A metal roof is a lifetime investment because it can last 50 years and even more if it’s a good one. Asphalt roofing, on the other hand, lasts only about 30 years, depending on the way it’s installed and the quality of the shingles. However, there are some things that have to be considered before you decide to install metal roofing over your existing shingles. If you want to know more, read the following paragraphs, where you will find some information on the topic, provided by a roof installation service provider.
The Pros and Cons of Steel Roofing
If you want to install a steel roof over asphalt shingles, it’s best to use a steel shingle system instead of the more common standing seam steel, which is also more expensive. In a standing seam roof, single, long panels run vertically from the eave to the ridge, whereas steel shingles are small panels that are installed in horizontal rows, a lot like the other shingles.
Better quality steel shingle systems are installed over a framework of 2x2s. This framework has three main benefits. Firstly, because the interlocked shingles are screwed to the frame and the frame is screwed directly to the rafters, the roof can withstand winds of up to 120 mph without getting damaged. Secondly, the frame creates a straight and flat surface even when the shingles are badly curled.
Finally, the frame creates a ventilation gap which helps prevent ice dams during the winter and also cools the roof and the house in the hot months. To vent the roof, you have to cut some holes in the old roof, right above the soffit. This pulls air through the soffit vents underneath. Then, cool outside air travels under the shingles to the vented ridge and pulls out the heat and moisture.
Steel roofs can be really noisy and also unattractive in residential settings. But if the steel roof is installed over an asphalt roof, noise won’t be a problem. Also, if you choose a good looking one from all the options available on the market, your house won’t end up looking like a cattle barn. And even though steel roofs are expensive, they will last for many years. That’s why we think it’s worth it to invest in one.