Slate Roof Installation

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Slate roof installation

Techniques for Durability and Value

Slate roofs are some of the nicest and longest lasting roofing options available to homeowners. While slate roofs can be pricier than other materials, they can last as long as 100-150 years, making it well worth the upfront cost

However, slate roofs are one of the most complicated roofing systems to install. And, if installed incorrectly, slate roofs will last only a couple years. That’s why you need to be careful when you’re selecting a roofing contractor for your synthetic slate or authentic slate roof.

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What You Need to Know

Here are a couple things your roofing contractor should know about slate roof installation:

Roof deck and underlayment
Headlap and aligning courses correctly
Valleys, ridges, and flashings
Choosing the installation materials
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Roof deck and underlayment
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Headlap and aligning courses correctly
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Valleys, ridges, and flashings
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Choosing the installation materials

Using the proper type of wood for the roof deck is key to a long-lasting synthetic slate or authentic slate roof installation. Ideally, you should only use 3/4- to 1 ½-inch thick rough or kiln-dried lumber board that will last for at least the next 150 years. Better yet, use a roof deck that will be good for the next 300 years. Never use plywood or particle board, as it will reduce the usable life of your slate roof.If slate is properly installed, it will be watertight on its own and does not require underlayment. As such, your roofing contractor should not rely on underlayment for water- or wind-proofing, but may use underlayment to cushion the slate during installation and as a surface on which to draw course—or slate row—lines.

A good way to determine whether a slate roof installation was performed correctly is to look at the ”headlap.” Slate roofs are installed in ”courses,” or rows. The bottom of one course should overlap the top of the slate two courses below by at least 3 inches, ideally, but never less than 2. Headlap is what keeps water from penetrating your synthetic slate or authentic slate roof. Depending on the pitch—or slope—of your roof, you might need more or less headlap. Low pitch roofs, for instance, need more headlap because water rolls more slowly off than it would on a steeper sloped roof.In order to achieve the correct amount of headlap, your roofing contractor will likely draw out all courses in red chalk on the underlayment. Measuring out courses beforehand ensures precision and accuracy throughout the whole slate roof installation process.

Simply ensuring the correct amount of headlap isn’t enough. For a completely waterproof slate roof, you’ll need to make sure all the seams are sealed. If you have a dormer on your roof, then your roofing contractor will need to install flashing around the edges. It’s the same for valleys—the low points of your roof—and ridges—the high points of your roof. There are many different options for flashings and ridgecaps. If, for instance, your roofing contractor is using copper flashings, they might use about 20 oz. copper for valleys and 16 oz. for ridges and flashings.

If you can, avoid ordering foreign slate boards. American standard slate boards come with indented nail holes, which allow the nail to be tight against the slate it’s securing without putting undue pressure against the overlapped boards. As far as materials are concerned, copper and stainless steel nails are typically the best for securing slate roofs.ASTM, a reputable third-party standards organization, has developed a series of tests by which they measure the quality and predicted durability of slate used for roofing applications. Their standard for slate—ASTM C406—categorizes slate into three categories: S1, S2 and S3. To ensure your roof lasts long into the future and to be sure of the weatherproofing qualities of your slate, make sure your contractor uses only S1 grade slate.

Roof deck and underlayment

Using the proper type of wood for the roof deck is key to a long-lasting synthetic slate or authentic slate roof installation. Ideally, you should only use 3/4- to 1 ½-inch thick rough or kiln-dried lumber board that will last for at least the next 150 years. Better yet, use a roof deck that will be good for the next 300 years. Never use plywood or particle board, as it will reduce the usable life of your slate roof.If slate is properly installed, it will be watertight on its own and does not require underlayment. As such, your roofing contractor should not rely on underlayment for water- or wind-proofing, but may use underlayment to cushion the slate during installation and as a surface on which to draw course—or slate row—lines.

Headlap and aligning courses correctly

A good way to determine whether a slate roof installation was performed correctly is to look at the ”headlap.” Slate roofs are installed in ”courses,” or rows. The bottom of one course should overlap the top of the slate two courses below by at least 3 inches, ideally, but never less than 2. Headlap is what keeps water from penetrating your synthetic slate or authentic slate roof. Depending on the pitch—or slope—of your roof, you might need more or less headlap. Low pitch roofs, for instance, need more headlap because water rolls more slowly off than it would on a steeper sloped roof.In order to achieve the correct amount of headlap, your roofing contractor will likely draw out all courses in red chalk on the underlayment. Measuring out courses beforehand ensures precision and accuracy throughout the whole slate roof installation process.

Valleys, ridges, and flashings

Simply ensuring the correct amount of headlap isn’t enough. For a completely waterproof slate roof, you’ll need to make sure all the seams are sealed. If you have a dormer on your roof, then your roofing contractor will need to install flashing around the edges. It’s the same for valleys—the low points of your roof—and ridges—the high points of your roof. There are many different options for flashings and ridgecaps. If, for instance, your roofing contractor is using copper flashings, they might use about 20 oz. copper for valleys and 16 oz. for ridges and flashings.

Choosing the installation materials

If you can, avoid ordering foreign slate boards. American standard slate boards come with indented nail holes, which allow the nail to be tight against the slate it’s securing without putting undue pressure against the overlapped boards. As far as materials are concerned, copper and stainless steel nails are typically the best for securing slate roofs.ASTM, a reputable third-party standards organization, has developed a series of tests by which they measure the quality and predicted durability of slate used for roofing applications. Their standard for slate—ASTM C406—categorizes slate into three categories: S1, S2 and S3. To ensure your roof lasts long into the future and to be sure of the weatherproofing qualities of your slate, make sure your contractor uses only S1 grade slate.

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Why You Should Schedule A Consultation With Wildwood

There is so much to consider when conducting a slate roof installation—that’s why you need to choose a roofing contractor that has experience with slate roofs. At Wildwood Roofing & Construction, we’ve been repairing, maintaining and installing slate roofs for years. We know a thing or two about slate roof installation—from what kind of nails are best to the best manufacturers for every price range. Plus, we use only S1 grade slate boards.

If you’re thinking about installing a slate roof, give us a call. We’ll talk you through your options and offer you a cost- and obligation-free estimate.

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What Our Customers Say

Wildwood did a great job in a timely manner. Roof looks amazing , thank you!!

Asian Chaq

Luke was very helpful from the very beginning until the end of the project. The crew did a great job protecting the landscaping and were thorough with their cleanup. I highly recommend Wildwood Roofing.

Naturescape Designs

Michael made the process easy and painless. Very professional.

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Fabulous to work with. Excellent workmanship and on time

Steve

The sometimes-dreadful thoughts one might have when needing a new roof, along with getting quotes, dealing with insurance adjusters and claims, and the inconvenience during construction, can be a daunting experience; however, this couldn’t have been further from what our experience was with our recent new roof and gutter replacement by Wildwood Roofing and Construction.We were referred to Elliot Emann of Wildwood Roofing and Construction when our home had hail damage. Elliot performed an assessment of our home and thoroughly went over the damages we had, as well as meeting with our insurance adjuster to go over the damages he found.With Elliot’s guidance and findings, the initial insurance claims process was quick and seamless. Within only a few weeks of filing our claim, construction was underway. The Wildwood Construction crews were polite, respectful of our property, worked diligently, and cleaned up all construction debris, finishing the project in an expeditious manner.From the initial damage assessment of our home through the final project closeout, we did not experience any sales pitch pressures or tactics from any of the staff with Wildwood Roofing and Construction. Elliot’s main focus was ensuring we were happy and satisfied with the process, schedule, and construction.Without reservation, I highly recommend Elliot Emann and the services of Wildwood Roofing and Construction.Rick Rohlfing

Rick Rohlfing

Dwight with Wildwood Roofing met with us and worked efficiently with our insurance company to have our roof replaced. He’s very easy to work with and the crew did a great job.

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