Building A Deck Over A Drain Field

Because of the moisture levels and the need for free air movement no permanent structures.

Building a deck over a drain field.

The lack of regular pumping of your tank will be a costly mistake which can also affect you again when you sell. However if a permanent structure is built over a drainfield it can restrict the oxygen flow into the soil and restrict the evapotranspiration process. Here are three things to know in advance. Usually decks are allowed over drainfields as long as the piers of the deck are at least two feet from the drainfield trenches and as long as the deck footings do not support a roof.

Most zoning ordinances will require that you maintain at least a 5 setback from an underground septic system. You may run into expensive problems a few years down the road. The biggest issue that can arise from construction near a drain field is the damage caused by heavy construction equipment. Also the soil can compact around the trenches which may not allow for percolation.

If you have a septic system and want to add a deck to your house or build a shed in your backyard you should consider the consequences carefully. Building a permanent structure over the tank or drain field is usually a bad idea. If constructing over field lines it is imperative that no foundation is dug. Building over field lines.

If you have a deck or patio with no access to the tank you may have to rip out the structure wasting all the money spent to build it. With structures such as decks. A big risk to building over the drainfield is causing the lines to collapse.