An air-supported sports dome holds itself up on pressurized air behind a thin membrane, so the envelope, the fan system, and condensation control are one interdependent problem rather than three.
An air-supported sports dome is unlike any conventional building: a thin membrane is held up entirely by slightly pressurized interior air, with no internal structure. That makes the envelope and the mechanical system a single interdependent system — the membrane and pressurization keep the dome standing; the thin membrane is prone to condensation; every entry has to seal to hold pressure; and insulation drives both comfort and condensation. It has to be designed as one integrated whole.
These behaviors are predictable, so the envelope can be engineered around them rather than treated as a generic enclosure. The sections below cover the four decisions — membrane and pressurization, condensation on the membrane, air-lock entry sealing, and insulation and thermal performance — that most determine whether an air-supported dome stays up, dry, and comfortable.
These challenges rarely stay in one silo: the same discipline runs through the same playbook behind composite manufacturing plant building envelope, and lessons from salt processing plant building envelope, and it all ladders up to ACE’s broader new-construction envelope design.
Membrane and pressurization are the defining reality, because the dome stands only because a fan system holds the interior at a slight positive pressure against the membrane. The envelope, the membrane, and that pressurization system are inseparable, and the whole enclosure has to be reasonably airtight for the pressure to hold with reasonable fan energy.
Any uncontrolled leakage bleeds the pressure the dome depends on, so sealing the membrane, its base, and every penetration is not an energy nicety here — it is what keeps the structure standing.
Because the membrane is the structure, its selection, seaming, and anchorage are envelope decisions with life-safety weight, and they must be coordinated with the pressurization design.
Representative of the failure locations ACE finds in air-supported and tensioned-membrane envelope work. Illustrative distribution, not a published statistic.
Condensation on the membrane is the defining moisture risk, because a thin single-layer membrane can reach the dew point on its interior face in cold weather, collecting condensation that drips onto the playing surface. Insulated or multi-layer membrane systems and interior conditions managed to keep the surface above dew point prevent that dripping.
The pressurization air itself carries the interior’s moisture to the membrane, so coordinating the humidity, the airflow, and the membrane’s thermal performance is central to keeping it dry.
Because the membrane is both the roof and the coldest large surface, its condensation behavior deserves as much attention as the structural pressurization.
An air-supported dome treated as a generic tent drips condensation, bleeds pressure at leaks and entries, and runs cold and uncomfortable.
Design it as one system: airtight membrane and base, dew-point control at the membrane, sealed air-lock entries, and insulated thermal performance.
The dome holds pressure, the membrane stays dry, entries hold the interior, and conditions stay comfortable.
Air-lock entry sealing is essential, because every time people or equipment enter, the dome would lose pressure without a way to move them through without opening the envelope to atmosphere. Revolving doors and air-lock vestibules let traffic in and out while holding the interior pressure.
Where entries leak or bypass the air lock, they bleed pressure and force the fans to work harder, and in cold weather they invite the infiltration that drives condensation, so the entry details are central to both stability and dryness.
Coordinating the entries with the pressurization and the membrane base keeps the dome holding pressure through normal, constant use.
Get the membrane, pressurization, and condensation strategy reviewed as one system before construction.
Schedule a consultationCall (866) 389-8883Insulation and thermal performance decide comfort, energy, and condensation, because a single-layer membrane has very little thermal resistance, so the dome gains and loses heat readily and its interior surface runs cold in winter. Insulated or multi-layer membrane assemblies raise both comfort and the surface temperature that keeps condensation away.
The thermal performance of the membrane and the humidity of the interior are linked, since a warmer interior membrane surface is less likely to reach the dew point, tying comfort and condensation control together.
The most valuable move overall is treating the dome as one integrated envelope — membrane, pressurization, entries, and thermal performance designed together — which is what keeps it standing, dry, and comfortable.
In ACE’s field work, most air-supported sports dome building envelope problems trace back to a few recurring locations — Membrane condensation & dripping, Pressure loss & air leakage, and Entry / air-lock bypass — rather than the open field of the wall or roof. The cost of resolving them climbs by roughly an order of magnitude at each stage: a detail corrected during design costs a fraction of the same fix during construction, which is itself far cheaper than a repair once the facility is operating. That economics is why we push envelope decisions as early in the project as possible.
Specify an airtight membrane and base, dew-point control at the membrane, sealed air-lock entries, and insulated thermal performance.
Confirm membrane seaming and anchorage, base sealing, and air-lock entry performance while accessible.
Verify the dome holds pressure and the membrane stays condensation-free before opening.
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