![]() Note: Metal Roofs get an even longer life expectancy when they are coated with high-quality paint and re-coated every 10 years or so. ![]() This practice is convenient and profitable for the installers but a huge inconvenience for the homeowner when their roof leaks after 10 years! It’s simply easier and faster to ‘screw down’ the panels in the low areas because no pre-drilling is needed. So why are so many roofers fastening the panels in the flat/low areas? The answer is upsetting. ![]() Why are so many Fasten-down Metal Roofs Installed Incorrectly? I looked through several installation guides for these products and discovered that the best practice is installing the screws at the high points just like Francisco claimed. The metal roofing panels were ALWAYS fastened through the high points, not the troughs. This was also consistent with my experience living in Central America where metal roofs are the most common roofing type. Francisco said that if the panels are fastened at the crimps instead of the flat areas homeowners can expect an extra 10-20 years of life expectancy. The crimps are at the high points of the panels so if there is corrosion around the screws over time, it is unlikely that water will get under the panels (see diagram below). Francisco’s crew pre-drills holes into the crimps of the panels. Matt was about to give up on the Exposed Fastener roof when he spoke with a local Asheville Roofing Contractor named Francisco who said that the Exposed Fastener Metal Roof was his favorite option for the money but it had to be installed correctly. What is the best way to install a Fasten-down Metal roof? Some of the roofing contractors my neighbor spoke with refused to install them because of callbacks. The critics of this roof say that during the freeze/thaw cycle the metal panels move and corrode around the screws where the water can enter and this is something that we often see in our inspections. This is also called a “fasten down” roof because the screws are fastened right through the metal panels into the roof sheathing. Matt kept thinking about the Exposed Fastener Metal Roof (Option #3). See the Advantages and Disadvantages of Fasten-Down Metal Roofs here See the Advantages and Disadvantages of Standing Seam Metal Roofs here See the Advantages and Disadvantages of Asphalt Roofs here In our area my neighbor Matt received several estimates and considered 3 different options: The costs of roofing materials depend on material costs (which fluctuate) and regional availability. (Regarding costs: Due to many economic factors that we’ve been experiencing the costs of these materials can fluctuate widely but hopefully, the information below will be helpful as far as their relative costs) Which is cheaper? Metal or asphalt roofs? Why are so many Fasten Down Metal Roofs installed incorrectly?Īdvantages and Disadvantages of Common Roof Types What is the Best Way to Fasten Down a Metal Roof? ![]() Which is cheaper? Metal or Asphalt Roofs? He preferred the look of a metal roof and wanted to harvest the rainwater with a catchment system (metal roofs are better for rain catchment systems because they don’t shed ballast, asphalt, and fiberglass fibers into the water tanks like asphalt shingles). ![]() My neighbor Matt has a classic bungalow in Historic West Asheville and last Summer he was looking to replace his asphalt shingle roof. ![]()
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