Stop Rotten Fascia & Soffit Boards Before It Starts
One of the most common service calls I get as a roofing professional involves rotten fascia or soffit boards.
The sad reality? This problem is completely preventable. The International Residential Building Code (IRC) requires the installation of a metal flashing called a drip edge at the time of roof installation — and when properly installed, it eliminates this issue entirely.
Understanding Why Water Travels the Way It Does
Think about what happens when you pour water out of a jar. Some of it clings to the side and trickles down instead of falling cleanly. That’s because of two key fluid dynamics principles: adhesion and cohesion.
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Adhesion is a liquid’s tendency to stick to other surfaces.
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Cohesion is a liquid’s tendency to stick to itself.
Every water molecule experiences both forces, which means some water will always try to cling to your roof edge or gutter, especially when rain is light or the angle is shallow.
What Is a Drip Edge and Why It Matters
A drip edge is a simple piece of aluminum flashing installed around the entire perimeter of your roof. It has a sharp, rigid bend that kicks rainwater away from the fascia and into the gutter, exactly where it belongs.
Without drip edge, water adheres to the edge of your roof, runs behind the gutter, and seeps into the fascia or soffit — eventually leading to wood rot, mold, and costly repairs.
When properly installed, drip edge:
✅ Prevents water from trickling behind the gutter
✅ Directs runoff safely into the gutter system
✅ Protects fascia, soffit, and roof decking from rot
✅ Extends the lifespan of your roofing system
In short: Never install a roof without drip edge. This one small detail can save you thousands of dollars down the line.
Why So Many Roofs Don’t Have Drip Edge
Unfortunately, the construction industry often becomes a race to the bottom on price. The average home needs about $800 worth of drip edge — a minor cost compared to full roof replacement, but enough for some contractors to cut corners.
Many roofing bids omit drip edge entirely to appear cheaper, even though doing so violates building code. In Chattanooga, submitting a bid that fails to meet or exceed code requirements is technically a misdemeanor.
That’s why homeowner education is critical. Before signing any roofing contract, make sure your bid includes drip edge installation and complies with local building codes.
Protect Your Home Before It’s Too Late
If your fascia or soffit shows signs of rot — or you’re unsure whether your roof includes proper flashing — schedule an inspection before small leaks turn into major repairs.
A properly installed drip edge is one of the simplest and most effective defenses against water damage. Don’t let a missing piece of metal cost you thousands.