Basement French Drain - Insects

Old 07-02-19, 02:15 AM
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Basement French Drain - Insects

We have a French drain in our basement (also called tile drain system). Thereís a buried pipe along the walls that empties into a sump/pump. Whatís visible on the surface is a 1-2 inch deep trench along the perimeter, probably only half an inch wide.

The house is on a sloped hill and the drain works to prevent flooding. Problem is, I noticed the trench attracts a lot of bugs. Itís always got water in it and the area swarms with bugs at times. Crickets, spiders, centipedes, etc.

Any tips to cover it? I know sealing it over is bad but Iíd like it if there was some way to prevent bugs from getting into and out of it. Maybe a screen or cover? Any ideas?
Old 07-06-19, 05:35 AM
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The surface trench should be / should have been connected to some place where it drains. Such a connection could be to the (or a second) sump pump pit (requires a downslope within the trench to said pit) or spaced holes where accumulated water can seep down to the tile drain system.

Where did the water in the trench come from? If the water seeped up from under the floor then there is some malfunction in or incorrect construction of the tile drain system. Water should not remain exposed in the trench. The drain tile system should be below basement floor level. An exposed trench can be used in lieu of an underground drain tile system but is inferior due to the problems you described and because more evaporation into the interior air space can occur and interior humidity can rise above desired levels requiring more use of a dehumidifier.

The surface ground around your house may need additional treatment to keep water from accumulating against the foundation. There should not be a depression in the "normal" soil around the foundation filled with gravel or mulch.

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