is this the correct process, should we be allowing the tenant to move back in after this 'surface' clean? Are those results worrisome? Any thoughts would be great. Thanks.




Answer: The testing company is right in suggesting a cleanup of the visible mold. However, cleaning the mold without addressing the underlying cause is a waste of resources since the mold will grow again after a few months if not weeks. The best way to control mold growth in a building is to correct moisture problems in addition to cleaning. You may get more information on mold removal at the Canadian Construction Association's website at http://www.cca-acc.com/homepage_e.asp.

Question: We live in a new home (completed Aug2006). Our house has been tested for mold and the tests have found wet plywood sheathing(>17%) and elevated levels of airborne fungal spores - in particular, the Aspergillus/Penicillium. My husband and I have both had coughs since December/2007. Should I be asking my doctor to do any specific tests? Our house was drywalled and insulated 2 months BEFORE the tarpaper and siding were installed, thus the drywall and insulation was saturated several times during the June/2006 rains. Do you have any other advice for us?


Answer: It is possible the cough is not related to mold. However, I would suggest you consult your doctor. Also, since the tests have indicated elevated levels of Aspergillus/Penicillium, you may want to hire a professional to assess the extent of mold contamination and recommend appropriate level of remediation.

Does mold contribute to respiratory disease and allergic reactions? The answer is yes. This happens when susceptible individuals inhale excessive amounts of spores and other tiny fragments of mold. Prolonged exposure to mold spores can also elicit sensitivity.

What are mold spores and how do they affect us?

• Mold spores are tiny structures produced by molds for propagation.
• Inhaled spores and mold fragments can cause allergic reactions such as runny nose and eyes, and asthma-like symptoms.
• Prolonged exposure to unusually large numbers of spores and fragments can result in the development of allergic alveolitis.
• Spores of pathogenic fungi if inhaled can infect the respiratory system and the rest of the body.

Generally there are less spores indoors than outdoors. Therefore, unless there is actively growing mold in a home the amount of mold spores present in a home are very unlikely to affect the occupants. However, in industrial environments the concentration of spores can be very high. The types of molds present in industrial environments depend on work carried out and the prevailing conditions.

Which environments are higher risks?

• Mushroom farms,
• Saw mills,
• Paper mills,
• Composting areas,
• Waste disposal sites
.
• Demolition sites,
• Agricultural environments, e.g., animal farms.