New Construction Plumbing in Holly Springs, GA

The cheapest place to fix new construction plumbing is on the drawings. A drain that cannot pass a beam, a vent with no route to the roof or a bathroom over an unheated garage is a five-minute conversation during plan review and an expensive change once framing is up. For builders and owners in Holly Springs, a plumbing review of the plans before construction starts is time well spent. That review comes first, before any new construction plumbing goes into the ground.

Stacks and the structure

The first pass looks at where the vertical drain stacks will run and what they will meet on the way down. A stack from a second-floor bathroom needs a wall that lines up with something below, a chase or a closet. Do not cut or drill structural members unless the opening is part of the engineered design or has been specifically assessed by a structural professional. Floor systems matter as well: engineered joists and floor trusses carry rules about where holes may go, and a large toilet drain may have to run parallel to them rather than across.

Kitchen islands and other open spaces

An island sink is a classic flag on a set of plans. Its drain has to run under the floor to a wall, and its vent cannot rise straight through a countertop. Common answers are an island fixture venting arrangement under the cabinet or an air admittance valve where its manufacturer's instructions and the design allow one, and the choice affects what goes in during the underground or rough-in stage. The same thinking applies to a wet bar in the middle of a great room.

Rooms over the garage and exterior walls

A bonus room or bathroom above a garage puts supply and drain lines in a floor that borders unheated space. Those pipes need to sit on the warm side of the insulation, or the floor must be insulated and sealed with care, so a hard freeze does not split a line. Supply piping in exterior walls is likewise best avoided; where it cannot be, insulation placement becomes important.

Water heater location and venting

Plans often show a water heater in a garage corner or on an attic platform without showing how it vents or drains. A gas water heater needs a vent route suited to its type, combustion air and a gas line sized for it. Any heater in an attic or on an upper floor needs a drain pan with a path to a suitable drain point. Sorting this out on paper avoids a mismatched vent or a pan with nowhere to empty.

Fixture schedule and shutoffs

• Make sure every fixture on the plans has a model, or at least a type, chosen, especially those with special rough-in needs such as wall-hung toilets or thermostatic shower valves.
• Show where the main shutoff will be and confirm it is reachable.
• Plan individual shutoffs at each fixture, which keep later faucet and valve repair simple.
• Mark hose bibs, the laundry box and the refrigerator water line on the drawings.

Plan review questions for Holly Springs homes

What should I bring to a plumbing plan review?

The full architectural set with floor plans, elevations and the truss or joist layout if it exists, plus a fixture list, the water heater choice and a site plan showing where water and sewer reach the lot. Notes on any bathroom or basement you might finish later help as well, since its drains and vents can be roughed in now.

Can an air admittance valve vent a kitchen island?

In some cases, where the valve manufacturer's instructions and the design allow it for that use. The valve lets air into the drain when water flows but does not let sewer gas out, so it does not replace the vents to open air that the system still needs. Confirm the installation details with the designer before counting on one, and keep it accessible.

Send us your plans

Have drawings for a new home in Holly Springs? Call (404) 409-4448 to set up a plumbing review, and we will flag the conflicts before they reach the framing.