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
List of 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

Tucson
MasterCraft Metals, Inc.
Standing Seam Roofing
(800) 607-7468
(520) 792-2418
www.mastercraftmetals.com

Roof Ops Roof Options
Corrugated, Galvanized, Rusted, R Panel, Metal Tile, Metal Shingle
(520) 318-4364

Allied Building Products
(520) 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 approved potable water catchment coatings that comply 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
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). Manufactured by Finnaren & Haley Inc., Conshohocken, PA.
www.weatherbarrier.com/wb2000.html

Topcoat W. O. B. White (without biocide)
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., Walpole, MA. Note: Topcoat W.O.B. is produced in the Caribbean, and while readily available there, it can be difficult to obtain in the Continental United States.
(800) 669-4128

Vulkem 450/451 PWC and Vulkem 450/451 PWC Red
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 United States. Manufactured by Tremco Incorporated, Mameco Manufacturing Division, Cleveland, OH.
(216) 752-4400

2001 Super-Flex 100% Acrylic Elastomer Roof Coating, 3000 Acrylic Barrier Coating, and TK2001 Elastomeric Finish
All 3 products are manufactured by the Scott Paint Company, Sarasota, FL.
(941) 371-0015

Environmental Liquid Membrane System (ELMS)
A USDA Certifiec Biobased Solar Reflective Soy Oil Polymer Roofing Material for Low Slope Roofing Assemblies
www.greenproducts.net/pages/elms50.html OR
www.greenproducts.net/pages/elmsplatinum.html


Tucson
MirrorSEAL
A continuous-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.
(520) 628-1553