05/12/2026
A blower door test is how you prove the air barrier is actually doing its job—not just hope it is.
The most important time to test is while the building envelope is still accessible. At this stage, leaks can be identified, repaired, and improved before finishes cover everything up. Once drywall goes on, many of those opportunities are gone for good.
Getting below 1 ACH50 isn’t just about chasing a number. It directly impacts the health, comfort, efficiency, and long-term durability of the home.
A tighter envelope means:• Less uncontrolled humidity moving through walls and ceilings• Better indoor air quality with filtered, controlled fresh air instead of random air leakage• More even temperatures room to room• Fewer drafts and hot or cold spots• Reduced risk of condensation, mold, and moisture damage inside assemblies• Lower energy use without sacrificing comfort
Anyone can say a home is “tight.”A blower door test gives real data to prove it—and gives you the chance to improve it while it still can be improved.
You only get one shot to build the shell right.Don’t guess. Test, verify, and refine.