What Is Quality Insulation Installation (QII)?
QII is a verified standard of insulation workmanship. It is a credit rather than a baseline requirement — a design that claims it has to pass inspection confirming the installation methods, and that inspection happens during construction.
Workmanship, not R-value
Ordinary insulation compliance is about the specified R-value. QII is about whether the insulation was actually installed in a way that delivers it — no gaps, no compression, no voids behind wiring or plumbing, proper contact with the air barrier on all sides.
The reason this needs a separate standard is that installed performance and specified performance diverge sharply. Batts stuffed around a pipe or left slumped in a cavity carry a label saying R-15 and behave like considerably less. QII exists because the label is not the performance.
It is a credit, which changes the decision
QII is not something every project must do. It is available to be claimed, and a design that claims it gets credit for the better installed performance in its compliance calculation.
That makes it a genuine choice. Where a design is short on the performance path, QII can be the measure that closes the gap without changing any equipment or any glazing. The trade is that it commits the build to a verified standard of workmanship and to inspections.
The inspection timing is the whole difficulty
QII cannot be verified at the end. Once drywall is up, nobody can see whether insulation is in full contact behind it. Verification therefore happens in stages during construction, before the cavities are closed.
This is the practical consequence people underestimate. Claiming QII inserts hold points into the construction programme, and a framing crew that closes up a wall before the rater has seen it has destroyed the evidence. The credit is then unavailable — and if the compliance calculation depended on it, the project no longer complies.
Decide it before you rely on it
Because QII is claimed in the calculation and verified on site, it is the measure most likely to be taken by an energy consultant and unknown to the builder. That combination is how a project arrives at final inspection with a credit it cannot substantiate.
If QII is in the calculation, it belongs in the construction programme and in the subcontractor's scope from the start — not discovered at the point somebody asks for the verification.
What to establish
Whether the compliance path depends on the credit, whether the builder has agreed to the inspection hold points, and who is booking the rater. If the answer to the first is yes and to the others no, that is a risk worth resolving before framing.