Metal Roof

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Why Choose Metal Roof?

Did you know that 12% of homeowners who replaced their shingle roofs in 2019 chose metal panels for their new roof instead of shingles? According to Dodge in 2020, that number jumped to more than 15%.

Why? With increasing frequency, homeowners realize that conventional shingles offer little real value. Shingles are often the cheapest alternative however it also fills up our landfills, is petroleum-based, and usually requires replacement in a short span of 12 to 15 years. In contrary, metal roofing is the perfect approach for homeowners who are tired of constantly replacing their shingle roofs and instead are looking for an environmentally friendly option.

The table below shows the cost comparisons between metal roofing and shingles:

Today’s metal roofs are available in various styles and colors to fit almost any design palette and building style. Panel styles run from exposed fastener to concealed fastener and vertical rib to tile shapes. Many manufacturers even offer a metal panel that looks like asphalt shingles. Consequently, as you start to explore the world of metal panels, it’s important to understand the options available.

Benefits of a Standing Seam Metal Roof
   50 to 60-year service life
   *Lower utility bills due to energy efficiency
   *Environmental friendly (recyclable)
   *High resistance to weather elements
   *Increased curb appeal

Typically, the first question is “How much is the cost?”. While it is generally accurate to state that metal roofing will cost more than shingles initially, as soon as shingles are replaced once (usually at 12 to 15 years), metal roofing actually becomes the more economical roof system. It’s all about the difference between first cost and life cycle costs.

Alpha Design Services’ goal is to make your next new roof your last roof! Our team will help you understand why metal roofing might make more sense for you than conventional shingles and provide our homeowners with the knowledge needed to make an informed decision.


Outside of cost, shingles offer few, if any, advantages for homeowners. Conversely, metal roofing provides a wide variety of benefits. Let’s explore a few of those in-depth:

#1 Long Service Life

When it comes to longevity and service life, it’s hard to beat metal roofing. A recent white paper published by the Metal Construction Association indicates metal roofs made from Galvalume® substrates could last 60 years or more. For context, it’s important to remember that’s two to three times what you can expect from most shingles.

#2 Reduced Utility Expenses: Cool Roof Pigments & ASV
Advanced Paint Technology made reflective pigments to metal coating possible. It reflects the sun’s energy which dissipates heat transfer along with Thermal Emmittance that releases absorbed heat.

Above Sheathing Ventilation (ASV) means adding a ventilated airspace between the metal roofing and the substrate below. While not discussed frequently, ASV is perhaps even more impactful than cool metal roof pigments. This airspace enables energy to move and vent into the atmosphere instead of absorbing into the building structure. Conversely, when the warm air remains in the structure, utility expenses are increase.

#3 Fire, Hail & Wind Resistance

Metal roofing also does a great job of standing toe-to-toe against Mother Nature. There are plenty of examples of metal roofing’s performance in adverse conditions. Many insurance companies recognize the benefits of metal and offer discounts for structures with metal roofs.

#4 High Recycled Content

Metal roofing also contains a high percentage of recycled materials, so today’s metal roof could have been a refrigerator or old automobile in its past life. When the service life of a metal roof ends (decades after installation!), the material is once again recycled.


Exposed Fastener vs. Concealed Fastener

The first significant differentiation for metal panels is their attachment method. Panels typically fall into two categories: exposed fastener or concealed fastener. As the name implies, screws pierce through the metal panel and into the substructure below for exposed fastener systems. Conversely, concealed fastener panels, attached with either clips under the panel or slotted fastening flanges and are attached with hidden fasteners. Exposed fastener systems install quicker and are consequently more economical.

Concealed Fastener Panel Styles

Concealed fastener panels are a bit different in the five distinguishing criteria. Most times, the on-center width of the major ribs is the same as the panel cover width. Concealed fastener panels also typically offer different pan conditions in between the two major ribs. Standard options range from flat to pencil ribs and striations. While the pan condition rarely affects the cost, some options like striations can greatly minimize oil canning, which is an important consideration.

Concealed fastener panels are also either symmetrical or asymmetrical in their design. Symmetrical panels are the same on both the left and right sides, whereas asymmetrical panels are different. It’s nearly impossible to tell the difference between the panel styles after installation unless you need to replace them. Symmetrical panels can easily be removed and replaced after installation. Conversely, asymmetrical panels can be difficult (if not impossible) to replace without tearing off panels back to the affected section. While repairs with metal roofing are rare, they can happen. Suppose a major storm hits your area, and a big tree limb falls onto your metal roof. If you chose a symmetrical panel system, it’s relatively simple to replace only the damaged panel. However, an asymmetrical system may require you to remove all the panels back to the impacted area.

The Drip Edge System is a two-part assembly that includes a continuous cleat and a decorative fascia cover for single-ply commercial roof systems. Our Drip Edge is available in pre-painted Kynar500®.

032″- .063″ formed aluminum and as 24 gauge Galvalume® steel. This product features both a 22 gauge and 24 gauge (LT) prepunched cleats with fasteners spaced at 12” on center. All products come in standard 10’ standard cleat and coping cover lengths. Concealed splice plates and fasteners are included with the purchase of this product.


The Metals Fascia HD System is a two-part assembly that includes a continuous cleat and a decorative fascia cover for single-ply commercial roof systems. Our Fascia HD is available in prepainted Kynar500® .040” formed aluminum as 24 gauge Galvalume steel. This product features a 18 gauge pre-punched cleat with fasteners spaced at 12” on center. All products come in standard 10’ standard cleat and coping cover lengths. Concealed splice plates and fasteners are included with the purchase of this product.


NC 550S Profile 1.5″ Snap Lock
A superior integral seam design and quick installation – that’s the hallmark of the DMC 550S panel. This expertly crafted interlocking roof system provides a powerfully protective weathertight seam. The finished results deliver a substantial measure of quality and style that’s certain to stand the test of time.

Substrates available:
Aluminum – .032

Available widths: 15″
New Castle design pressures, wind uplifts and test reports are for specific deck attachments, material gauges, clip spacing and panel widths.


Can be installed over open frame steel purlins, or over plywood decking and Drexel Metals MetShield® underlayment.

Finishes and product warranty:
Available in a variety of coatings and colors by Valspar.
Check the New Castle color card for standard colors and paint specifications.

Slope:Minimum slope 3:12

(35-Year Non Pro-rated PVDF Paint Warranty)


Drexlume® Substrate: Mill finished Galvalume® with a two-sided, clear acrylic finish.

Factory made or field rolled to exact lengths Optional: striation, beads, pencil ribs

  • UL 580 Wind Uplift (Class 90)

  • UL 2218 Class 4 Hail Impact

  • UL 263 Fire Certification

  • UL 790 Class A Fire Rating

  • UL Environmental – SRI Third-Party Verified


NC300HT is a high-tensile-strength rubberized asphalt underlayment specifically designed to withstand temperatures up to 250°F (121°C). Ideal for use under metal including copper, zinc and COR-TEN® (consult technical department for installation instructions),WIP300Ht can also be used under synthetic tiles and asphalt shingles. This strong, skid-resistant membrane is available in either black or white and provides superior protection from water penetration caused by wind-driven rain and ice dams.

NC300HT High Temperature Protection Self-Adhering Roofing Underlayment

Features and Benefits:

  • Protects the roof structure from water seepage caused by ice dams and wind-driven rains

  • Resists temperatures up to 250°F without degradation of the adhesive

  • Seals around roofing nails, staples and screws

  • Bonds directly to the roof substrate for fast and easy installation without the need for additional adhesives

  • Split-release film provides easier, faster installation

  • Resists cracking, drying and rotting, providing long-term waterproofing performance and low lifecycle cost

  • Concealed waterproofing system will not detract from the architectural aesthetics of the primary roofing system

  • Exposed rubberized asphalt bead along the membrane edge ensures watertightness of lap seams


NC300HT underlayment is applied when the roof deck is dry and the substrate temperature is 40° F (4.4°C) or higher. At temperatures below 40° F, nailing or priming should be used to temporarily hold the membrane in place while adhesion develops. NC300HT i s designed to be covered with the primary roofing system and should not be exposed to sunlight for more than 60 days. White underlayment offers exposure time of 120 days.

*Substrate must be free of any moisture. If moisture is present, it may inhibit adhesion.


  • NC300HT should be installed when air, roof deck and membrane temperatures are at or above 40°F (4.4°C).

  • NC300HT should not be left exposed to sunlight for more than 60 days for black membrane or 120 days for white membrane.

  • NC300HT membrane should not be folded over the roof edge unless protected by a gutter or other flashing materials.

  • The primary roof system must be ventilated to prevent excessive moisture build-up in the interior structure.

  • Use caution during the installation of the membrane as it may become slippery when wet or covered with frost.

  • NC300Ht must not to be used in contact with flexible PVC material.

  • Substrate must be free of any moisture. If moisture is present, it may inhibit adhesion.

  • Prepare the roof deck by removing all loose objects, dirt, dust and debris.

Metal Roof Underlayment
Under water-shedding metal roof systems or low-slope metal roofs with a minimum1⁄2″ slope, start at the low point and apply NC300HT over the full surface of the roof deck. Review the metal roofing manufacturer’s instructions for limitations and precautions. Beginning at the eaves, apply underlayment from the low point to the high point of the roof, running the roll horizontally.

Remove all old materials from the roof deck in the area to be covered with NC300HT underlayment. Replace water-damaged sheathing and sweep roof deck thoroughly.

Priming is not required on clean, dry wood or metal surfaces but concrete masonry, exterior gypsum board and polyisocyanurate insulation should be primed using the appropriate primer or adhesive. Adhesives such as CCW-702 and GAV-GRIP'”are appropriate and required when temperatures are below 40°F

Valleys, Hips & Ridges
Cut NC300HT roofing underlayment into manageable lengths. Align over the center of the valley, hip or ridge. Remove release film. Press the middle of the membrane first before working toward the edges. For open valleys, cover NC300HT roofing underlayment with metal valley liners.

Eaves & Rakes
Cut NC300HT underlayment into10-15′ pieces. Remove 2-3′ of release film and align the edge of the membrane, sticky side down, so it overhangs the drip edge by 3’8″ (10 mm). Continue to remove release film and press as you move across the roof. Use a hand roller and/or hand pressure to press into place. Overlap end laps a minimum of 6″. NC300HT roofing underlayment should reach a point 2′ inside the interior wall line. Local codes may require additional courses. If additional courses are required, the top lap must be at least 31⁄2″.

Drip Edges
At the rake edge, apply NC300HT underlayment first and place drip edge on top. At the eave, apply drip edge first and place NC300HT underlayment on top of the drip edge so that it overhangs drip edge by3/s” (10mm).

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