Protecting an Outdoor P-Trap from Freezing (DIY Insulated Box)

My house was originally a summer home, meaning the P-trap under my shower drain runs through an unheated outdoor space — a freezing nightmare in New England winters. In this video, I build a custom insulated foam board box around the P-trap and use multiple temperature sensors to find out if it actually works. What I cover: Why an outdoor P-trap is at risk of freezing Building a foam board insulation box from scratch Using a contour gauge to trace irregular pipe shapes Installing YoLink temperature sensors inside and outside the box Using a borescope + probe sensor to measure actual water temperature inside the P-trap One month of real temperature data showing the results The result? Even on 8°F nights, the water in the P-trap stayed above 40°F. No frozen pipes. 00:00 Intro and preparation 02:47 Building the Box 08:42 Temperature Results 11:03 Monthly Data Gear: 1. Saker Contour Gauge https://a.co/d/0ccA1Zz2 Great for measuring irregular shapes. 2. YoLink Temp Sensor https://a.co/d/07eYsh1w The hub is required, but if you already own the hub you can also buy the sensor on it’s own. 3. YoLink Temp Sensor with probe https://a.co/d/04SK443p Being able to measure the actual water temperature was a game changer. 4. Cheap coveralls https://a.co/d/07eYsh1w 5. Spray Foam Insulation https://a.co/d/00n9ocbJ 6. Teslong Boroscope https://a.co/d/00n9ocbJ