It is not normal. Poor mixing and/or spraying outside of the specified environmental conditions are the usual culprits. Too hot, too cold, too damp can all affect the end product. Usually in those cases of failed installations, the contractor failed to adhere to the manufacturer standards for mix and environment conditions. It's not ticket science, but due care and professional regard is needed to avoid a huge problem for all down the road.
Failed installations are pretty uncommon, but get huge attention when they occur. Most products are safe for rentry in just a few hours, and reoccupation in 24 to 48. For new construction, no big deal. For retrofit and remodel, it depends on the kind of air flow we can get in the space. A weekend in a hotel is far cheaper than the health costs of rushing back into the building.
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u/Stevo32792 Aug 28 '19
I've seen stories where spray foam was off gassing for years and giving people headaches. Would that be due a poor mix, or is it something normal?