Building A Deck Over A Drain Field

Building over field lines.

Building a deck over a drain field.

Because of the moisture levels and the need for free air movement no permanent structures. Building near a drain field leach field if a drain field is damaged it can cost a lot more to replace. Can you build a deck over a septic field. With structures such as decks.

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. 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. The biggest issue that can arise from construction near a drain field is the damage caused by heavy construction equipment.

You may run into expensive problems a few years down the road. Building a deck over a septic tank it is usually not a good idea to build a deck near or on top of a septic tank. If constructing over field lines it is imperative that no foundation is dug. A big risk to building over the drainfield is causing the lines to collapse.

Most zoning ordinances will require that you maintain at least a 5 setback from an underground septic system. Also the soil can compact around the trenches which may not allow for percolation. Building a permanent structure over the tank or drain field is usually a bad idea.