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Problems with new asphalt roof
Moderator(s): John Hammerstrom
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1/11/2014 at 4:59:48 PM GMT
Posts: 40
Problems with new asphalt roof

System Profile
We installed a RWH System on a new home. 4000 Sq Ft roof. 5100 gal of storage (3 – 1700 gal UG tanks). Wisy pre-filter and tank components, 1 HP sub pump. Conveyance is all S&D or S-40 Foam Core. Pressure line to hse is 1 ¼ PEX. Filtration is a 1m Sed and a 5 mic carbon block (both 4.5” x 20”) plus UV. RO is installed to service a drinking water tap at the kitchen sink and the refrigerator ice/water dispenser. RWH is for primary potable and general household use. Secondary, with auto crossover, is municipal water. (SEE ATTACHED STAMPED DRAWING)


The Problem
The water has been yellow since startup 19 months ago. Yellow entering the tank and yellow post filtration. The Wisy pre-filter has clogged  consistently with a tarlike substance about every 3 months.


Attempts to Remediate

1.      We have pumped out 5000 gal and hand cleaned the tanks to like new condition 3 times. I added a 10” x 47” carbon backwashing filter. Very little difference and only for a short time.

2.      We have changed the 4.5” x 20” probably a dozen times.

3.      Sent a lab sample that was drawn at the intake of for the Wisy vortex filter after about 4 hrs into a steady rainfall event. (SEE ATTCHED NTL LAB REPORT).

4.      Acquired the MSDS for the exact roofing material (SEE ATTACHED MSDS).

5.      Sent an inquiry to a regional rep at TAMKO who referred me to corporate. Received a response. (SEE ATTACHED 2 PART REPONSE) My inquiries with TAMKO were humbly seeking info and knowledge to which they responded very defensively and offered no rep to come see the situation or help in any other way.

6.      Since that time the homeowner has sent them high res pics and a complaint to which they respond "it looks good and keeps the house dry, that’s what you paid for, right?”


Being 30 yrs in water treatment the organic and inorganic contaminants do not necessarily constitute a deal breaker. However, applying the correct treatment is extremely important in order to responsibly protect our clients. If however the contaminants are affecting the bio-deck (you like that word?) or somehow causing the stored water to be discolored, odorous, or slimy then we have a problem that might be a deal breaker. That is what we seem to have here. I just absolutely have to know what the root problem is so we know what roofs to apply RWH to and what roofs to flee from.


Thank you all for your interest. Both our client and me will be very happy to ID the problem and hopefully resolve to his satisfaction. I am eager to learn a whole lot more about RWH and asphalt shingle roofs.



Denis Rochat



ARCSA Accredited Professional

ARCSA Inspector Specialist

WQA Certified Water Specialist


Rainwater Resources™ | PerfectWater™   

800 E. Gov. John Sevier Hwy.

Knoxville, TN 37920


 Attached Files: 
Analysis.pdf (100.06 KB)
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