Estimated effort: 12 hours

Overview: What and Why

Two systems this week, deliberately combined, because both are terminal distribution systems that follow the same logic: a source, a network, and a set of endpoints. They also fail in the same way, by running out of room in the plenum you have already given to structure and ductwork.

Plumbing is governed by gravity. Supply piping goes anywhere you like under pressure, but sanitary drainage must slope downward, continuously, all the way to the sewer. That single constraint drives where restrooms can be, where risers must go, and how much ceiling you lose.

Power and lighting is governed by circuits and panels. Everything traces back to a panel, and every panel traces back to a service. Lighting also has to actually light the space, which is a performance question, not just a placement question.

You placed the plumbing fixtures in Week 5. This week you connect pipe to them.

Focus: What You Are Adding This Week

Plumbing, in one typical restroom stack

• Piping systems: cold water, hot water, sanitary
• A sanitary riser
• Optional if part of your design: greywater reuse

Power and lighting, in one representative zone

• Power receptacles and outlets
• Power circuits and a panel
• Lighting fixtures and switches
• Lighting circuits and a panel

Design Program

• A linked plumbing model and a linked electrical model, both sharing coordinates with the rest.
• Plumbing: one typical public restroom on one level, piped for hot water, cold water and sanitary, connected to a riser. Then copied to the stacked restrooms on other levels. The fixtures are already in your architectural model from Week 5. Do not re-place them.
• A located sanitary riser with a defensible reason for its position.
• Power: one representative zone, roughly one floor or one major program area, with receptacles, circuits and at least one panel.
• Lighting: the same zone, with fixtures, switches, lighting circuits and a lighting panel.
• An estimated illumination spot check for one space, comparing average estimated illumination against a target appropriate to its use.
• An electrical analytical model with power demand estimated from your Spaces.

Getting Started

Plumbing

1.  Create a new linked plumbing model and link the architectural and structural models.

2.  In one typical restroom on one level, connect the existing fixtures with cold water, hot water and sanitary piping.

3.  Route the sanitary line to a riser and locate that riser deliberately.

4.  Copy those piping elements to the stacked restrooms on other levels.

5.  If greywater is part of your design goals, add one demonstration run.

Power and lighting

1.  Create a new linked electrical model.

2.  Build the electrical analytical model and estimate power demand using your Spaces.

3.  Place electrical equipment and a panel, then devices and receptacles, then create a power circuit.

4.  Place lighting fixtures and switches in the same zone, then create a lighting circuit and a switch system.

5.  Spot check the average estimated illumination in one space against a stated target.

How Detailed Should This Model Be?

A representative slice done properly teaches more than a whole building done superficially. One restroom stack and one zone of power and lighting is the target. Do not attempt the entire building.

As with HVAC, do not agonise over pipe or conduit connections that refuse to cooperate. Get the logic right and the intent legible.

How This System Affects the Others

• Sanitary drainage is the constraint that bites. If your restrooms sit far from the riser, the required fall pushes piping down into your architectural space. If that happens, consider adding a mechanical space for a closer riser rather than accepting a dropped ceiling.
• Piping generally routes below the structural framing to avoid interference. It can pass through beams with planning, but only where the penetration does not compromise the beam.
• Your envelope drove your lighting load. Good daylighting from Week 4 should mean fewer fixtures and a smaller lighting circuit now. Check whether it did.
• Your HVAC equipment needs power. The air handler you placed in Week 7 has to be fed from a panel you place this week.
• Everything you add now shows up in Week 9. This is the last week you create geometry. Next week you find out where it collides.

What's Expected

1.  Linked plumbing and electrical models with correct shared coordinates.

2.  One typical restroom piped with all three systems and copied to the stack.

3.  A located sanitary riser with a written justification.

4.  Power system in a representative zone: receptacles, circuits, panel.

5.  Lighting system in the same zone: fixtures, switches, circuits, panel.

6.  An illumination spot check for one space against a stated target.

7.  An electrical analytical model with estimated power demand.

8.  One combined MEP sheet set: one plumbing plan, one riser diagram or section showing the sanitary fall, one power plan, one lighting plan.

9.  A note on any conflict you found between piping and structure, and how you resolved it.

What to Submit

1. Working links to all five models in Forma Data Management: architectural, structural, mechanical, plumbing, electrical.
2. PDF sheet set at D size, 36 by 24 inches, four sheets.
3. Your illumination spot check result.
4. Design memo of 300 to 400 words: where the sanitary riser went and why, what gravity forced you to change, whether your daylighting reduced your lighting load, and what you left unresolved.

Sharing Your Project

Publish all five models to Forma Data Management, copy the latest versions into your Coordination Space, and walk the merged view. You now have every discipline in one place for the first time. Note what you see, because Week 9 is about fixing it. Post links and sheets on the Module 8 Notion gallery page.

Points to Ponder

Please share your comments on 3 of the following 5 questions on this linked Notion page.