New Construction Plumbing in Norcross, GA

In a new house, the mechanical room or utility closet is the busiest few square feet on the plans. The water heater, the furnace or air handler, the main water shutoff, gas piping, condensate lines and sometimes an expansion tank or water filter all crowd into it. When the new construction plumbing and the HVAC work are planned separately, that room is where they collide. In Norcross, the same building official reviews and inspects plumbing, fuel gas and heating and air work, which makes planning them together even more natural.

Condensate needs a planned destination

Air conditioners pull moisture out of the air, and high-efficiency furnaces and condensing water heaters produce condensate as well. That water must go somewhere. If the plumbing rough-in leaves no drain receptor near the equipment, the HVAC installer ends up running tubing across the floor to a laundry sink or out through a wall. A better plan places a trapped receptor or a dedicated condensate drain within reach of each unit during rough-in. Equipment installed in an attic usually gets a secondary drain pan or an overflow switch, since a clogged line above a ceiling causes stains long before anyone notices.

Vents that do not fight each other

A gas water heater and a gas furnace each need a vent, and the type depends on the appliance. Older-style atmospheric units use metal flues that rise through the house, while condensing units often vent sideways through plastic pipe to an outside wall. Shared vents, clearances to framing and termination locations all follow the code and the manufacturer's instructions. Settling which appliance vents where, before framing is finished, keeps a flue from being blocked by a beam or forced into an awkward offset.

Room to work and room to replace

• Leave enough space in front of the water heater and furnace to service them and to pull the old units out someday.
• Set the water heater in a pan piped to a safe drain point when it sits above finished space.
• Keep the main shutoff where anyone in the house can find it and reach it quickly.
• If a water softener or whole-house filter is likely, leave wall space and a drain for it now.

Where the water supply comes in

The mechanical room is often where the water service enters, so it makes sense to group the main shutoff, a pressure-reducing valve if street pressure runs high, and a thermal expansion tank near the water heater. Mounting them together, labeled, makes future service quick. When pressure issues show up after move-in, our water pressure and PRV service can test the system and adjust or replace the valve.

Gas for two appliances

If both the furnace and the water heater burn gas, the line feeding the room has to carry both at full demand, plus any range, dryer or fireplace elsewhere on the same system. A gas water heater placed next to the furnace can share a well-sized branch, with an accessible shutoff and a sediment trap at each appliance. Size the gas piping only after the HVAC contractor confirms the furnace model.

Scheduling inspections in Norcross

Because the city's Building Official handles plan review, building permits and inspections for plumbing, fuel gas and heating and air work alike, plumbing and mechanical rough-ins tend to come up for inspection around the same point in the build. Inspections are requested on an automated phone line, and according to the city's FAQ, inspections usually take place the next day when requested in time. Coordinating so the plumber and the HVAC contractor finish their rough work in the same window can keep the drywall crew on time.

Mechanical room questions in Norcross

Where should the AC condensate drain go in a new house?

Into a drain point the plumber provides during rough-in, close to the air handler or furnace, such as a trapped standpipe or a dedicated condensate line that ties into the drainage system as the code allows. Planning it early avoids tubing run to a sink or out a wall. Attic units usually also get a secondary pan or an overflow switch.

Can the water heater and furnace share a vent?

Sometimes. Two atmospheric gas appliances can often share a properly sized common vent, while condensing units generally need their own plastic venting as the manufacturer specifies. The answer depends on the appliance types, the vent sizing and the code in force, so the plumber and the HVAC contractor should settle it from the actual models before framing.

How much room does a water heater closet need?

Enough to meet the manufacturer's required clearances, reach the controls and valves, and remove the unit without tearing out a door frame or wall. Allow extra space if an expansion tank, a pan drain or a recirculation pump will sit nearby. The plumber and the designer should check the closet size against the actual model before framing.

Start with the utility room

Working through the plans for a new home in Norcross? Call Alpha at (404) 409-4448, and we will sit down with your HVAC contractor's layout and work the mechanical room into the rest of the new construction plumbing.