How to remove the old roofing?
Although you can install corrugated metal roofing over shingles, for the best foundation it is recommended that all the old roofing be removed. Work at a slow and steady pace, not trying to rip-up or carry-off too much old roofing at once. Wikihow enumerated the steps of how to install a metal roof.
- Start from the highest, furthest point and take up all the old shingles, flashing, vents, and boots. You should be replacing all these with the new metal roofing.
- If you come across any large nails that are sticking out, either remove them and put them in your debris container or hammer them in deep so that they aren’t a danger to anyone working.
- If you need to reposition your gutters, do so at this point.
- Always remove the old roofing on a day (or set of days) when the weather is expected to be dry and sunny, as you don’t want any rain or moisture to seep into your building.
Tips for Installing Metal Roofing
Here are the tips for installing metal roofing according to Best Buy Metals
- Make sure the first panel is installed square – all the other panels will follow it.
- On exposed fastener panels: While you don’t have to predrill holes for your screws, predrilling panels will make it easier to get the screw lines straighter. – You can predrill a stack of about 10 panels at a time. – Make sure you measure for predrilling accurately.
- If you pop lines for your screws, make sure to use blue chalk, and NOT RED CHALK. Red chalk is very difficult to get off and can stay on for months, while blue chalk will usually wash off with the next rain.
- If you need to cut panels lengthwise, you can score them with a box cutter several times, and then bend it back and forth until it breaks off, producing a clean edge. You can also use tin snips or the TurboShear Drill Attachment for cutting them.
- Screw your fasteners in straight, and don’t overtighten them. The best way to do this is to set your drill tension, preferably testing it out on a scrap piece of metal or on an area that will be covered over by a ridge cap or other flashing.
- Wear protective rubber coated gloves while working with metal roofing and flashings. This not only protects you from the sharp metal edges, it also gives you a better grip on the metal roofing.
- After you finish installing the metal roofing, make sure to brush off any metal filings / shavings that are on the roof. Otherwise they will cause unsightly rust spots where they rest on the metal roofing.
Things you shouldn’t consider when installing metal roofs:
As metal roofs are not as prolific as asphalt, many myths have arisen about them. Here are a few, based on Home Advisor, as well as the truths behind them:
- “Metal roofs are noisy.” — This calls up the old image of a hard rain on a corrugated tin roof. The flexibility of the corrugated tin is what makes the roof respond like a cymbal. Metal roofs are rigid and often have a sound-deadening underlayment. Some homeowners have reported that their houses are actually quieter after having a metal roof installed!
- “You can’t walk on a metal roof.” — The idea behind this one is that the metal will buckle. Any roof will buckle if it doesn’t have good roof decking supporting it. Metal is as “walkable” as any roof.
- “Metal rusts.” — Yes, it does, if it’s exposed and doesn’t have a galvanized coating or some other form of protection. Metal roof installers should include this in the estimate.
- “Metal gets hot.” — Anything left in the sun gets hot, especially metal, asphalt, slate, or pretty much any other material used for roofing. Metal roofs can be coated with cooling colors that reflect solar heat and help keep your home comfortable. Also, metal sheds heat more efficiently than asphalt, resulting in an average 40% savings for cooling during the summer.
- “Metal makes your roof a lightning rod.” — No, height makes a lightning rod. A metal roof is no more prone to lightning strikes than an asphalt roof. There is a big difference, however; asphalt ignites. When lightning strikes something flammable, it can combust. Asphalt is petroleum based and can burst into flames. A metal roof can take the strike and may actually protect your home from lightning!
- “Metal is heavy.” — While any rock music fan may agree with you, metal roofs are actually lighter than asphalt by around 50%, and lighter than slate, concrete tile, and fiber cement shakes by about 75%