Having said that, Should your roof is under 10 years old and weighty rain or wind moved a couple of shingles, you’ll likely get away with repairing it. Underlayment: A uniform layer of felt shields against water infiltration beneath the shingles, and allows the shingles to lay flatter. Info on https://local-metal-roofing-contr88776.bloginder.com/29516558/metal-roofers-an-overview