Drain Excavation in Milton, GA

Drains that ended up under later construction

Houses change over the years. A sunroom fills in what used to be a patio, a screened porch gets a concrete floor, a deck wraps around the back, or a family room addition pushes the footprint out into the yard. Any of those projects can end up sitting on top of a drain line that was laid long before. When that buried pipe breaks, the question becomes how to reach it without dismantling something that took real money and effort to build. Drain excavation under or beside an addition takes more planning than digging in an open lawn, and Milton homeowners can make it easier by knowing what was built over what.

Why the joint between old and new is a weak spot

When an addition gets its own bathroom or laundry, its drain is usually tied into the original house drain somewhere near the old exterior wall. That connection joins pipe laid at different times, sometimes in different materials, under two foundations that may settle at slightly different rates. A small difference in movement can crack a fitting, open a joint or create a dip. Typical signs include slow drains that start in the addition, gurgling when its fixtures empty, or dampness along the line where the new floor meets the old.

Working out what is under there

Permit drawings for the addition, if they can be found, may show how the plumbing was routed. Running a sewer camera inspection fills in the rest. The camera is pushed from a cleanout or fixture until it reaches the damage, and a locator above marks the position and depth, even through a slab floor. That shows whether the break sits under the addition itself, under the original house, or out in the open where nothing built has to be disturbed.

Ways in, from least to most disruptive

• From an open side. If the break lies just outside the addition, a trench in the yard may reach it without touching the structure.
• Under a deck. Many decks allow digging between the posts once a few boards are lifted, and those boards are fastened back afterward.
• Beneath a porch or sunroom slab. A short tunnel dug in from the yard can sometimes reach pipe under a slab without cutting the floor.
• Through the floor. When the pipe lies well inside, a saw cut through the addition's slab is the direct route.
• Around it. Now and then the simplest answer is to abandon the section under the addition and run a new line around its outside.

Making the new joint last

Whatever the route, the repair should allow for the movement that caused the trouble. The new section is joined with shielded couplings that keep their alignment, bedded firmly so it cannot sag, and laid with a steady fall across the transition between foundations. Before anything is closed, the pipe is run with water and checked, and the inspector sees it uncovered. If another addition is in your plans, talk with our new construction plumbing team early so the drains can be routed with future access in mind.

Permits and inspections in Milton

Permits in the city come from the City of Milton Community Development Department, and the city code generally expects one for plumbing work. Milton also has buried plumbing inspected once the pipe is set and before any backfill, so a repaired joint under an addition stays exposed until the inspector has seen it.

Questions about drains under additions

Will lifting deck boards damage the deck?

Usually very little. Screwed-down boards come up cleanly and go back in place, while nailed boards or hidden fasteners may split a board or two that then needs replacing. Older, weathered boards can be hard to match exactly. The joists and beams are normally left alone unless a post or footing happens to sit right on the pipe.

Can the drain be moved out from under the addition?

Sometimes. Rerouting means running a new drain around the outside of the addition and abandoning the buried section beneath it. It can spare a finished floor, but it only works if the new route keeps enough slope, and fixtures inside the addition still need a way to connect. The layout decides whether it is practical.

Why did the problem start years after the addition was built?

Settlement often takes time. Soil under a new foundation compresses gradually, and a joint that was fine on the first day can shift a little each year until it opens or cracks. Roots and slow buildup at a slightly offset joint can also take years to cause a backup anyone notices.

Plan around what you have built

If drains in or near an addition at your Milton home are giving trouble, we can help you find the least disruptive way to the pipe. Our number is (404) 409-4448, and a description of what was built where makes a good start to the call.