Odor problem in attic after spray foam applied
I am looking for any advice or suggestions with regards to a situation we are now dealing with in my home after changing our vented attic to a non-vented attic or semi-conditioned space.
Let me provide some background information. About 3 months ago an insulation company used the Demilec Sealection 500 product and sprayed our entire attic space below the roof. Prior to this we did not have any smell in this attic besides a typical attic smell that was likely not venting properly. The spraying was completed over a 2 day period while the temperature outside was around 90 degrees. The home is located in the Northeast. The attic is only accessible through pull down stairs from the ceiling. Following the spraying the only ventilation that took place was to keep all of the windows open on the bedroom level below with various fans running in some windows. This took place for several days to continue to try and ventilate the space. After a week or longer there continued to be a strong chemical odor that was coming through HVAC ducts as well as through recessed lighting and bathroom ventilation fans. The insulation company came back and said they had spoke with the manufacturer and it was possible that the fiberglass insulation that remained on the floor would need to be removed because it could be holding onto the odor from the spraying. There seemed to be some improvement following that removal, but the overall smell has continued to remain since that time. The odor drops through recessed lighting and bathroom fans and is stronger in certain areas of the bedroom level.
They came back again and hooked up a special ventilation fan to our attic door and have vented out the attic for 4 days. The odor continues to exist. Demilec is now sending a representative to come and take samples of the air and foam. Our concern is that we are potentially breathing in toxic air or something else is reacting in the attic space. We will wait and see what the results are from Demilec. We just are not sure what to do if they say everything is fine or if they say there are problems.
Does anyone have any experience dealing with this? Are there any known solutions? Has anyone been involved in a situation where the spray foam has to be removed? Can it be removed? Any help or advice would be appreciated. Thank you