When designing or implementing your system be sure to follow the principles for cistern systems described in Rainwater Harvesting for Drylands, Volume 1

Metal Roofing

Be sure roofing is at least 26 gauge, since lighter gauges can dent. Baked on enamel, galvanized, and galvalume steel roofs all work with water harvesting systems.

• www.metalroofing.com
Lists contractors, distributors, and manufacturers across the country

• Mueller, Inc.
Lap style corrugated, U Panel, R Panel, and AP panel metal roofing www.MuellerInc.com

• ASC Building Products
www.ascbp.com

In Tucson, AZ
• MasterCraft Metals, Inc.
Standing Seam Roofing 1-800-607-7468
Tucson, Arizona (520) 792-2418
Silver City, New Mexico (505) 388-8800
www.mastercraftmetals.com

• Roof Ops Roof Options
Corrugated, Galvanized, Rusted, R Panel, Metal Tile, Metal Shingle
2734 E. Grant Road 318-4364

• Allied Building Products
3502 E. 34th St. 795-7663

Elastomeric Paint Approved For Potable Rainwater Catchment Systems

The following have been tested and certified by the National Sanitation Foundation International (NSF) as an approved potable water catchment coating that complies with the requirements of NSF Protocol 151 “Health Effects from Rainwater Catchment System Components” (www.nsfconsumer.org/environment/rainwater.asp):

•Weather Barrier Rain Coat 2000 is an acrylic roof coating that can be applied over an existing roof of less-desirable materials such as asphalt shingles. Due to its light color it is also effective in passively cooling buildings (see Sidebar 18.6). Weather Barrier 2000 Rain Coat is manufactured by Finnaren & Haley Inc., 901 Washington St., Conshohocken, PA 19428. 1-800-843-9800. www.weatherbarrier.com/wb2000.html

• Topcoat W. O. B. White (without biocide) is a water-based liquid that can be applied with a brush, roll or spray mechanism. It cures to form a seamless rubber membrane that covers the entire roof. Topcoat W. O. B. White (without biocide) is manufactured by Topcoat, Inc. a subsidiary of GAF Materials, Inc., 24 Industrial Road, Walpole, MA 02081. 1-800-669-4128. Note: Topcoat W.O.B. is produced in the Caribbean, and while readily available there, it can be difficult to obtain in the Continental U.S.

• Vulkem 450/451 PWC and Vulkem 450/451 PWC Red are elastomeric paints rolled or brushed onto a roof surface. According to a representative of the manufacturer the products are currently used in Bermuda and the Virgin Islands, but may be difficult to acquire within the continental U.S. Vulkem 450/451 PWC is manufactured by Tremco Incorporated, Mameco Manufacturing Division, 4475 East 175th Street, Cleveland, OH 44128. 216-752-4400.

• 2001 Super-Flex 100% Acrylic Elastomer Roof Coating, 3000 Acrylic Barrier Coating, and TK2001 Elastomeric Finish are all manufactured by the Scott Paint Company, 7839 Fruitville Road, Sarasota, FL 34231. 941-371-0015

• MirrorSEAL is a continous filament, single-ply, fluid-applied roofing system. It is a non petroleum-based polymer. Due to its white color it is very energy efficient in hot climates. It is soon to be tested by the National Sanitation Foundation International (NSF) to see if it is approved as a potable water catchment coating that complies with the requirements of NSF Protocol 151 “Health Effects from Rainwater Catchment System Components”. Currently it has been tested and certified by the FDA 175-300 as approved for Direct Food Contact. The EcoHood in Phoenix, AZ has used it and is very pleased with its performance.
Mirror Seal
1810 S. 6th Avenue
Tucson, AZ 85713
PHONE 520-628-1553
http://www.innovativeformulations.com/mirror/index.html

• Environmental Liquid Membrane System (ELMS)
A USDA Certifiec Biobased Solar Reflective Soy Oil Polymer Roofing Material for Low Slope Roofing Assemblies
http://www.greenproducts.net/products/products.html

In Tucson, AZ
• MirrorSEAL is a continous filament, single-ply, fluid-applied roofing system. It is a non petroleum-based polymer. Due to its white color it is very energy efficient in hot climates. It is soon to be tested by the National Sanitation Foundation International (NSF) to see if it is approved as a potable water catchment coating that complies with the requirements of NSF Protocol 151 “Health Effects from Rainwater Catchment System Components”. Currently it has been tested and certified by the FDA 175-300 as approved for Direct Food Contact. The EcoHood in Phoenix, AZ has used it and is very pleased with its performance.
Mirror Seal
1810 S. 6th Avenue
Tucson, AZ 85713
PHONE 520-628-1553
http://www.innovativeformulations.com/mirror/index.html