Modular Metal Shingle Roof Systems
- MODULAR METAL ROOF SHINGLE SYSTEM - CONTENTS: Coated Modular Metal Shingle Roof systems. Installation guide for modular metal shingle roofing. Flashings and Accessories for modular shingle metal roofs. Characteristics of metal roofing materials
- Best practices for roofing material installation, flashing, ventilation, nailing, underlayment
- POST a QUESTION or READ FAQs about metal shingle roof systems
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This article explains the selection, use, and properties of modular metal roof shingle systems, including granular-surfaced metal roof shingles and snap-together metal roof shingles. We include a photo guide to types of metal roof shingles including antique metal shingles.
This article series discusses best practices in the selection and installation of residential roofing. This article includes excerpts or adaptations from Best Practices Guide to Residential Construction, by Steven Bliss, courtesy of Wiley & Sons.
More photos of metal shingle roofs are at Metal Shingle Roofs. Also see our metal roofing home page, METAL ROOFING and see CORRUGATED ROOFING and COPPER ROOFING, our roofing home page: ROOFING INSPECTION & REPAIR.
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Modular Metal Roof Shingles: Best Roofing Practices & Installation Details
The metal roof shingles at below-right found on a New York home are steel, coated with a granular material that from the ground can be mistaken for asphalt. Carson Dunlop's metal roof shingle sketch (below left) provides additional details about this roofing option.
[Click to enlarge any image]
Adapted/paraphrased with permission from Best Practices Guide to Residential Construction, chapter on BEST ROOFING PRACTICES:
Modular metal shingles comprise the fastest growing segment
of the metal roofing industry. Using light-gauge steel,
copper, or aluminum, panels are stamped to imitate slates,
shakes, asphalt shingles, or tiles. Some have aggregate
stone finishes that closely resemble asphalt shingles. Most
carry warranties from 20 to 30 years against fading and
from 50-year to “lifetime” warranties against cracking or
delamination of the shingle itself.
Modular shingles carry a Class A or B fire rating,
depending on the material and installation details, and are
highly resistant to wind uplift and damage from hail. Installed
prices range from two to three times the cost of premium asphalt
shingles. Installers accustomed to asphalt shingles or
tile should have little trouble adjusting to metal shingles.
Materials Used in Modular Metal Roof Shingle Systems
Modular shingles are typically stamped from
lightweight .0165-inch metal, which is thinner than other
types of metal roofing but stiffened by the textured patterns.
Typical rectangular panel sizes range from 24 to 48
inches long by 12 to 16 inches wide, but they also include
tile and diamond shapes and other specialty patterns.
The roof shown in our photo (left) was installed in Molde, Norway, an area of challenging winter weather. Here is another Molde, Norway modular shingle metal roof showing a different shingle pattern.
Weights for modular metal shingle roofs range from 40 pounds per square for aluminum
shingles to 140 pounds per square for steel shingles with a
heavy stone aggregate.
The lightweight patterns are well suited
to re roofing where weight is a concern. Most panels
can be walked on, if done with care, but areas with heavy
foot traffic should be reinforced with foam backers provided
by the manufacturer.
Installation Methods for Modular Metal Roof Shingle Systems
Modular shingles are either nailed directly
to the wood deck or attached to 2x2-inch battens installed
at the exposed panel width, usually about 15 inches.
Installation on battens allows more deeply etched patterns,
such as simulated tiles. Either type can be installed with
Our photograph at left illustrates a variegated colour modular metal shingle roof installed on a home in Christchurch, New Zealand. Metal roofs are the most common roof covering on residential buildings in Christchurch.
In earthquake prone areas such as Christchurch, metal roofing movement noise may be heard as a roaring freight train sound indicating the approach of a shock wave, perhaps giving an extra minute's notice of earthquake warning.
See EARTHQUAKE DAMAGE PHOTOS
Underlayment for modular or "snap together" metal shingle roofs is minimum No. 30 asphalt felt held
with plastic caps to avoid contact between incompatible
Many manufacturers recommend proprietary
laminated underlayments, such as VersaShield (Elk Premium
Building Products, Inc.), which are tougher and less
slippery than felt and provide better fire ratings. Aluminum
shingles require fire-resistant underlayments to achieve an
A or B fire rating.
Direct to Deck Modular Roof Shingle Attachment Method
Direct to deck Modular Metal Roof Shingle Method: Shingle panels installed directly to the
deck are attached with concealed nails, either through
clips or a nailing flange along the top, and have interlocking
edges along all four sides (Figure 2-43 shown at left).
they are installed, each panel locks to the panel below
and to the left.
Installing Modular Metal Roof Shingle Over battens
Modular Metal Roof Shingle Over battens: Modular panels designed for installation
on battens have a nailing flange along the bottom of
each shingle panel with nails going horizontally into
the batten (Figure 2-44).
Roof battens are useful for modular metal roof shingle retrofits
where the surface is irregular. Also, the air space
boosts energy savings, especially when using shingles
with solar-reflective surfaces.
Both systems begin with the installation of a drip edge
and gable trim designed for the specific system.
from left to right, the first shingle panel hooks into the drip
edge, which also serves as a starter strip.
courses for modular metal shingles are staggered as specified by the manufacturer.
Re roofing Using Modular Shingles On Top of Other Roof Coverings
As we discuss at METAL ROOFING, the rusted metal shingles on the church roof (Clintondale, NY) shown in our photo (left) demonstrate more about the history of how metal roofing was used in the U.S. Here the original wood shingle roof was re-roofed using metal shingles, probably before 1900.
In general, most modular shingles can be installed
over existing asphalt shingles [or wood or some other surfaces] if they are in good
condition without excessive curling and deformation.
Metal modular roof shingles that are designed to go over battens (see above) have more flexibility,
since the battens can be shimmed to create a level surface.
Flashing and Sealing Details for Modular Metal Roof Shingles
[Click to enlarge any image]
Manufacturers provide standard
flashings similar to those for standing-seam products.
Eaves and rake flashings typically have concealed fasteners
and lock the shingles in place.
Ridge and headwall
flashings often require exposed fasteners.
the shingle profile, sidewall, chimney, and skylight flashings
are either pan or step flashings.
Typical flashing and sealing details for metal modular roof shingles are
shown at above left in Figure 2-45.
-- Adapted with permission from Best Practices Guide to Residential Construction.
Other Antique Modular or Snap-Together Metal Shingle Roofing Systems
As we discuss at METAL ROOFING, here are photographs of other modular metal roof shingle systems.
Metal Shingle Roofs, Embossed, Antique
The antique embossed metal shingles (below) are found on the Justin Morrill Smith historic homestead, Vermont.
Quoting Grapefine Design Guidelines:
Metal roofing in America is principally a
19th-century phenomenon. Before then the
only metals commonly used were lead and
Tin-plate iron, commonly called "tin
roofing," was used extensively in Canada in
the 18th century, but was not commonly used
in the United States until rolling mills were
established in this country. The low cost, light
weight, low maintenance and ease of shipping
of tin plate made it a common roofing
Embossed tin shingles, whose
Grapevine Design Guidelines – Roof Design Guidelines 4.9 - 2
surfaces created interesting patterns, were
popular throughout the country in the late 19th
century. Tin roofs were often kept well-painted
in red or green to imitate the green patina of
copper. Unfortunately, few of these roofs
remain intact today.
Similar snap-together metal roof shingles made of copper are discussed at COPPER ROOFING.
Soldered Flat Shingle and Flat Copper Metal Roofs
Flat metal shingles with interlocking edges were produced in both steel and copper, then soldered when in place. Usually we find these installed on flat or low-slope roofs such as at dormer insets on homes constructed in the U.S. before 1920.
Carson Dunlop's standing seam metal roof sketch (below) includes a sketch of soldering used to connect flat metal roofing panels.
Watch out: large expanses of metal roofing with soldered connections may flex and break open the soldered joints due to thermal movement.
Resources: Roofing Materials & Equipment Suppliers
- Classic Products
Modular metal shingle panels and standing seam panels
- Decra Roofing Systems
Modular metal shingle, tile, and shake panels
- Dura-Lok Roofing Systems
Modular metal roofing shingles with granular coating
Exposed fastener and concealed clip metal roofing
- Gerard Roofing Technologies
Modular metal shake and tile panels with granular
Modular metal roof-tile panels
- Atas International
Modular metal shingle, tile, and standing-seam panels
- Custom-Bilt Metals
Modular metal shakes and standing seam panels
- Zappone Manufacturing, website www.zappone.com/
Zappone Manufacturing, 2928 North Pittsburg St. Spokane, WA 99207
1-800-285-2677, Washington State Copper Roofing Supplier of
Copper scallop shingles, copper shingles, copper bay windows, vertical walls, aluminum roof shingles
-- Adapted with permission from Best Practices Guide to Residential Construction.
Continue reading at LIFE EXPECTANCY of METAL ROOFS or select a topic from the More Reading links shown below.
Or see SNOW GUARDS on METAL ROOFS
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MODULAR METAL ROOF SHINGLE SYSTEM at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
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Technical Reviewers & References
Publisher's Google+ Page by Daniel Friedman
Click to Show or Hide Citations & References
- Architectural elements: the technological revolution: Galvanized iron roof plates and corrugated sheets; cast iron facades, columns, door and window caps, ... (American historical catalog collection), Diana S Waite, available used out of Amazon.
- "Choosing Roofing," Jefferson Kolle, January 1995, No. 92, Fine Homebuilding, Taunton Press, 63 S. Main St., PO Box 5506, Newton CT 06470 - 800-888-8286 - see http://www.taunton.com/FineHomebuilding/ for the magazine's website and for subscription information.
-  Follansbee Roofing, Follansbee WV 26037, Tel: 800-624-6906, website: www.follansbeeroofing.com and http://www.follansbeeroofing.com/products/TerneII.aspx Quoting Follansbee on TerneII properties:
Follansbee Steel is the only manufacturer of a pre-painted or natural Terne roof and is a leading supplier of metal roofs for new and retrofit commercial, institutional, residential and historic preservation projects.
Terne II - Classic Terne-Coated Steel
... is a new and improved version of historic Terne metal, ... Terne II has improved capability for resisting corrosion in all environments ... also has excellent formability, solderability, and affinity for paint ... without compromising mechanical characteristics. It can be used in flatlock, standing seam, vertical wall designs and virtually any other application in which original Terne has been used. It is strong and ductile, having high yield and tensile strengths as well as workability. This new material can easily be formed with conventional roofing tools.
With Terne II roofing, it is advisable to paint the material as soon as conditions permit. Oxide formation is slower than with the original Terne and the wait for proper painting conditions provides substantially less risk. The new material is coated with Follansbee's new ZT® alloy, a combination of zinc and tin. This coating is designed not only as a barrier but also to be anodic to the steel substrate and reduce the potential for oxidation before painting.
The traditional oil-based paints long required on original Terne are not recommended for application on Terne II. Follansbee's Rapidri paint with its faster drying time and ease of application is much superior to the old painting system. The Rapidri acrylic paints are aesthetically pleasing while offering enhanced durability and color retention. ...
- Metal Roofing Alliance, E. 4142 Hwy 302, Belfair, WA 98528, Telephone:(360) 275-6164, Customer Support 410-534-6900, Email: email@example.com,
Website: www.metalroofing.com. Quoting:
The Metal Roofing Alliance was formed in 1998 by a small group of forward-thinking metal roofing manufacturers with the main goal of educating consumers about the many benefits of metal roofing. Since our inception, we've shown millions of people just how beautiful, durable and money-saving metal roofing can be for them. Over the years, our membership has grown to include paint companies, material suppliers, industry publications and more. Be sure to take advantage of all of the great resources our members offer.
- The Metal Initiative, 4700 W. Lake Ave., Glenview, IL 60025, P:847.375.4785 Website: www.themetalinitiative.com/, Email: Louise Ristau firstname.lastname@example.org Quoting:
The Metal Initiative is a coalition of manufacturers, individuals and associations that have come together to provide information on the features and benefits of metal in construction. Carrying its message of metal primarily to the professional building owner community, The Metal Initiative seeks to gather and disseminate useful information for decision-makers.
- Metal Roofing, an Illustrated Guide, R.A. Knowlton , [metal shingle roofs],
- Copper Roofing, by CDA
- Copper Roofing, Master specifications for copper roofing and sheet metal work in building construction: Institutional, commercial, industrial, I.E. Anderson, 1961 (hard to find)
- Corrugated Iron, Building on the Frontier, Simon Holloway
- Problems in Roofing Design, B. Harrison McCampbell, Butterworth Heineman, 1991 ISBN 0-7506-9162-X (available used)
- Grapevine Design Guidelines - Web Search 07/12/2010
- "Copy on file as - /roof/Asbestos-to-Zinc_Metal_Roofing_NPS.pdf - From Asbestos to Zinc, Roofing for Historic buildings, Metals - ", Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
- "Copy on file as - /roof/Asbestos-to-Zinc_Metal_Roofing_NPS_3.pdf - From Asbestos to Zinc, Roofing for Historic buildings, Metals-part II, Coated Ferrous Metals: Iron, Lead, Zinc, Tin, Terne, Galvanized, Enameled Roofs - ", Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
- "On file as /roof/Asbestos-to-Zinc_Metal_Roofing_NPS_2.pdf - From Asbestos to Zinc, Roofing for Historic buildings, Metals- Roofing Today - ", Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
- "Copy on file as - /roof/Roofing_Historic_NPS.pdf">Roofing for Historic buildings - ", Sarah M. Sweetser, Preservation Brief 4, Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
- "Copy on file as - /exterior/NPS_Preserv_Brief_16_Subs_Mtls.pdf">The Use of Substitute Materials on Historic Building Exteriors - ",
Sharon C. Park, AIA, Preservation Brief 16, Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
- ARMA - Asphalt Roofing Manufacturer's Association - http://www.asphaltroofing.org/
750 National Press Building, 529 14th Street, NW, Washington, DC 20045, Tel: 202 / 207-0917
- "Metal Roofing: 'Fixing' for Thermal Movement [ copy on file as /roof/Metal_Roof_Movement_NRCA.pdf ] - ", Thomas L. Smith, AIA, CRC., Professional Roofing, [date pending] p. 72, NRCA
- "Metal Roof Systems: Design Considerations for Snow and Ice [ copy on file as /roof/Metal_Roof_Snow_Ice_NRCA.pdf ] - ", Thomas L. Smith, AIA, CRC., Professional Roofing, [date pending] p. 74, NRCA
- "Steel [Roof] Decks: Issues for the 1990's [ copy on file as /roof/ Steel_Roof_Deck_Corrosion1_NRCA.pdf ] - ", Thomas L. Smith, AIA, CRC., Professional Roofing, [date pending] p. 74, NRCA
- "Steel [Roof] Deck Corrosion Bulletin, NRCA [ copy on file as /roof/Steel_Roof_Deck_Corrosion_NRCA.pdf ] - ", Thomas L. Smith, AIA, CRC., Professional Roofing, [date pending] p. 58, NRCA
- "The Many Aspects of Metal [Roof] Shingles [copy on file as Metal_shingles_NRCA.pdf ] - ", Thomas L. Smith, AIA, CRC., Professional Roofing, [date pending] NRCA
- NRCA - National Roofing Contractors Association - http://www.nrca.net/, 10255 W. Higgins Road, Suite 600,
Rosemont, IL 60018-5607, Tel: (847) 299-9070
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
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