Duct Leakage Testing North Attleborough MA - Quick Facts
Local energy code in North Attleborough
- North Attleborough enforces the Massachusetts Stretch Energy Code for new construction and major renovations. IECC Climate Zone 5A.
- Massachusetts has three energy-code levels - base (2021 IECC), Stretch, and Specialized (Opt-In) - and North Attleborough is on the Stretch Code.
Duct leakage requirement in North Attleborough
- North Attleborough permits under the Massachusetts Stretch Code cap duct leakage at 4 CFM25 per 100 sq ft of conditioned floor area.
- Testing is required unless the entire duct system and air handler sit inside conditioned space; a rough-in test and a final test may both apply.
- Results in 24-48 hours with clear pass/fail documentation, filed with the North Attleborough building department.
- From $350 for the first ducted system, often bundled with blower door testing and a full HERS rating.
2026 Mass Save incentives in North Attleborough
- Duct and blower door results feed the HERS rating that unlocks Mass Save all-electric incentives: $7,500 to $25,000 per new single-family home and $1,000 to $3,750 per multifamily unit.
- Incentives require a Mass Save-approved, RESNET-certified HERS rater.
RESNET-certified · 15,000+ ratings completed · 5.0 stars across 135 Google reviews · (617) 501-6788
Duct Leakage Testing North Attleborough MA
RESNET/HERS duct leakage testing in North Attleborough — fast, precise CFM25 results your building department and energy-code file can rely on.
Duct Leakage Requirements in North Attleborough
North Attleborough follows the Massachusetts Stretch Code, which caps total duct leakage at 4 CFM25 per 100 square feet. Our raters measure your ductwork in CFM25 and document a clear pass against the 4 CFM25 per 100 sq ft limit.
| Project / code tier | Duct leakage limit | What is tested |
|---|---|---|
| Base energy code | 4.0 CFM25 / 100 sq ft | Ducts outside conditioned space |
| Stretch Code | 4 CFM25 / 100 sq ft (total) | Total leakage or leakage to outside |
| Specialized Stretch Code | 3.0 CFM25 / 100 sq ft | All ducts, regardless of location |
| Ducts fully inside envelope | Test generally not required | Air handler + ducts in conditioned space |
IECC Duct Leakage Thresholds Reference
Beyond the Massachusetts tier that applies in North Attleborough, these are the federal IECC duct-leakage limits across code editions. All values are CFM at 25 Pascals (CFM25) per 100 sq ft of conditioned floor area (CFA) unless noted.
2009 IECC
| Test stage | Measurement | Leakage limit |
|---|---|---|
| Postconstruction Leakage Test | Duct Leakage to Outdoors | ≤ 8 CFM25 / 100 sq ft CFA |
| Rough-in with AHU | Total Duct Leakage | ≤ 6 CFM25 / 100 sq ft CFA |
| Rough-in without AHU | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
2012, 2015, 2018 & 2021 IECC — Prescriptive Paths
| Test stage | Measurement | Leakage limit |
|---|---|---|
| Postconstruction Leakage Test | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
| Rough-in with AHU | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
| Rough-in without AHU | Total Duct Leakage | ≤ 3 CFM25 / 100 sq ft CFA |
2015 & 2018 IECC — Performance Path (Cost Compliance)
Leakage testing is required unless all ducts and air handlers are located entirely within the thermal envelope. There is no pass/fail threshold for duct leakage on the performance path.
2024 IECC — Prescriptive Path
| Conditioned floor area | Condition at test | Total leakage limit |
|---|---|---|
| >1,000 sq ft CFA | Space-conditioning equipment not installed | < 3 return grilles: ≤ 3 CFM · 3+ return grilles: ≤ 4 CFM |
| >1,000 sq ft CFA | All components installed | < 3 return grilles: ≤ 4 CFM · 3+ return grilles: ≤ 6 CFM |
| >1,000 sq ft CFA | Equipment not installed, ducts entirely in conditioned space | < 3 return grilles: ≤ 6 CFM · 3+ return grilles: ≤ 8 CFM |
| >1,000 sq ft CFA | All components entirely in conditioned space | < 3 return grilles: ≤ 8 CFM · 3+ return grilles: ≤ 12 CFM |
| ≤1,000 sq ft CFA | Equipment not installed | ≤ 30 CFM |
| ≤1,000 sq ft CFA | All components installed | ≤ 40 CFM |
| ≤1,000 sq ft CFA | Equipment not installed, ductwork entirely in conditioned space | ≤ 60 CFM |
| ≤1,000 sq ft CFA | All components entirely in conditioned space | ≤ 80 CFM |
How Duct Leakage Testing Works in North Attleborough
A duct blaster seals off your HVAC system and pressurizes it to 25 Pascals. The airflow needed to hold that pressure is your leakage rate in CFM25 — the lower the number, the tighter the ducts.
Common Sources of Duct Leakage We Check in North Attleborough
Most duct leakage comes from a short list of predictable weak points. Knowing where to look is what turns a CFM25 number into a fixable list of locations.
Boot & register connections
The joint where a duct boot meets the drywall is the single most common leak point — often left unsealed behind the register grille.
Plenum & air-handler seams
Sheet-metal plenums and the cabinet of the air handler leak at seams and access panels unless mastic-sealed.
Disconnected flex runs
Flexible ducts can pull loose at collars or get crushed above insulation, dumping conditioned air into the attic.
Panned-joist returns
Return cavities framed from floor joists or wall studs are notoriously leaky and can draw in unconditioned air.
Building-cavity returns
Using framing cavities as return ducts pulls air from attics, garages, or crawlspaces instead of living space.
Trunk-line joints
Long supply trunks flex and separate at joints over time, especially where they were only taped rather than sealed with mastic.
Why Tight Ducts Keep Heat In Your North Attleborough Home
Ductwork is the delivery system for every dollar of heating and cooling in a North Attleborough home. If it leaks, that conditioned air is lost before it ever reaches a living space.
A verified-tight duct system means a right-sized furnace or heat pump can deliver its full output where it's needed, steadying comfort and cutting waste.
What Your North Attleborough Duct Test Report Includes
You get a document your building department and HERS software will accept the first time — not just a number.
- ✓Documentation formatted for your HERS rating and building-permit file
- ✓A punch list of leak locations if a re-seal and retest is needed
- ✓Measured total duct leakage in CFM at 25 Pascals (CFM25)
- ✓Leakage normalized per 100 sq ft of conditioned floor area
- ✓Clear pass/fail against the 4.0 CFM25 limit that applies in North Attleborough
- ✓The test method used (rough-in or post-construction) per ANSI/RESNET/ICC 380
Best Fit for Projects Like
- Homeowners chasing comfort fixes for hot-and-cold rooms caused by duct leaks
- Multi-unit conversions where each system needs documented duct leakage results
- Retest visits after sealing failing seams and boots to confirm compliance
- Custom homes with complex duct runs that need verification before final inspection
- Projects in Specialized-Code towns that must hit 3.0 CFM25 per 100 sq ft on all ducts
Duct Leakage Testing North Attleborough MA Facts
- Duct leakage that lets humid air into cool supply runs — or moves moist air into cold cavities — can create the conditions for mold growth.
- Duct testing verifies that conditioned air stays inside the distribution system instead of bleeding into wall cavities and chases.
- When supply leaks dominate, the house runs slightly negative to outside; when return leaks dominate, it runs positive — both pull unconditioned air through the envelope.
- Supply-side leaks push expensive heated or cooled air into cavities where no one benefits from it.
Trusted for Duct Leakage Testing North Attleborough MA
Our Massachusetts Service Locations
Serving clients from our Massachusetts locations in Everett, Somerville, and Framingham.
Everett Location
371 Main St
Everett, MA 02149
Somerville Location
519 Broadway
Somerville, MA 02145
Framingham Location
68 South St
Framingham, MA 01702
Duct Leakage Testing North Attleborough MA FAQ
Get Started With Duct Leakage Testing North Attleborough MA
Fast scheduling and permit-ready CFM25 reports for North Attleborough and all of Bristol County.
Call 617-501-6788HERS Ratings Across North Attleborough and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout North Attleborough — including North Attleborough Center, Attleboro Falls, and Adamsdale. Every North Attleborough project is filed with the Town of North Attleborough Building Department, and we handle the energy model, blower door and duct leakage testing, and the compliance paperwork from start to finish.
We also serve the communities right around North Attleborough, including Attleboro, Plainville, Mansfield, Wrentham, and Norton. Our Framingham office at 68 South St is the closest of our four Massachusetts locations — see our Framingham office or call (617) 501-6788 to get a North Attleborough rating on the schedule.
