Aeroseal / AeroBarrier — Pressurised Envelope Air-Sealing

Design Solution · HVAC & Energy

Design Solution · Dream about it

Pressurised aerosol envelope sealing system for air infiltration in buildings.

Aeroseal pressurises a building and injects a waterborne acrylic aerosol into the air stream to seal uncontrolled air leaks up to 5/8 inch. It addresses envelope air infiltration, which accounts for 25–40% of heating/cooling energy loss in typical buildings. Results are verified by blower-door testing post-deployment.

AeroBarrier pressurises a building and fogs a waterborne acrylic aerosol through it; the sealant deposits precisely where air is escaping, closing leaks up to 5/8 inch in cavities and junctions no trade can reach — with a blower-door test before and after putting a verified number on the result. That measured-outcome quality is rare in envelope work and is why 250,000+ buildings and national builders like Beazer have adopted it, mostly in new residential where the building is empty at the right construction stage. The target is worth the attention: infiltration accounts for 25–40% of heating and cooling loss in typical stock. The boundaries: the building must be vacated and prepped, which mostly rules out occupied retrofits; it seals what exists at application and does nothing for leakage that later develops through settlement or thermal cycling; and larger defects still need conventional remediation. Long-term adhesion under thermal cycling and the aerosol's interaction with ducts and cavities over decades are the open questions, and occupant-exposure protocols during application deserve scrutiny. Strongest as a scheduled step in new-build airtightness compliance; weakest as a fix for an occupied, leaky existing building.

Strengths

• Seals inaccessible leaks without demolition or interior disruption — reaches cavities, rim joints, penetrations standard methods cannot
• Quantified outcome: blower-door verified results enable proof of compliance for zero-energy and net-zero standards
• Rapid deployment: 250,000+ buildings globally; national adoption by major builders (Beazer Homes) demonstrates scalability
• Addresses a material energy vector: 25–40% of heating/cooling loss in typical stock buildings

Considerations

• Requires building to be empty and sealed during application; not suitable for occupied retrofit without relocation (moderate)
• One-time deployment — does not address ongoing air leakage from foundation settlement, thermal cycling, or age-related envelope degradation (moderate)
• Limited to gaps ≤5/8 inch; larger cracks, poor-fit windows, and structural voids require pre-treatment or complementary sealing (moderate)
• Introduces aerosol distribution into building systems (ducts, cavities) — long-term interaction with insulation, electrical, and mechanical systems not fully documented (moderate)

Risks

• Aerosol distribution uniformity across large or complex building envelopes may be inconsistent, affecting sealing effectiveness (moderate)
• Long-term durability and adhesion of waterborne acrylic sealant in thermal cycling and UV-exposed conditions not fully characterized (moderate)
• Occupant exposure to aerosolised particles during pressurisation; health and safety protocols require validation (moderate)
• Limited retrofit deployment data on existing buildings with varied envelope conditions (low)
• High equipment and labour costs may limit uptake in price-sensitive residential markets (moderate)

Performance

• Heating/cooling energy loss reduction: 25–40%
• Maximum air leak sealing capacity: 5/8 inch
• Verification method: Blower-door testing

Reality check

Strong corroboration: 250k+ buildings, major homebuilder adoption, credible venture backing (Breakthrough Energy, Climate Investment), published EPD, and peer-reviewed DOE research on airtightness impact. Blower-door verification removes subjectivity versus manual sealing. Energy reduction claims (~30%) align with DOE infiltration baseline (25–40% loss). No evidence of safety incidents or regulatory barriers in sourced materials. Limitation: source URL confirms funding fact only; full technical durability and failure-mode data not independently audited in provided excerpt.

#air_sealing #envelope_performance #energy_efficiency #blower_door_verified #retrofit #new_construction

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