08/21/2026
🔍 NEW CONSTRUCTION DOESN’T ALWAYS MEAN EVERYTHING WAS DONE RIGHT!
During a recent inspection, we found something that was simply forgotten during construction — an air admittance valve (AAV) was never installed.
So what does that little valve actually do? 🤔
An air admittance valve allows air into the plumbing drain system when water is flowing down the drain. That air helps equalize pressure so wastewater can drain properly without creating a vacuum that can siphon water out of the plumbing traps.
Why does that matter?
The water sitting inside the P-trap under your sink creates a barrier that helps keep sewer gases and odors from entering your home. Without proper venting, you can experience:
🔧 Slow or poorly draining fixtures
🔧 Gurgling or bubbling drains
🔧 Water being siphoned from the trap
🔧 Sewer odors entering the home
The fix may be relatively simple — but someone has to catch it first.
This is exactly why we recommend having a home inspection on new construction. A brand-new house is still built by people, and things can be overlooked.
🏠 New doesn’t mean perfect. Inspect it before you accept it.