Can You Collect Potable Water From An Asphalt Shingle Roof?

Can you collect potable water from an Asphalt Shingle RoofDo you have an asphalt shingle roof and thought you could not collect rainwater for potable usage?  Most roofing material in the Seattle area are asphalt shingle leaving many to think that they could not collect rainwater for potable usage or even use the rainwater from roof top collection for watering vegetables.

RainBank Rainwater Catchment Systems has teamed up with Custom Pure and is now installing deionization, along with other filtration and disinfection, so rooftop collected rainwater from asphalt shingle roofs can be used for potable use.

“We have been researching and sampling raw rainwater from asphalt shingle roofing and have found that rainwater is ideal for deionization and, along with other filtration and UV disinfection, we can produce ultra pure water of laboratory quality”,  explains Ken Blair.  “This process allows those with this type of roofing material to enjoy the benefits of rainwater collection.”

Complete this form if you have questions about collecting potable water from your asphalt shingle roof.

How to Build a Rainwater Collection System – Part 5

This is Part 5 in the series “How to Build a Rainwater Collection System”.  Click to see parts onetwothree and four.

How to Build a Rainwater Collection System - Part 5Steel water storage tanks for rainwater collection are generally bolted together grain silos adapted for this use. Made of galvanized corrugated steel panels, wall panels average 17 – 20 gauge with the galvanized roof panels being high rib or flat seam with a center hatch at the top and an access hatch near the bottom of the roof. A felt pre-liner is used between the steel and the main liner to protect it from abrasion. Liners are usually polyethylene and NSF approved when used for potable application or PVC, which is generally used for non-potable. However, PVC can be used for potable, as long as it is NSF approved.  RainBank recommends polyethylene for this application.

Steel tanks need to be built on a engineered cement slab with hold-down anchor brackets designed for the seismic zone where the tank will be placed. Plumbing for overflow, suction, discharge and any cross over lines used in multiple tank applications can either be PVC flanges, polyethylene or PVC boots if coming up through the cement slab. If penetrating through the side of the wall panels, PVC flanges will need to be used.

How to Build a Rainwater Collection System - Part 5Steel water storage tanks offer durability and protection of the liner from UV rays, plus offers an industrial or rural architectural look. Many commercial applications use this type of storage for both of these reasons. Overflow lines can be installed on the outside of the tank, but it is recommended that any pressurized lines be underground and frost protected in our Washington climate.

Accessories include exterior ladders, platforms, and level gauges. The galvanizing does not need painting although if properly prepped, tanks can be painted to suit.

Assembly can be difficult for the homeowner or contractor, so it is recommended that a trained installer with the proper tools and knowledge be used.

Are you interested in building your own water harvesting system?  Leave a comment below.

Should You be Concerned About Storm Water and the Seattle Environment?

Should You be Concerned About Storm Water and the Seattle Environment?Storm water is a concern in the Puget Sound area. Storm drains are overwhelmed during a large event resulting in sewage being released in our waterways. Fish, shellfish, and marine animals experience the brunt of these spills. Plus, toxins from roof run-off enter our storm water systems with every rainfall. Roof runoff carries oil from our driveways into the drain system and into the Puget Sound. Pesticides, fertilizers, and pet fecal matter is carried from or roof runoff into the street drainage system and into the storm water resulting in these pollutants entering the ecosystem.

By collecting the rainwater from our roofs and redirecting it to be used for irrigation, laundry facilities, toilet flushing, and potable whole house usage, residential runoff can be greatly reduced causing less impact on our environment.

The State of Washington has allowed rainwater collection for residential and commercial usage since 2009.

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