Quote:
Originally Posted by BlackArcher101
Backflow valves aren't the end-all be-all of preventing sewer backup. Like all valves, they should be cleaned/maintained to ensure they will close when required. As well, over pressure if the house is in a low area and from a large rain surge is still possible.
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The bold part is what worries me. So I go and install one of these valves and it works flawlessly. But if the city infrastructure fails again and our street and back lane become a lake I will have a lot of pressure pushing on my dry basement. Greatly increasing the chance my foundation shifts or worse right?
Frankly I'd rather have my basement flood again to equalize the pressure in that situation.