The answer is, YES! One big advantage to metal roofing is that it is light weight, which makes it the perfect material to be installed over an existing shingle roof.
What is the best way to put a metal roof over a shingle roof?
The first is to apply an approved underlayment over the old shingles. This is the fastest way to install but it doesn’t provide the flattest surface for metal roofing installation. The second way is to install 1√ó4 purlins over the shingles. This is more expensive but will also be higher quality.
Do you have to remove shingles before installing a metal roof?
Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. While shingle removal is the preferred route, tear-off is messy and raises the cost of the job. A potential problem with this type of installation is trapped water vapor.
What is the problem with installing a metal roof over shingles?
There’s no chance to replace bad roof decking. The weight of the metal and the shingles. Crucial roofing components can’t be replaced. Future leaks are harder to track and repair. You’re covering up an old roof with problems that don’t go away.
Can you install metal roofing over existing shingles Related Questions
What is the best underlayment for metal roof?
30# felt underlayment (or two layers of 15# felt) are recommended for metal roof panels. Felt is an all-over roofing accessory made of a natural (wood cellulose, natural fibers, etc.) or synthetic (polyester or fiberglass) base that is then saturated in asphalt to make it water-resistant.
Can you put steel over 2 layers of shingles?
Many metal roofing systems can be installed over 1-2 layers of existing asphalt shingles, saving time, labor, and landfill costs.
How long does metal roof over shingles last?
Metal roofs offer many benefits, including: Longevity. Metal roofs can last 40-70 years, depending on the material. Traditional asphalt roofing materials have an estimated life expectancy of roughly 12-20 years.
What do you put down before a metal roof?
The three main types of underlayment for metal roofs include felt, synthetic sheet, and self-adhering membrane. Without an underlayment, the roof and rest of the home are exposed to the elements, which include not only wind and moisture but also chemicals and resin.
What goes on roof before metal roof?
Roof underlayment is typically placed beneath all external roofing materials, and is attached directly to the roof decking or sheathing. Three common types of underlayment for metal roofs include felt, self-adhering membrane, and synthetic sheet.
Do you need to put anything under a metal roof?
Yes, metal roofing absolutely needs underlayment. Felt and synthetic underlayment are great options for asphalt roof systems.
Can I install a metal roof myself?
While most metal roofing styles can be installed as an advanced DIY project, metal roofing installation is complicated and can vary slightly based on the brand of panels or shingles that you select. We recommend that you install a metal roof with one or two helpers and fall protection equipment designed for roof work.
Can you put metal roof over shingles without furring strips?
It is not recommended to install metal roofing over shingles without furring strips. The thermal expansion and contraction of the metal will rub against the shingle granules and the metal will corrode from the underside. The gaps introduced by furring strips also allow air venting which can reduce moisture.
What fails on a metal roof?
Failed sealant or butyl tape – Sealants and butyl tape are used to seal out water, dirt, and other debris that could compromise a metal roof. If these are damaged, missing, or applied incorrectly, leaks could occur.
What is the advantage of a metal roof over shingles?
Metal roofs are far more durable than shingle roofs. They last 40-70 years on average and have longer warranties of about 30-40 years. They stand up to extreme weather, hail and falling objects well. The materials used in your metal roof will impact its durability though.
Why is a metal roof better than a shingle roof?
Metal roofing is durable and routinely lasts 2-4 times longer than shingles. Homeowners like the idea of buying only one more roof in their life instead of potentially several. Metal roofing outperforms shingles in cases of hail and other severe weather events.
Do I need to put plywood under a metal roof?
Some might choose to skip using underlayment to save money. However, the metal roof underlayment acts as an added layer of protection. You can save money by using underlayment because it will help you avoid problems that would need to be fixed. The short answer is yes, your metal roof does need underlayment .
Do you need foam under metal roof?
Does a metal roof need insulation? Yes, it is highly recommended to use insulation with your metal roof. Insulation helps improve your home’s energy efficiency, keeping you warm during the winter and cool during the summer.
Do you need a barrier under metal roof?
As you walk up to a jobsite and see metal roofing installed, you may wonder, “Is a radiant barrier necessary with a metal roof?” The answer is yes. Radiant barriers are a great option for homeowners who want energy efficiency as a top benefit/factor.
How far apart should steel roofing be?
The trim and roofing sheet should be fastened every 12 to 24 inches along the gable edge. The metal roofing panels shown in this manual require a mini- mum slope of 2½” per foot to ensure proper drainage.
Do you need purlins for metal roof?
When it comes to roofing, metal purlins are a critical element needed to give the structure proper support. Though we do not do installations ourselves, Western States Metal Roofing has been providing contractors with the materials required for a successful installation for over two decades.