At what stage is the insulation installed?
For new construction or renovations, the insulation is installed after the windows, doors and roof systems are in, the electrical, framing and plumbing inspections are complete, and after any other electrical or mechanical system located behind the drywall is installed. It is the last installation to take place before drywall installation.
On existing homes, the spray foam insulation can be installed to the attic, roof line, and sub-flooring to seal in the house. It is more cost effective to leave existing interior wall insulation in place.