A roof is far more than shingles—it’s a complete system where every layer works together to protect your home. At the foundation is the roof decking, a sturdy base that supports all other layers. Above it lies the underlayment, a moisture barrier that shields the deck from leaks if the top layer is damaged. Starter strips along the roof’s edge anchor the first shingles and prevent wind uplift, while the outer covering—whether shingles, metal, or tile—serves as both protection and curb appeal. Metal flashing then guards vulnerable joints around chimneys, vents, and valleys, keeping water out of key weak spots. At the peak, ridge caps seal and ventilate the roof’s top seam, preventing moisture intrusion. Proper attic ventilation ensures airflow that reduces heat and humidity, preserving your roof’s lifespan. Finally, insulation ties the system together, boosting energy efficiency and indoor comfort year-round. When each layer performs its role, your roof functions as a coordinated shield—strong, balanced, and built to last.
source: https://gobighorn.com/understanding-the-vital-role-each-roof-layer-plays/
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