Roof sagging is usually a symptom of a roof deck structural dilemma. You’ll will need to get rid of and exchange the roof area to fix it. Comparable to aluminum, chrome steel shingles are dearer than asphalt but mid-range for metal alternatives. According to our data, Here's the common roof https://learntomore.com/5-contractors-recommended-in-hinsdale-il-top-experts-for-your-project/