How To Install Metal Roofing Over Existing Shingles

A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof. Your metal trim will go along the roof's edges as well as the top ridge.

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To tear off the shingles and replace with a new roof or to install a metal roofing system over the existing roof.

How to install metal roofing over existing shingles. This will help prevent water leakage and provide a buffer between the metal roof and the existing shingles. Briefly i want to install metal shingle roof over two layers of old aspalt shingles on my cottage. Use notching scissors to notch the metal in the middle so that it will bend over the ridge.

Now two main methods are used to install metal roofing on top of shingle roofing. This will provide ventilation while protecting your new roof from the abrasive shingles. How to install a metal roof over existing shingles.

The advantage of this is that it covers the old roof. The low weight of metal roofing is one thing that encourages this. The first is to apply an approved underlayment over the old shingles.

If you want to install steel over asphalt, your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common (and more expensive) standing seam steel. Methods of installing metal roofing on top of traditional shingle roof. Although it is fine that you know how to install metal roofing over asphalt shingles, metal roofing always requires more specialized skill sets, making a job best reserved for professionals.

The industry standard for underlayment is often thought of as felt paper (tar paper) but there are also many newer synthetic underlayments that are designed to work well with metal roofing. The purlins give the installer a flat surface to install the metal roofing. This method has its benefits as well.

This is because by installing the new roof over the old one, you can easily miss any damages, water spots, mold, or rot that may be underneath the old singles or materials,. Installing steel roofing over existing roofing materials is fairly simple. This is more expensive but will also be higher quality.

Roof slope is 3:12 and there is no attic. Verify codes in your area before installation. The second way is to install 14 purlins over the shingles.

In simple terms, if the asphalt shingles are not used to support the metal roof, then you can install a metal roof over the asphalt shingles. 1) remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof. You must put in a completely new underlayment over the existing shingles before you carry out any installation.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. There are two primary methods implemented when installing metal roofing over shingles. This is the fastest way to install but it doesnt provide the flattest surface for metal roofing installation.

The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. The first and perhaps the most common is to run a brand new underlayment on top of the shingle roof. Most buildings are designed to support the heaviest roofing systems.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. In a standing seam roof, long, single panels run vertically all the way from the eave to the ridge. Although the answer is technically no, you dont have to remove the old roof, bridger steels team never recommends installing a new metal roof directly over an old roof.

The weight of the roofing system. Steel shingles weigh about 1/4 what asphalt shingles weigh and aluminum shingles weigh about 1/8. Would it make sense to add foam insulation between old roof and new metal shingles to keep house cooler in a summer.

Though there are many ways to install a metal roof over shingles, we recommend this installation method, which provides the most durability over time. Both options have their benefits and drawbacks. On flat, even roofs, you can place the metal roofing directly on top.

This allows the new underlayment to act as a line of defense in the event that water somehow gets under the metal roof. How many layers of shingles are currently installed? Ventingthe eaves to vent the roof, holes are cut in the old roof above the soffit, which pulls air through the soffit vents underneath.

Steps to installing a metal roof over shingles. But not all metal roofing can be installed on battens, so you will need to check the roofing you choose to make sure it can be used this way. Its important to first inspect the plywood under the asphalt shingles to make sure it is in good condition.

Start with an underlayment over the existing shingles: However, the combined weight of asphalt shingles and metal roofing may require additional support in. Purlins can be used to provide space between the old roofing and the new metal roofing panels.

It will also give you a nice, flat surface to install your panels on. The metal roof must rely on the buildings framework for full support. The purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacturer has testing for their roofing panels, and then the metal is installed to the purlins.

Battens are wooden strips that you install over the old shingles, providing a more even surface for the metal roofing to sit on. Before you decide to install a metal roof over existing asphalt shingles you need to answer a number of important questions: The first is running new underlayment over an existing shingle roof, thus covering the old roof.

A layer of underlayment installed on top of the existing shingles will help keep the granules of the old shingles from rubbing against the back of the metal and causing possible corrosion. You can stall them on your old roof deck and screw your metal roofing panels to the purlins. Golden tips for installing metal roofing over shingles with an aging asphalt shingle roof, homeowners are usually left with two choices:

Do you have to remove shingles before installing a metal roof?

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