Mouldy Basement

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8/9/2011 at 5:50:28 PM

We have encountered a black mould issue this spring/summer due to the high water table and the condition of our basement. We have a 100 year old home with 2/3 dirt crawl space and 1/3 concrete basement. The dirt is creating high humidity, and along with the moisture, mould was able to thrive. While we have dealt with the mould issue, we are trying to prevent this from happening in the future. We called in 2 Insulation companies for quotes so far, thinking that insulating the inside foundation walls would help. We have conflicting quotes ie: open celled foam vs. closed cell foam. To me, both of these create their own issues, thereby not really fixing the problem. I have read on line that it is necessary to encapsulate the baserment with 20 mil poly. In the US, it is CLEANSPACE. Does anyone here install a similar system? At what cost? Approx. 900sq.ft. of space.

We are still getting that dreadful musty basement smell coming up from the basement.

We have a 10 day to 2 week installation window. We would like to have the furnace and air conditioning along with the duct work cleaned and serviced, but don't see the point until this basement is sealed. Please help

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Date/Time8/17/2011 at 8:30:26 PM

Hi Karen, it looks like nobody wants to take a swing at this one. In general, you need to deal with the moisture / water coming into your basement and this is best done from the outside through foundation waterproofing and weeping systems as well as any necessary grading to direct the water away from the foundation. A minimum of 2" of closed cell foam will provide an excellent vapour barrier on the inside if / when your foundation is actually waterproof as well as being R 12 - R 14 insulation. You also have to deal with sealing up the dirt floor on the inside. I haven't heard of the brand you mentioned but I have heard of people using everything from 6 mil poly to vinyl pool liner material which sounds like a similar idea. This should be overlapped and sealed at every joint as well as to the walls at the perimeter. You may be able to install it first and then spray foam over the edges to seal. You also have to ventilate to deal with any future moisture. Once you have insulated, you can probably run 1 or 2 ducts off of your furnace into the space to ensure some air movement. This will have the added benefit of heating the floor above and avoiding any condensation build up. Hope this helps!

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