Spray foam can be a problem for several reasons related to health, installation, and building issues. During installation, spray foam chemicals including isocyanates can cause respiratory irritation, asthma, and chemical sensitivity for installers and occupants if not properly ventilated and if people do not vacate during curing, which takes 24 to 72 hours. Improperly mixed or installed spray foam can off-gas for long time, cause persistent odor, and fail to cure correctly, leading to expensive removal. Spray foam can trap moisture against wood framing if roof leaks, causing hidden rot and mold because it is difficult to inspect. It can make future renovations, electrical work, and roof repairs difficult and costly because it adheres strongly and covers framing. In attics, spray foam can cause issues with mortgage and home sales in UK due to concerns about hidden roof damage. It can also be problem if it blocks soffit vents causing ventilation issues. So spray foam problems stem from improper installation, health risks during curing, moisture trapping, and difficulty of removal and inspection.
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