What you’re seeing here is a textbook example of why proper installation matters. This roofer created a makeshift “valley” by laying shingles straight through without cutting or sealing them—leaving every edge exposed. The result? Shingles that don’t adhere, joints that funnel water directly underneath, and a valley design you won’t find in any manufacturer specification. Shortcuts like these don’t just void warranties—they invite leaks, wind damage, and premature failure. Quality roofing starts

How to Cut and Install Starter Shingles | DoItYourself.com