The short answer is yes, you’re able to roof over your old asphalt roof with a new metal roof under the right circumstances. Your current asphalt roof has to be near the end of its lifespan and still lying down pretty flat (no lifted or cracked shingles, blisters, or bumps).
Can you put standing seam metal over shingles?
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 happens if you put a metal roof over shingles?
It’s absolutely fine to install a metal roof over shingles. People are accustomed to thinking of metal roofs as being heavy or cumbersome. In fact, metal roofs are so beneficial because they’re very light. They’re fast to install, and they come in large sheets rather than individual tiles.
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.
Can you install standing seam roof over shingles Related Questions
What are the pros and cons of putting metal roof over shingles?
A big reason people install metal roofs is because they are mildew and rot-resistant. But if moisture can get between your metal roof and your existing asphalt shingles, that great benefit is non-existent. Moisture between your roofing materials will still lead to mold, mildew and rot.
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.
Can you put a metal roof 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.
Can you connect a metal roof to a shingle roof?
Yes, you can do a metal roof and asphalt shingle roof combination. In most cases, this is done by adding metal roofing to certain areas of your asphalt roof.
How many layers of shingles can you put metal over?
One to two shingle layers can rest safely and securely under a metal roof. Any more than two layers could reduce the stability of your roof. Many building safety codes will not allow more than two layers, so check your local areas before making an installation.
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.
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.
How much does labor cost to install a metal roof over shingles?
Metal roofing cost an average of $13,200 to install on a 1,700-square-foot roof. It is important to note that more than two-thirds of the price often goes toward materials alone. You’ll pay anywhere from $1 to $25 per square foot for metal roofing materials plus another $2 to $14 per square foot for labor.
What not to do when installing a metal roof?
Incorrect Measurements. Choosing The Incorrect Metal Roofing Panel. Installing Fasteners Incorrectly. Oil Canning. Underlayment. Incorrect Sealant. Improperly Attaching Flashing. No Experience Installing A Metal Roof.
Is underlayment necessary for metal roof?
Yes, metal roofing absolutely needs underlayment. Felt and synthetic underlayment are great options for asphalt roof systems.
Which is easier to install metal roof for shingles?
Shingles typically have a lower price because they are easier to install. Metal roofs, on the other hand, take more specialized knowledge to install, and the material itself is more expensive.
Does a metal roof devalue a house?
Metal roofs are often touted as a good way to boost home value, but research indicates they are not as cost-effective as laminate shingles. The Remodeling Report for 2019 found that a metal roof, on average, cost homeowners $38,600 and increased home value by 60.9 percent.
How do you vent a metal roof over shingles?
To vent the roof, holes are cut in the old roof (Detail 1) above the soffit, which pulls air through the soffit vents underneath. Cool outside air then travels under the shingles to the vented ridge (Detail 2), pulling out moisture and heat.
Is it cheaper to put a metal roof on or asphalt shingles?
Metal roofing generally costs a bit more per square foot than asphalt shingle alternatives, sometimes by a magnitude of two or three. Metal roofing typically costs between $8 and $16 per square foot, according to estimates taken from early spring of 2021.
Do metal roofs need plywood underneath?
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 .
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.