All attic/ceiling energy-efficiency measures begin with some ceiling plane air sealing work followed by insulation top-ups or replacement. With proper preparation, air sealing spray foam insulation may be used for both purposes. To ensure adequate adhesion when using sealants or spray foam for air sealing, clean all areas requiring adhesion. Guidance is provided here to first seal all common ceiling penetrations and interfaces and then to upgrade insulation levels. Additional procedures and a good companion document for the work is the Guide to Attic Air Sealing by the Building Science Corporation.