BLOG Getting ready for a Quality Insulation Installation (QII) inspection for Homeowners and Builders May 18, 2025

If you’re building a new home or undertaking major renovations in California, chances are you’ll need to pass a QII (Quality Insulation Installation) inspection. But what exactly does that mean — and how do you prepare?

At A H.E.R.S. Rater, we specialize in verifying insulation installations according to California’s strict Title 24 energy code. Let’s break it down in plain English, so your project passes the first time.

What Is a QII Inspection?

A QII inspection is a mandatory check that ensures your insulation is installed correctly — not just that it’s there, but that it’s effective. It’s part of California’s energy code (Title 24), and it applies to new builds and remodels aiming for high energy efficiency.

A certified HERS (Home Energy Rating System) rater comes in and looks at how well the insulation is installed in your walls, ceilings, attic, and floors. The goal? Minimize air leaks, gaps, compression, and voids — all of which can make your home less comfortable and more expensive to heat or cool.

Why QII Matters

• Lower energy bills: Proper insulation reduces how hard your HVAC system has to work.
• Better comfort: Fewer drafts, more consistent indoor temperatures.
• Code compliance: It’s required to meet your energy documentation (Title 24).
• Smoother inspections: If QII isn’t passed, drywall and other construction steps can be delayed.

How to Prepare for Your QII Inspection

Here are a few key things homeowners, builders, and insulation installers should check:

1.  Walls

• Insulation must be in full contact with the wall sheathing (back) and drywall (front).
• Batts should be cut to fit snugly—no gaps, bunching, or compression.
• Around plumbing and wires, batts should be split and wrapped—not crammed behind.

2.  Ceilings & Attics

• Insulation should fill every cavity and be in full contact with the ceiling surface.
• Baffles (airflow channels) must be installed at eaves to allow attic ventilation.
• Light fixtures must be insulation-contact rated (IC) and airtight.

3. Floors & Crawl Spaces

• Insulation must be securely fastened to stay in place and touch the subfloor above.
• Rim joists should be sealed and insulated to prevent thermal bridging.

4. Special Areas

• Attic access hatches must also be insulated and gasketed.
• Behind tubs, showers, and attic knee walls insulate before these areas get covered.

Pro Tips

• Schedule the inspection before drywall goes up — once the walls are closed, it’s too late.
• Have all insulation certificates on-site from the installer, including R-values and material specs.
• Double-check that all penetrations (wires, vents, pipes) are sealed with foam or caulk to prevent leaks.

We’re Here to Help

If you’re unsure whether your insulation is QII-ready, we’ll walk you through it. At A H.E.R.S. Rater, we work hand-in-hand with builders and homeowners to get your project passed — no stress, no delays.

Call us before drywall — and let’s pass this the first time.