Which sealing method uses an air seal with epoxy at the junction of the dome and base of the vault?

• A. Double Seal
• B. Dome
• C. Fiberglass
• D. Doeskin

Answer: (A)

Sealing at the junction of the dome and base of the vault relies on a combination that creates a tight, durable barrier. The double seal method uses an air seal together with epoxy applied at that junction. The epoxy fills micro-gaps and forms a strong bond, while the air seal helps prevent leakage by maintaining a controlled barrier against air movement. This dual approach is especially suited to the dome-base junction, where any gaps could let moisture or air escape and threaten the vault’s integrity. Other methods don’t pair an epoxy joint with an air seal at that specific junction, or they rely on materials or approaches that don’t provide the same level of joint stability and leak prevention.