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The Metal Building Manufacturers Association’s (MBMA) guide explains how teams can prepare metal building systems for whole-building air leakage testing, with practical attention to seams, transitions, penetrations, and construction sequencing. Released in September 2023, Best Practices to Comply With Whole-Building Air Leakage Testing Requirements for Metal Building Systems is a free educational resource—not a guarantee that a project will pass. Its central lesson is that results depend on a continuous air barrier and coordinated work across trades, from early detailing through test-day repairs.
MBMA says it developed the guide with the Door & Access Systems Manufacturers Association and the North American Insulation Manufacturers Association. Z-Tech Consulting, LLC, prepared it for MBMA; Robert A. Zabcik, P.E., LEED AP, authored the guide, which is dated June 1, 2023. The association announced its release in September 2023. The Building Design + Construction report covered that release.
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The guide draws on field-testing experience to identify recurring areas that deserve close attention: interfaces between dissimilar materials, changes in the air-barrier configuration, and penetrations through the enclosure. It also lays out a project sequence—from preconstruction review to quality control and test preparation—that can help teams find and address gaps before finishes conceal them.
What does the guide recommend, and what does it not promise?
It recommends treating air-barrier continuity as a coordinated project responsibility, not as a task that belongs to one installer alone. It does not warrant that following the recommendations will make a building pass a particular test.
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The guide is a general educational aid. It says manufacturers and contractors should exercise independent judgment and comply with applicable building codes, laws, and regulations. Its illustrated details are useful starting points, not universal specifications: actual materials, substrates, geometry, and code requirements vary by project. The project’s design professionals and construction team must determine which details are suitable for its assembly.
That qualification matters because a whole-building test assesses the completed enclosure, while air leakage can arise at a small joint, a poorly prepared surface, or a trade penetration. A sound detail on a drawing can still fail to function if the substrate is dirty, the seal is interrupted, a later trade cuts through the barrier, or the work is concealed before inspection.
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Where does air-barrier continuity need the most attention?
Start with junctions where materials, planes, or responsibilities change. The guide highlights wall bases, doors and windows, wall-to-roof transitions, corners, canopy framing, and mechanical, electrical, and plumbing (MEP) penetrations.
- Dissimilar-material interfaces: A membrane or facing may meet concrete, metal trim, a door frame, or another material with different surface and movement characteristics. The connection needs a compatible, continuous seal.
- Configuration changes: The barrier may shift from an inboard to an outboard position or need to pass around a corner, opening, or canopy. These transitions should be drawn and coordinated rather than left to field improvisation.
- Penetrations: Ducts, pipes, conduit, structural elements, flange braces, and pipe hangers interrupt the enclosure. Numerous individually small details can add up; the guide notes that a large building may have 1,000 or more flange-brace and pipe-hanger penetrations.
That count is the guide’s example, not an industry-wide average. Its practical implication is to inventory penetrations early and assign responsibility for sealing them. A detail that works for one opening may not fit another, especially where movement, access, or the surrounding assembly differs.
What should the team do before construction begins?
Review the air-barrier details before materials arrive, identify the continuous-air-barrier components on the drawings, and make sure every affected trade understands the test and its responsibilities. The guide’s sequence begins with preconstruction detail review because many test-day problems originate in unclear ownership or incompatible details.
- Set the project goal and compliance strategy. The owner and design team should establish the relevant energy-performance goal and determine how the project will demonstrate compliance. Do not assume a threshold, exemption, or test requirement applies everywhere; verify the code adopted by the authority having jurisdiction and any local requirements.
- Coordinate the architect, engineer, and metal-building supplier. Review where the air barrier runs and how it connects at the foundation, wall, roof, openings, corners, and transitions. Resolve mixed inboard/outboard conditions in the details.
- Mark air-barrier components on the plans. Identify the materials that form the continuous barrier and show how they connect. The guide recommends getting the relevant details to the trades that will install or penetrate them.
- Assign work and repair responsibility. Identify who installs each seal, who checks it, who protects it from subsequent work, and who repairs damage. In particular, coordinate responsibility for sealing and repairing MEP penetrations.
- Select a testing agency and plan the test early. The test agency should be selected early enough for the team to coordinate logistics and understand the intended test target. Hold a preconstruction meeting and tell all trades that a whole-building test will occur.
- Plan access, inspection, and repairs. Decide when the air barrier will be inspected before concealment, where repair materials will be available, and who will perform or supervise repairs during testing.
Drawings should make the intended connection legible in the field. A note to “seal as required” is less useful than a detail that identifies the materials, overlap, attachment, and responsible trade. When a detail depends on a particular substrate or product compatibility, confirm that condition before installation rather than assuming a substitute will behave the same way.
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How should installation follow the guide’s sequence?
The guide moves from foundation and anchorage through framing and surface preparation, wall and roof air-barrier work, accessories, penetrations, and quality control. Following that order helps teams prepare the receiving surfaces and inspect work before later components make it difficult to reach.
1. Prepare the foundation and framing surfaces
Check the building-edge foundation surface where the wall-base seal will land. Rough concrete or exposed aggregate can make it difficult to achieve a reliable seal. The guide also calls out welded framing surfaces: weld splatter, grease, and dirt can interfere with tape adhesion. Clean and prepare these surfaces as required by the selected materials and project details.
Foam closures are generally not essential to the continuous air barrier, according to the guide, but it notes that their use has reduced leakage. That is not a reason to treat a closure as a substitute for the specified air-barrier connection; determine how the closure fits the actual assembly.
2. Build and check the wall-base connection
The guide’s wall-base illustrations show a continuous seal under the base angle, with additional sealant at butt joints where needed. They also show a low-profile fastener that does not perforate the insulation facing and a continuous line of air-barrier tape at the facing-to-base-trim interface.
Where trim itself forms part of the air barrier, the guide describes a 1-to-3-inch overlap with a line of tube or tape butyl sealant. Treat those dimensions as the guide’s detail guidance, not a default for every system. Confirm that the selected trim, sealant, substrate, and facing are compatible and that the installed connection remains continuous at joints and changes in plane.
3. Install wall-panel air-barrier details for the selected configuration
For sealed wall-panel systems, the guide describes centering tape over the panel rib, joining the tape ends, and ensuring fasteners engage the sealant. It says tape widths of ¾ to 1 inch often give better results than narrower versions. The appropriate tape and width still depend on the assembly and manufacturer instructions; the guide does not establish one product or dimension as suitable for every project.
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For an outboard air-barrier arrangement, protect the facing during panel installation. The guide describes insulation running 2 to 6 feet ahead of the panel in certain outboard installations, a sequence that requires attention to protecting exposed facing as work proceeds. For an inboard arrangement, continuity through the rigid frame and clean attachment surfaces are key considerations. Coordinate these details with the chosen system rather than combining instructions for different configurations.
4. Connect wall, roof, and corner details
At wall-to-roof transitions and corners, the essential task is connecting the wall and roof air barriers without a break. Mixed inboard/outboard conditions can be especially difficult to detail, so resolve them on drawings and review them with the affected installers before work reaches the transition.
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5. Coordinate openings as assemblies and interfaces
Where possible, the guide recommends metal-building-system-specific windows and personnel doors because they can simplify detailing. The opening still needs a continuous connection between its frame and the surrounding wall air barrier; specifying a compatible unit does not eliminate that interface.
Overhead doors warrant separate attention. The guide says these doors are tested as assemblies under the cited code and standards framework, but the adjacent jamb and header transitions still need coordination. Treating the door assembly as tested does not automatically address how the wall barrier connects to its framed opening. The guide identifies that surrounding transition as a common oversight. Confirm the project’s applicable requirements and the details for the specific opening.
6. Detail penetrations for fit, movement, and repair
A perfectly fitted hole around a duct can be difficult to make, and movement can open a gap after installation. The guide illustrates an approach using an oversized opening, metal trim secured through butyl tape, and open-cell foam or mineral-wool backfill. Smaller penetrations may be addressed with accessories from liner-system manufacturers.
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These examples do not make one repair detail appropriate for every penetration. Select a detail suited to the component, the air-barrier location, expected movement, and material compatibility. Make sure the responsible trade can reach the connection, install it without damaging adjacent work, and repair it if later work disturbs the seal.
How should the team prepare for the test?
Before test day, confirm that the test target and roles are understood, the enclosure has been inspected, and trained people and repair materials can be reached promptly. Testing is not the first time the team should look for an incomplete seal.
- Confirm the target and logistics. The project documents should identify tested components and the intended test target. Coordinate the agency, schedule, access, and any site-specific arrangements before the building is ready for testing.
- Inspect before concealment. Check visible air-barrier work before cover trims or finishes hide it. Inspect joints, transitions, openings, and penetrations while they remain accessible.
- Keep repair supplies available. Make the specified repair materials available on test day, including compatible tape, sealants, or other materials required by the project details.
- Have trained repair personnel available. The guide recommends having trained people on site or on call to respond to findings. A person who can identify the intended air-barrier detail is better positioned to make a suitable repair than someone asked to apply an unapproved patch under time pressure.
- Document and distribute findings. Record test findings and repairs, then share the information with the relevant project participants. That record helps the team close out the work and communicate lessons across similar details.
If the test reveals leakage, use the findings to locate and repair the specific discontinuity under the project’s approved approach. Do not infer from one finding that every similar assembly has the same defect, or that a quick patch is compatible with the materials. Document what was found, the repair, and any follow-up required by the testing agency or project team.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which code and testing requirements apply?
There is no single threshold or exemption that can be assumed for every metal building. Applicable requirements depend on the code adopted for the project, jurisdictional amendments, and project conditions, so confirm them with the authority having jurisdiction and the project’s design professionals.
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Before construction, put the relevant requirement and compliance strategy in project documents. Confirm which test method and target apply, what components are included, and what documentation the project must retain. A testing agency can help coordinate the testing process, but design and code questions should be resolved with the responsible professionals and local officials.
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What resources are included with the guide?
Beyond its installation recommendations, the guide includes a project checklist, overhead-door installation information, and appendices covering applicable codes, test methods, and material requirements. The checklist can help teams turn general coordination points into project-specific tasks, while the appendices provide context for the test and materials.
Use those resources alongside the drawings and specifications for the actual building. The guide’s value is in drawing attention to recurring weak points and sequencing decisions; it does not replace project-specific design, manufacturer instructions, code review, or the judgment of qualified construction professionals.
How should a project team use the guide?
Use it as a coordination and quality-control aid: review details before construction, identify continuous air-barrier materials and trade responsibilities, inspect accessible work before concealment, and prepare for repairs before the test. Focus first on interfaces, configuration changes, openings, and penetrations, then apply the same continuity check to the complete enclosure.
The guide’s release reflects a growing emphasis on whole-building air leakage testing in energy-code updates, as MBMA general manager Tony Bouquot noted in the association’s release announcement. For an individual project, however, the applicable obligation and target must come from the adopted code and project requirements—not from a general statement about code trends.
Frequently Asked Questions
Who published the metal-building air leakage guide?
MBMA commissioned the guide, which Z-Tech Consulting prepared and Robert A. Zabcik, P.E., LEED AP, authored. MBMA says the work was done in partnership with the Door & Access Systems Manufacturers Association and the North American Insulation Manufacturers Association.
Is the air leakage guide free to download?
Yes. MBMA provides the guide as a downloadable document at the linked publication page. It is intended as an educational resource for metal-building manufacturers and contractors.
Does following the guide guarantee a building will pass its air leakage test?
No. The guide expressly does not warrant that its recommendations will ensure a pass. The completed assembly, applicable test requirements, workmanship, and project-specific conditions all matter.
What materials does the guide discuss for air-barrier details?
Examples include air-barrier tape, butyl sealant or tape, flashing, foam, and closure materials. The appropriate choice depends on the assembly and material compatibility; the guide does not recommend a universal product for every project.
