Why Downspout Extenders Are Important!
I got a call from a buyer last year on the day she did her final walkthrough. We had 2" of torrential rain the night before and she was wondering why the cellar of her 1850's stone foundation home was flooded. I went back and looked at my notes and sure enough noted that one of the downspout extensions was completely missing (not the same house as the one in the picture above which is a poured concrete foundation). Without an extender (and don't think a "splash block" would have helped much), the water just dumped against the foundation, through the rocks, and into the cellar. How much water? Well, the one side of her gable roof was 20' x 40', so that's 800 square feet. We had 2" of rain, so divide 800 by 6 and you get 133.33 cubic feet of water. One cubic foot of water is ~ 7.5 gallons so that's about 1,000 gallons. That's a lot of water! How do we avoid water intrusion? Get the water away from the home! If you can divert the water at least six feet away from the house or even better divert it to another location (such as a storm drain) then that would be ideal. There are other factors that have an impact though. If the gutter or downspout is clogged or just can't keep up (a 3' x 4" downspout can handle a maximum of 100 cubic feet of water per hour), then the water will overflow the gutters again landing at the foundation. The moral of this story is that with global warming, and more violent and prolonged rainstorms, to have a dry house, you need to keep those gutters and downspouts clean, get the water away from the house, and keep it away from the house!


