Independent oversight of your building enclosure
Building Enclosure Commissioning is a quality-assurance process that ensures the design intent for a building's envelope — airtightness, thermal performance, moisture control, and durability — is carried through design, construction, and operation.
GMEC provides BECx as an independent third party, working alongside the owner, architect, and contractor from early design through post-occupancy. We test, document, and verify that the as-built envelope actually performs the way the drawings and specs say it should.
Every project is led and executed directly by Nate Gusakov — a BECxP (University of Wisconsin-Madison) with hands-on construction experience and a voting seat on ASTM Committee E06. Clients get one consistent expert from kickoff to close-out, not a revolving door of junior staff.
Scope of BECx services
Engagements are scoped to the project. A full BECx typically includes:
Pre-design consulting & OPR
Translating the owner's performance goals into a written Owner's Project Requirements document that drives enclosure decisions throughout the project.
Design review
Enclosure-focused review of drawings and specs at SD, DD, and CD milestones — with written comments flagging risks and recommending resolutions.
Submittal review
Review of envelope-critical submittals: air barriers, window and door assemblies, flashing, insulation, and transition details.
Pre-construction kick-off
On-site meeting with GC and Owner's Rep to walk through enclosure priorities, testing schedule, and first-instance testing protocols before construction starts.
Mid-progress site visits
First-instance testing of wall-to-foundation, wall-to-roof, and fenestration transitions, plus photo-documented observations during envelope installation.
Preliminary airtightness testing
Whole-building blower-door testing once the air barrier is complete, with guided leakage diagnostics to catch issues while they're still fixable.
Final compliance testing
ASTM E779 multi-point testing to document the as-built air leakage rate, with reporting formatted for VT CBES or the project's applicable code.
Test-out documentation
Final BECx report summarizing all site visits, tests, results against targets, and any outstanding items for post-occupancy review.
Who BECx is for
BECx is the right fit when enclosure performance is contractually, code-mandated, or programmatically critical to the project:
- Owners of high-performance buildings — passive house, net-zero, LEED, or institutional projects where envelope performance is a stated goal.
- Architects on complex projects — commercial, multifamily, or mixed-use buildings where envelope detailing benefits from a third-party technical reviewer.
- Code-driven projects — buildings subject to commercial energy codes requiring enclosure commissioning, or state stretch-code programs like VT CBES.
- Builders delivering performance guarantees — projects where the contractor is on the hook for a measured airtightness target.
Track record. On the Stoney Hill Manufacturing Building A project (Bristol, VT, ~25,353 ft²), GMEC's full BECx process delivered a final airtightness result of 0.08 cfm₇₅/SFBE against a 0.13 target. On the Marble Valley Regional Transit District Offices (Rutland, VT, ~8,000 ft²), we delivered 0.07 against a 0.20 target.
Not sure whether your project needs full BECx or something lighter? The earlier we talk, the more options there are — OPR development and design review alone can add a lot of value before construction even starts.