Know How Your Run-Off Drainage System Works

It’s Fall and the rainy season is just around the corner.

A wet basement or crawl space is a common problem if you live in the Northwest because we live in an area that gets rainfall for most of the year. Add in the geography of our area which is hilly to mountainous, it’s understandable why the ground can stay wet for so long after we’ve had some rain. While water coming into your basement is an obvious problem to fix, why the big deal about water in the crawl space? Most homes with crawl spaces have structural elements made out of wood. Wood is susceptible to “dry rot” if it becomes saturated, then allowed to dry out, only to become saturated again. So standing water beneath your home can pose a dry rot threat because of the constant moisture. That’s why a moisture barrier (thicker black “visquine plastic” is often used) is put over the bare dirt in the crawl space to keep the moisture below from reaching your home, but even the moisture barrier may not be enough to protect your home.

Often the problems of damp or wet basements and wet crawl spaces are the result of poor drainage of the runoff from the roof and other impervious surfaces around your home. On a rainy day do you ever wonder where the runoff is going? Do your gutters drain onto bare ground, or are your gutters “tied in” to some other drainage system such as a foundation footing drain? Even if your gutters are tied into a foundation footing drain, where does the foundation footing drain empty? What kind of pipe is being used in the foundation footing drain system and is there sufficient grade in the footing drain system to carry the runoff away from the foundation?

All of these factors need to be taken into account, plus other considerations like the topography around the home. When you understand how your runoff drainage system really works, you can then take preventative measures to keep the drain lines open and able to carry off the water so your basement or crawl space can dry out. Sometimes a sump pump is necessary because there’s just too much underground water, sometimes a “french drain system” is necessary but your expert technician at Beacon Plumbing can help you solve the problem and protect your home!