Spray foam on attic deck to stop mold

I am working with an insulation company who has already applied 2" of closed cell foam over the deck of a roof deck that has been remediated for mold twice. It was thought by spraying the foam, there would be no chance of the mold coming back.  This is a million dollar home in the Chicagoland area and homeowner is trying to sell the home but a private home inspector says the foam will shorten the life of the roof and he has scared off perspective buyers with his talk.  I have told the insulator, that I am not going to say anything that I am not sure of or have some documentation.  

I agree the home owner should have solved the source of the mold before doing anything to the home first.  Unfortunately, we are beyond that point.  I am told that the ventilation has now been taken care of and I plan to check the ventilation out this coming week. If anyone has anything to add to the conversation or thoughts to help the homeowner sell his home and have the buyer feel comfortable with the purchase, please let me know.  I have been doing this for 9 years and never had a case like this and want to make sure not to say anything that will get my tail in the ringer.

Thanks

Jerry Needham

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Comment by William H Nickerson on April 13, 2018 at 9:02am

In Chicago you have the headquarters for Passive House US. You should reach out to them and ask if they know of anyone willing to run a WUFI software case file on your conditions. This is what that software was designed for. It could be a win for all parties.

Comment by Brad Cook on April 12, 2018 at 11:45am

molds needs oxygen, moisture, food and heat (above roughly 40 degF). The SPF will essentially remove O2.

If the SPF was applied to the interior of the roof deck, the 2" would be a vapor barrier. If it was applied to the exterior, you could have condensation on the interior surface, depending on climate and RH.

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