Spray foam insulation is completely safe and fit and should not cause any health problems or any change in the structural integrity of your property. The overall cost of spray foam insulation per square metre depends on the insulation thickness, area, and size, spray foam insulation is more expensive insulation than other insulation but it can warm your home for long time in the winter season and in the summer season to stop outside heat. So all over it can save your monthly energy bill up to 40%.