After framing passes inspection, you can begin mechanical systems rough-ins. Rough in refers to the parts of a system that reside in the attic, crawlspace of wall cavities of the home. Four systems require a rough in phase before insulation or sheetrock are added to your new home – plumbing, sprinklers, heating and air conditioning (HVAC), and electrical.
We recommend that your first mechanical system rough in be plumbing. Plumbing materials are rigid and require proper placement and fall, and these materials do not easily flow around other systems. When you made your pre-construction decisions, the placement for cabinets, vanities, tubs, showers, and toilets, designed a plumbing system for a licensed plumber to connect a water supply and sewer discharge to for maximum efficiency. The plumbing rough in receives an inspection and must adhere to codes requirements before passing inspection.
More and more jurisdictions are requiring the use of sprinkler systems in residential homes. Check the jurisdiction you are building in to ascertain whether or not you will be required to include a sprinkler system in your home. If you are required to include this system, the rough in should be completed before electrical or HVAC systems are started.
The electrical system rough in follows the plumbing rough in. Your builder should have a final electrical walk through with you before the electrician starts wiring your home. People often find their lighting requirements change when they actually walk through their framed home. Standing in a room allows you to visualize the placement of furnishings, so you can actually tell where you need a receptacle or additional lighting. Task lights, spot lights, recessed lights, and track lights added at this stage of construction cost less now that at the end stage of construction because the additional labor required is minimal. If your home will require any special wiring, such as security systems, intercoms, surround sound music, or central vacuum systems, now is the time to plan for those additional features. A licensed inspector, employed by the state you live in, will perform the electrical rough in inspection.
The HVAC system rough in follows plumbing, sprinklers, and electrical, and the inspection for this system often occurs at the time of the plumbing inspection. Flexible duct lines that direct the conditioned air in your home are routed over, under, and around other systems. The placement of equipment housed inside the attic of the home occurs at this point. Codes requirements dictate that plywood flooring be placed around units in attics so the equipment is accessible for service. A tip for you about HVAC systems…screw down plywood covers over any vent openings in the floors. This will keep debris from accidentally falling into your air supply lines.
Please do pay special attention to the order that systems are added into your home. A good cook knows not to rush the process, and a good builder knows this, too!