Hamilton County, TN & North Georgia · IECC Climate Zone 4A Specification
New Construction & Custom Home Insulation Packages
Whole-home thermal envelope packages, hybrid flash-and-batt assemblies, interior wall soundproofing, and energy-code blower-door readiness for new homes and additions across Hamilton County.
Quick answer
Whole-home thermal envelope packages, hybrid flash-and-batt assemblies, interior wall soundproofing, and energy-code blower-door readiness for new homes and additions across Hamilton County. Tennessee's residential energy code requires air-leakage verification (blower-door) in most new homes. We design the envelope to pass on the first test and hit the IECC Zone 4A requirements without expensive change orders.
Scope of work
- ✓Whole-home thermal envelope design
- ✓Hybrid flash-and-batt (closed-cell base + fiberglass batt fill)
- ✓Exterior wall cavity insulation and air sealing
- ✓Interior wall soundproofing between rooms
- ✓Bonus-room-over-garage isolation
- ✓Energy-code blower-door testing and readiness
Performance in IECC Climate Zone 4A
Tennessee's residential energy code requires air-leakage verification (blower-door) in most new homes. We design the envelope to pass on the first test and hit the IECC Zone 4A requirements without expensive change orders.
What drives project pricing
| Whole-home package | Typically $8,000–$25,000 ($1.50–$3.50/sq ft conditioned floor area) |
|---|---|
| Hybrid flash-and-batt | $8,000–$14,000 per sq ft of wall + ceiling |
| Blower-door readiness | Bundled guarantee to hit <3.0 ACH50 on test #1 |
Ranges are typical for the Chattanooga market before incentives; a locked quote needs an on-site measurement.
What a complete quote includes
- ✓Plan takeoff from your drawings
- ✓Envelope assembly recommendations per Zone 4A code
- ✓Air-sealing and blower-door target strategy
- ✓Sound package for interior walls
- ✓Construction-phase schedule
Frequently asked questions
- What is flash-and-batt and why use it?
- Flash-and-batt layers a thin coat of closed-cell spray foam (the 'flash') against the sheathing for air sealing and a vapor-protective layer, then fills the rest of the cavity with fiberglass batt. You get foam's air-barrier performance at a lower total cost.
- Will my new home pass the energy-code blower-door test?
- We design the air-sealing scope around the 2021 IECC code target of <3.0 ACH50 in Zone 4A (with our foam packages typically testing at 1.0–2.5 ACH50) and walk the build so the test passes on the first attempt. If a retest is needed, the scope is on us.
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