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Frequently Asked Questions


How does it work?

Aeroseal Envelope is an interior applied air sealing system that seals building envelope leaks up to 1/2″. The waterborne sealant is aerosolized and injected into a pressurized home. The sealant is self-guided to the edges of visible and invisible leaks to create a seal by accumulating across the leak surface. The sealant is applied within 60-90 minutes and dries quickly, before system cleanup is complete. This ensures construction can resume shortly after the process is complete with little to no impact on standard construction schedules. The Aeroseal Envelope system measures envelope leakage in real-time, enabling the system to dial-in specific air leakage requirements with precision and guarantee the results.

How is leakage measured?

The Aeroseal Envelope system uses a modified blower door to measure envelope leakage during the process. The blower door is calibrated to meet ASTM Standard E779, E1554, CGSB-149.10-M86, EN 13829, ATTMA Technical Standard 1, NFPA 2001, RESNET and USACE.

What is a modified blower door?

Aeroseal Envelope modifies its blower door by adding a heater onto the fan. This allows the system to achieve optimal room temperature and humidity during the sealing process, allowing more sealant to be sprayed into the space for a faster, more efficient sealing process.

What size leaks will this seal?

Aeroseal Envelope seals holes as large as 1/2”, and as tiny as a human hair. Aerosol sealing is extremely effective at sealing narrow gaps and extremely small holes that are typically not cost-effective to seal manually, or that are missed using manual sealing techniques.

Is your formula really safe?

Our formula is a water-soluble organic compound and is proven safe. The sealant is ultra-low VOC and because it is inert there is no chemical reaction needed to form a seal meaning there is no off-gassing. With more than 150,000 projects sealed to date, we’ve helped hospitals, surgery centers, schools, and public buildings make sure their air is clean, healthy and comfortable – and saved them energy and money in the process.

In fact, our sealant is GreenGuard Gold Certified, meeting the stricter certification requirements used in schools and healthcare facilities.

How large of a space (square footage) can this be used?

Aeroseal Envelope has been used in apartments as small as 500 sq ft and in homes over 10,000 sq ft. As long as the space can be pressurized, it can typically be sealed. Additional blower doors can be added to increase the pressure in larger spaces.

How tight can Aeroseal Envelope actually seal a home?

Aeroseal Envelope has sealed houses to as low as 0.19 ACH50. But the value is in the system’s ability to allow builders to seal a home to as tight as it is designed for. Aeroseal Envelope can meet any IECC, Passive House, LEED, Well Standard, ENERY STAR or Net Zero requirement.

I heard too tight of a home is actually a bad thing.

A home that is too tight can be a bad thing if the space isn’t designed for that level of tightness. The popular saying “build tight, ventilate right” applies here and works both ways. Building tight without proper ventilation could cause issues with indoor air quality (IAQ) in the space. On the flip side, a leaky home with proper ventilation could cause the mechanical system to not work as it is designed. Because Aeroseal Envelope can dial in the desired tightness of the space it removes the guesswork and ensures that the home is only as tight as the space is designed for.

What's in the actual material being sprayed?

The Aeroseal Envelope sealant is based on a waterborne acrylic that has been used as a fluid-applied permeable air barrier for many years. The sealant is GREENGUARD Gold certified and has been tested according to various ASTM standards and NFPA 285 for fire spread, smoke production, adhesion, antifungal properties and tensile strength. The sealant is ultra-low VOC and has no off-gassing.

At what stage of construction can Aeroseal Envelope be applied?

Aeroseal Envelope may be applied at any time between rough-in and prior to occupancy. Although, the ideal time to apply Aeroseal Envelope is rough-in or post-drywall. Other factors that affect install is the build process (i.e. vented or unvented attics) and the site’s climate zone.

What surfaces need to be protected?

If Aeroseal Envelope is applied at rough-in or right after drywall is installed, there is very minimal preparation required. Vertical surfaces like walls, doors and windows require no covering. All designed openings, such as ducts, electrical and plumbing, need to be covered prior to sealing. All finished horizontal surfaces need to be covered.

What happens if any of the sealant were to accidentally get on something?

Aeroseal Envelope can be cleaned off surfaces. We recommend using a standard citrus based cleaner as soon as possible.

How long does it take to apply?

The entire Aeroseal Envelope process, from setup to completion, takes approximately four-hours for a typical single-family home. When targeting reduced envelope leakage levels of Passive House or ZERH, additional time may be required.

How many workers does a typical Aeroseal Envelope job require?

The Aeroseal Envelope system is typically run with a two-person crew. One is responsible for monitoring and setting up the computer and Aeroseal Envelope system, while the other support with seal preparation, cleanup and other tasks throughout the seal.

Is it safe to breathe during application?

No. During application, if a technician has to enter the space while it is being sealed, they wear personal protective equipment (PPE). After the sealing is complete, the area is safe to enter without protective gear within 20 to 30 minutes.

How long after the sealing process can work resume in the space?

The area needs to be aired out for 30 minutes after the sealing is complete. This is done by opening doors and windows while running the fan. During this time, the sealing equipment and coverings are removed.

What is the lifecycle of the product, or how long does the tight seal last?

Third-party lab testing reveals Aeroseal Envelope withstands a simulated 50-year durability test, with little or no seal degradation. Click here to see the durability test results.

Can Aeroseal Envelope be used as a vapor barrier?

No, the Aeroseal Envelope sealant is considered vapor open, allowing water vapor to pass through the sealant. Aeroseal Envelope is not a primary air or vapor barrier.

Can Aeroseal Envelope air sealing be performed in cold weather?

The Aeroseal Envelope process requires temperature control and pressurizing the areas to be sealed. The ideal condition is an outdoor temperature of ≥ 40˚F. Sealing can be done below 40˚F but may require additional steps for site preparation.

Where is Aeroseal Envelope available?

Aeroseal Envelope is available in most cities throughout North America. We are actively expanding our Dealer network.

How much does Aeroseal Envelope cost?

Cost depends on the construction phase and targeted air tightness levels. Once we have your job specifications, we provide a written quote within 24 hours. 

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Contact HomeAirSeal in Vero Beach, Florida by Calling (772) 774-4814.