By JORDAN ELRICK

In modern construction, airtightness plays a critical role in building performance.

It is a key factor in managing energy use, ensuring occupant comfort and protecting the durability of the structure. Whether you’re developing a high-performance home or delivering a commercial facility with long-term operational demands, understanding airtight construction is essential.

What is Airtight Construction?
Airtight construction involves precisely sealing the building envelope to limit uncontrolled air infiltration and exfiltration. The goal is to manage airflow – not eliminate it – in a way that enhances thermal performance, reduces energy loss, mitigates moisture risks and improves indoor environmental quality.

Effective airtightness is typically achieved through:

• Continuous, uninterrupted air barrier systems
• High-specification tapes, membranes and sealants
• Detailed coordination at all junctions, penetrations and interfaces

Performance is often validated through testing, such as blower door tests measuring air changes per hour at 50 Pascals (ACH50).

Why Airtightness Matters More Than You Think

In many builds, visual finishes often take precedence – but the performance of a structure is shaped by what’s behind the surface. Airtight construction offers long-term, measurable benefits:

• Thermal performance: Minimized air leakage leads to reduced HVAC loads, consistent indoor temperatures and lower operational costs.
• Moisture management: Proper air control prevents humid interior air from reaching cold surfaces within wall assemblies, reducing the risk of interstitial condensation and mold.
• Indoor air quality: When integrated with mechanical ventilation with heat recovery (MVHR), airtightness enables filtered, balanced air delivery – without relying on uncontrolled infiltration.
• Durability and resilience: Airtight construction protects structural materials from premature degradation, safeguarding long-term asset value.

Our Airtightness Approach
Our methodology includes:

• Defining air barrier strategies in pre-construction
• Coordinating airtightness sequencing with ventilation systems
• Training subcontractors and supervising execution
• Verifying performance through onsite testing

We’re not chasing certification for its own sake. We’re focused on real-world outcomes that improve comfort, reduce operational costs and support long-term value.

Airtightness isn’t just a technical consideration. It’s a smarter, more robust way to build.

Jordan Elrick is a director/registered builder at Sanus Build.