Shifting onto aprons flashed, these are placed around tiles connected horizontally covering gaps between adjoining surfaces e.g chimney/wall junction then valley flashers come into action acting like little channels forming troughs funneled down towards gutters catching rainwater runoff right before flowing away fully even though phase flashes give vertical address https://raymondrpmhc.jiliblog.com/79853892/fire-resistant-roofing-materials-for-dummies