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Roofing screws in the alleys rather than the ridges

Roofing screws in the alleys rather than the ridges

Roofing screws in the alleys rather than the ridges

thread594-428086: Roof lapping on a water reservoir

To all who responded last time i sought advice on the roof of this reservoir.
I finally got the froofing sheets replaced and lapped the correct way. However i could not get a win on the screws being in the valleys rather than the ridges. Apparently some engineer somewhere signed off on this design and the tank company were not going to change it.

However we did a flooding test on the reservoir roof. Well it did not even get to be a flood , just a guy up top with a hose and surprise, surprise the roof leaked like a sieve. Every screw now has to have a coating of mastic applied around it to seal it off.

This is not good for a treated water reservoir. Given that there are a lot of this style in use, there is probably a few potential contamination sources amongst them.

"Any water can be made potable if you filter it through enough money"

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