Homeowner’s insurance will step in for damage caused by natural disasters, and the roof warranty will often take care of installation errors. The other 40% to 50% of total roof replacement costs go toward materials. An itemized list breaks down to the roofing material—shingles, shakes, tiles, etc—as well as the underlayment, new flashing, roof ridges and vents. Here's more info on customer.cntexnet.com look into the page.