Quality Insulation Installation (QII) FAQs

These frequently asked questions explain how Quality Insulation Installation (QII) fits into California project planning and field verification. The approved compliance documents and applicable code-cycle procedures control when QII applies to a particular project.

For 2025-code projects, consult the CEC’s Reference Residential Appendix RA3.5 for the controlling QII installation and rater-verification procedure.

What Is QII?

QII is a California field-verification measure for insulation installation. When it applies, the rater compares the visible work with the project documents and evaluates criteria such as material and R-value, coverage, gaps, avoidable compression, fitting around penetrations, and alignment with the designated air barrier.

QII verifies the inspected installation; it does not by itself guarantee future utility bills, comfort, indoor air quality, or whole-home performance.

Who Performs a QII Inspection?

A certified ECC rater (formerly HERS rater) performs California QII field verification within the scope of the rater’s certification and Provider workflow. California ECC verification is distinct from a national RESNET HERS Index rating, which is a separate whole-home energy rating.

For more detail on responsibilities and documentation, read the ECC rater’s role in QII.

When Does QII Apply?

QII may appear as a field-verified measure in a performance model or as part of an applicable prescriptive package. Project type, climate zone, compliance path, code cycle, building scope, and approved documents all matter. Additions and alterations can follow different provisions from new construction.

Ask the energy consultant to identify the applicable measure before insulation is ordered or scheduled.

When Is the Inspection Performed?

Rough-in verification is scheduled while the relevant insulation and air-barrier details remain visible, before drywall or other finishes conceal them. Later-stage verification depends on the applicable procedure and project scope. Coordinate dates with the ECC rater early because trade sequencing and access conditions vary.

What Does the Rater Review?

The exact checklist follows the applicable procedure and project documents. Common review points include:

• Insulation type and R-value
• Coverage, gaps, voids, and avoidable compression
• Fitting around pipes, wires, boxes, and other obstructions
• Air-barrier alignment and required backing
• Coverage at rim areas, kneewalls, attic edges, and other scoped transitions
• Product labels and installation documentation

Material-specific requirements should come from the approved assembly and manufacturer instructions, not a generic rule applied to every project.

What Happens When a Correction Is Needed?

The rater documents the affected location and condition according to the applicable workflow. The builder or insulation contractor completes each correction, preserves useful before-and-after documentation, and requests reinspection when the listed items are ready. Timing and fees depend on the project and service agreement.

The QII correction notice guide organizes common responses by construction stage and explains what to document before reinspection.

Does QII Improve Energy Performance?

Gaps, voids, compression, and misalignment can reduce the effective performance of an insulation assembly. QII provides field verification of installation quality when the measure applies. Actual whole-home energy use still depends on the full envelope, HVAC systems, climate, controls, occupancy, and other factors.

How Should a Team Prepare?

Use the current compliance documents, brief the insulation crew before work begins, complete rough-ins that affect the thermal boundary, protect the installation from trade damage, keep scoped areas safely accessible, and have labels or installation records available. Do not substitute materials without coordinating with the energy consultant and rater.

Builders, superintendents, and insulation contractors can contact Poppy Energy to confirm scheduling needs and prepare for a project-specific QII inspection.