The Inspection Report
Construction Phase Inspections
One Year Warranty Inspection
Duct and Envelope Tightness (DET) Verification
The tightness of the building’s envelope is tested by using a blower door. The apparatus is set up in an exterior doorway, with all exterior doors and windows closed, and all interior doors opened. The home is then depressurized to -50 Paschals, and the amount of leakage is recorded (CFM@50). By using the volume of the home, the ACH@50 is then calculated, and the home passes the code requirement if the ACH@50 is less than 7.
Additionally, the HVAC ducts are tested at the rough-in stage for total leakage (must be less than 6 CFM leakage per 100 sq. ft. for the system to pass), or the duct leakage outside of the building’s conditioned area is tested at the completion of construction (must be less than 8 CFM per 100 sq. ft. for the system to pass). There are several testing methods; the test method performed by GHIS is by using a Duct Blaster along with the blower door post-construction, testing the duct leakage to the outdoors.