BPI QCI case studies
BPI QCI · Put your knowledge to work in context.
The Quality Control Inspector (QCI) credential appears in the Building Performance Institute's public certification catalog, where BPI lists it alongside its other home performance certifications. BPI describes its mission as advancing the home performance industry through nationally recognized standards and credentials that ensure homes are comfortable, healthy, safe, durable, and energy efficient, and it positions itself as a non-profit that develops those standards and credentials in collaboration with leading experts. The BPI QCI case studies are 5 cases and about 3,441 words.
1Blower Door Result Below the Program Threshold on a Complex Enclosure
A single-family retrofit is being verified under a program that requires a post-retrofit air leakage rate of 3.0 ACH50 or lower for the climate zone. The house is a 2,400 sq ft single story with 9 ft ceilings and a conditioned crawlspace connected by an open hatch.
719 words, about 4 min2Spot Ventilation Fan Flow Measured With the Wrong Reference
A quality control inspector is verifying a bathroom exhaust fan installed in a 90 sq ft bathroom with an 8 ft ceiling in a home enrolled in a program that requires 50 CFM intermittent or 20 CFM continuous operation. The installer's report claims 62 CFM measured with a flow hood at the grille.
727 words, about 4 min3Insulation Depth Verified After Drywall Is Installed
A program requires attic insulation to R-49 in a climate zone where that corresponds to about 16 inches of blown fiberglass at the specified settled density. The contractor's invoice states R-49 was installed.
670 words, about 3 min4Pressure Field Extension Fails in One Zone of a Subslab Depressurization System
A radon mitigation system was installed in a basement home with a subslab depressurization system: one suction point, a 4 inch PVC riser, and a 3.2 inch water column fan. The post-mitigation test reports 1.9 pCi/L, below the 4 pCi/L action level.
692 words, about 3 min5Conflicting Window U-Factor Documentation in a Compliance File
A program file for a new home includes a window schedule listing U-0.30 for all windows, a manufacturer's certificate showing U-0.32 for the specified model with argon, and a field label on one window showing U-0.35 for the same model without argon. The program requires an area-weighted average U-factor of 0.32 or lower for the glazing package.
633 words, about 3 min