05/25/2026
The Danger of "Through-Holes": Why Exterior Penetrations Need a Seal
Take a walk around your home's exterior today. Look closely at where your AC lines, flexible conduits, internet cables, or outdoor pipes enter your house. Are there gaps around them?
In the home maintenance, these are "through-holes," and leaving them unsealed is an open invitation for trouble.
Even a gap as small as a dime is enough for mice, spiders, and stinging insects to find their way inside your walls. Beyond pests, unsealed holes allow conditioned air to escape, driving up your energy bills. Over time, wind-driven rain can seep into these gaps, quietly causing hidden wood rot and mold.
How to fix it right:
❌ Don't just spray standard expanding foam. It degrades quickly in UV light, and pests can chew right through it. They do make pest block foam which can be used. Just make sure to seal outside face with silicone.
✅ Use high-quality exterior silicone sealant, pest-resistant backing rods, or specialized escutcheon plates to ensure a long-lasting, weather-tight barrier.
Make sure to check the ones that were sealed in the past. It doesn't take log for the silicone to shrink, crack, and degrade.
Catching these small vulnerabilities before they turn into expensive emergencies is exactly what we do. If you notice gaps or daylight around your exterior utilities, let’s get them sealed up properly.
🔗 Visit 45phm.com to schedule a comprehensive Preventative Home Assessment today!