The thickness of R38 batt insulation is usually about 12 inches. This substantial thickness helps to provide excellent thermal resistance, making it a popular choice for insulating attics and other areas where maintaining a high level of energy efficiency is crucial.
Remove as much spray foam as possible with a scraper or blade, then use a rag dampened with mineral spirits or acetone to clean any remaining residue from the surface.
For stapling insulation, 20-gauge staples are recommended, though 19-gauge and 23-gauge staples can also be used.