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Roofing
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Roofing Contents:
CSI NUMBERS
DEFINITION
CONSIDERATIONS
COMMERCIAL STATUS
IMPLEMENTATION ISSUES
GUIDELINES
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1) Fiber-Cement Composite Slates and Shakes
2) Organic Asphalt Shingles
3) Metal Roofing Products
RESOURCES
- PROFESSIONAL ASSISTANCE
COMPONENTS / MATERIALS / SYSTEMS
GENERAL ASSISTANCE
CSI Numbers
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07300 Shingles & Roofing Tile
07410 Preformed Roof Panels
07500 Membrane Roofing
07610 Sheet Metal Roofing
07620 Flashing & Trim
07316 Metal Shingles
07320 Roofing Tiles
07321 Clay Roofing Tiles
07322 Concrete Roofing Tiles
DEFINITION
This section deals with roof covering materials such as shingles, tile, and roof panels.
CONSIDERATIONS:
In selecting material for roof covering one should take into account its weight (heavier material requires larger support members), its durability (e.g. how well can it tolerate high and low temperatures and for how long), its effect on water falling on the roof if the water is being captured (for example, will gravel from shingles build up sediment in a cistern or do roof materials leach into the water?), the heat-holding qualities of the roof material (does it heat up and stay hot into the night?), as well as cost, fire rating, maintainability, and installation characteristics.Slate, clay, and cementitious roof materials offer excellent durability but are heavy. Fiber-cement composite roof materials are somewhat lighter and use fiber materials resourcefully. Some use waste paper as well as wood fiber. Many have 60 year warranties.
Metal roof materials, steel and aluminum contain high percentages of recycled content, up to 100% in many aluminum products. An additional advantage is that these materials are easily recycled in their post-use as well as lightweight and durable.
Asphalt shingles use recycled, mixed paper in their base and some use reclaimed minerals in the surface aggregate. This type of material does not last as long as the others mentioned above. Recycled plastic roof materials are starting to be introduced as a lightweight option.
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COMMERCIAL STATUS
TECHNOLOGY:
Well-developed; more recycled-content roofing materials can be anticipated.
SUPPLIERS:
Adequate; fiber-cement roof materials are not readily available.
IMPLEMENTATION ISSUES
FINANCING:
Available.
PUBLIC ACCEPTANCE:
Most people prefer shingle, tile, or slate roof materials; metal shingles are available as an option to metal sheet materials.
REGULATORY:
Roofing materials will meet standards established by the appropriate testing groups and must be installed according to the manufacturers instructions.
GUIDELINES
1.0 Fiber-cement composite slates and shakes
- Weigh between 325 and 500 pounds per square.
- Use standard roof structures.
- Long-lasting (up to 60-year warrantees, fireproof).
- Typically have Class A fire rating.
- Weigh between 325 and 500 pounds per square.
2.0 Organic asphalt shingles
- Up to 25% recycled content by some companies.
- Life of 20-30 years.
- Not easily recycled at end of useful life.
- Weigh approximately 230 pounds per square.
- Up to 25% recycled content by some companies.
3.0 Metal roofing products
- Can be made to give shingle appearance
- Most metal roofing, including standing-seam, contains recycled metal.
- Metal roofing used primarily for agricultural buildings is lower in cost, but requires premium metal coatings, factory-finished panels, or watertight construction detailing when used for housing.
- 3.1 Metal coatings
- Zinc (galvanized) coatings oxidize to protect the steel. Protection is lost when the oxidation process uses up the zinc, and the steel underneath can rust. On low-sloped roofs in wet climates, coating loss and rust can show up in five years.
- Aluminum coatings are superior to zinc, carrying warranties up to twenty years. They are inert, and do not degrade over time.
- Aluminum-zinc alloys, or Galvalume, will outperform aluminized coatings and exceed twenty-year warrantees.
- Zinc (galvanized) coatings oxidize to protect the steel. Protection is lost when the oxidation process uses up the zinc, and the steel underneath can rust. On low-sloped roofs in wet climates, coating loss and rust can show up in five years.
- 3.2 Paint
- Only use factory applied paint.
- Polyester resin finishes offer least durability. Fading will occur in 5 to 7 years.
- Silicone modified polyester finishes are superior (the more silicone, the better the performance). Twenty year warranties are available.
- Fluorpolymer resins provide a state of the art finish. Five paint companies produce this paint under the brand names of Duranar, Nubelar, Fluropon, Trinar, and Visulure.
- Bare aluminized or Galvalume panel can last 40 years without maintenance and is a better choice than polyester resin finishes.
- Only use factory applied paint.
- 3.3 Panel thermal movement
- Metal panels respond to temperature change by expanding and contracting. This causes the fastener hole size to increase, resulting in leaks.
- Dark colors will experience the largest thermal movement.
- Panels installed over purlins will not harm the roof system with thermal movement.
- If installing over a solid deck, use Z-shaped metal sleepers over the decking. The sleepers will move with the panels and eliminate fatigue where the screws penetrate the panels (the screw hole will become elongated causing leaks) or the screws will lose grip on the decking. If possible, do not use solid decking with metal roof panels.
- Solid aluminum panels have a higher coefficient of expansion than steel and will strain fasteners with the increased movement from temperature change.
- Metal panels respond to temperature change by expanding and contracting. This causes the fastener hole size to increase, resulting in leaks.
- 3.4 Galvanic reactions
- Protect metal panels on the anodic end of the galvanic scale from fasteners and flashings on the cathodic end to prevent corrosion.
- Protect metal panels on the anodic end of the galvanic scale from fasteners and flashings on the cathodic end to prevent corrosion.
RESOURCES
PROFESSIONAL ASSISTANCE
See "Building Construction Consultants" and ""Roofing Services Consultants" in Yellow Pages.
COMPONENTS / MATERIALS / SYSTEMS
See "Roofing Contractors", "Roofing Equipment and Supplies", and "Roofing Materials" in Yellow Pages.- American Cem-Wood Products
P. O. Box C
Albany, OR 97321
(800) 367-3471
www.cemwood.com
"Cascade and Royal Shakes(TM)" and "Pacific Slate(TM)" fiber -cement roofing tiles, 30 year warranty, 480-620 pounds per square, Class A fire rating.CertainTeed Corporation
3303 E. 4th Ave.
Shakopie, MN 55379
(800) 328-5874, (800) 274-8530
Organic felt based shingles with recycled-content, Class C fire rating.Classic Products
299 Staunton St., P. O. Box 701
Piqua, OH 45356
(513) 773-9840
Rustic Shingle recycled aluminum shingles, 40 year limited warranty, 45 pounds per square, Class A, B, or C ratings according to underlayment, enamel acrylic paint finish approved for drinking water catchment.Eternit
Excelsior Industrial Park, P. O. Box 679
Blandon, PA 19510-0679
(215) 926-0100
Fiber-cement slates, average 430 pounds per square, Class A rating, 30 year non-prorated warranty.Gerard Roofing Technologies, Inc.
955 Columbia Street
P. O. Box 9459
Brea, CA 92622-9459
PH: (800)-23-ROOFS (714)-529-0407
FX: (714)-276-1476
http://www.gerardusa.com
info@gerardusa.com
Steel (G-90 Galvanized or AZ-50 Gavalume) Tile & Shake roof panels coated with graded stone granules & accessories, 140 pounds per square, Class A rating, 50 year warranty.James Hardie Building Products
26300 La Alameda Suite 400
Mission Viejo, CA 92691
(800) 426-4051
www.jameshardie.com
Hardishake(R) & Hardishingle(R) fiber cement tiles, 380 lbs per square, Class A rating, 50 year warranty.Masonite Corporation
1 South Wacker Drive
Chicago, IL 60606
(800) 255-0785
Woodruf(R) shingles from reconstituted wood fibers, 230 pounds per square, 25 year limited warranty, simulate natural cedar appearance.Maxitile, Inc.
17141 S.Kingview Ave.
Carson, CA 90746
(800) 845-6293
Fiber-cement tile, 340 pounds per square, Class A rating, 50 year warranty, simulate mission tile appearance.Metal Sales Manufacturing Corp.
3838 North General Bruce Drive
Temple, TX 76501
(800) 543-4415
Stile(TM) metal tile, 100 pounds per square, Class A rating, 20 year limited warranty, Simulate clay tile appearance.Nailite International
1251 Northwest 165th St.
Miami, FL 33169
(800) 624-5483
Recycled-content plastic panels, 80 pounds per square, Class C rating.D'Hanis Brick and Tile Co.
311 E. Nacoma
San Antonio, TX 78216-2714
(800) 299-9399
Clay tileElgin-Butler Brick
1009 E. 40th St.
Austin, TX 78751
(512) 453-7366
Clay tileVail Metal Systems
P.O.Box 6521
Vail, CO 81658
(888) VAILMETL,
www.vailmetal.com/roofing/
copper and Kynar 500 galvalume panelsGAF
1361 Alps Rd
Wayne, NJ 07040
(800) 223-1948
Fiber-cement shingles, slates, shakes, 240-500 pounds per square, Class A and B ratings, 40 year non-prorated warrantyMetalWorks
1005 Beaver Grade Road
Moon Township, PA 15108-2944
(800) 320-0101
Aston Wood Steel shingles, 63 pounds per square, 5 Kynar 500 colors available, Simulate wood shake appearance
Local Distributor:
Pan Am Distributing, (512) 836-1531
ATAS International
6612 Snowdrift Road
Allentown, PA 18106
(800) 468-1441 or
4559 Federal Blvd.
San Diego, CA 92113
(800) 879-8382
www.atas.com
Steel and Aluminum shingles, 35-60 lbs. per sq. for aluminum, 80-140 lbs per sq. for steel, Class A rating, 25 yr. warranty ,the look of shake, slate, or tile, (4) Kynar 500 colors
Local Dealer:
Pan Am Distributing, (512) 836-1531Perfect Choice Building Products
1618 Lynch Rd.
Evansville, IN 47711
(800) 776-8060
interlocking thermoplastic shingles with cedar shake appearance, Class A flame protection, 62 lbs per squareRe-New Wood, Inc.
P.O.Box 1093
Wagoner, OK 74467
(800) 420-7576
Eco-Shake(TM) 100% recycled plastic/wood shingle, 250 lbs/sq, 50 yr warranty, 4 colors , Class A fire rating
Local Distributor:
Polston Sales & Marketing
(972) 258-6255
Cal-Shake Corporation
5355 N. Vincent Ave.
Irwindale, CA 91706
(818) 969-7544
fiber-cement shake-like and slate-like roofing tiles, 25 year warranty
Vincent Metal Goods
P.O.Box 360
Minneapolis, MN 55440
(800) 328-7800
"ColorKlad" and "AlumaKlad" standing seam metal roofing panels
Protective Coatings of Austin
2210 S. 1st St., Suite G1
Austin, TX 78704
(512) 462-1094
reflective,insulating, ceramic roof coating
GENERAL ASSISTANCE
- Metal Roofs
RR2, Box 146
Richmond, VT 05477
Send stamped self addressed envelope for
detailed information on metal panels
installation.National Tile Roofing Manufacturing Assn.
3127 Los Feliz Blvd.
Los Angeles, CA 90039
(213) 660 4411Underwriters Laboratory
333 Pfingsten Road
Northbrook, IL 60062
Standards for fire ratingsAmerican Society for Testing and Materials
1916 Race St.
Philadelphia, PA 19103
(610) 832-9500
Standards for aluminum, slate, asphalt, steel- Can be made to give shingle appearance
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Sustainable Building Sourcebook web version copyright Sustainable Sources 1994-1999.