# LDD-13 · South Bay Layout

> **Status:** 🟡 LOCKED workflow logic; dimensions need reconciliation.

## One-line intent

A workflow-driven system, not just space allocation — west = production, middle = service, east = parking.

## Why this matters

The south bay is the building's working zone, where every other zone's daily friction shows up: parking, receiving, building, fixing, storing. The workflow-first organization is correct. Getting it wrong means daily frustration for the next 50 years.

## Locked decisions

**Overall**

- 60' E–W × 30' N–S
- LOW (Lift Over Workshop) above (second floor)

**West → East sequence**

1. Equipment room (10' × 13')
2. Workshop WC
3. Workshop main (~23' × 16' work zone with 7' clear transport spine)
4. Service zone
5. Lift (6'×7' shaft, 5'×6' platform — **NOT optional**)
6. Hybrid receiving / storage bay
7. Garage bays (3-car)

**Workflow logic**

- West → production (equipment, workshop)
- Middle → service (WC, lift)
- East → parking (3-car garage)

**Equipment room**

- ~10' × 13'
- Contains dust collection + compressor
- Purpose: noise isolation + system hub

**Workshop main**

- ~23' × 16'
- Central open zone
- 7' clear transport spine routes material from work zone to lift

## Open items / requires engineer review

- **Dimensions don't close at 60'.** Equipment 10' + workshop 23' + service/lift ~7' + hybrid (?) + 3-garage (3 × 9–10' = 27–30') = at least 67'. Either workshop is shorter, garages are narrower (≤8' each, which is tight), or the layout overlaps unconventionally. Reconcile.
- **Lift specs** — 6'×7' shaft, 5'×6' platform — capacity? Hydraulic vs traction? Power requirement? Code-compliant openings (in-floor vs through-floor)?
- **Hybrid bay function** — receiving for what? Packages? Vehicles? Equipment? Affects door size, fire rating, electrical.
- **Garage door specifications** — 3 bays, but door type (sectional vs roll-up), width per bay, header height, opener type, glazing all unspecified.
- **Equipment room ventilation + cooling** — dust collection generates heat and noise; needs spec'd HVAC + acoustic treatment.
- **South wall exterior detail** — large garage doors mean the south face is mostly opening; how does that interact with the matte-dark IMP envelope intent?

## Cross-references

- → [LDD-14 workshop + equipment](14-workshop-equipment.md) — internal workshop strategy.
- → [LDD-09 electrical](09-electrical.md) — workshop/LOW subpanel.
- → [LDD-02 radiant](02-radiant-slab.md) — south manifold cluster, maintenance-density tubing in garage, mixed strategy elsewhere.
- → [LDD-10 plumbing](10-plumbing.md) — south plumbing cluster.

## Cost drivers

The south bay is mostly **shell + concrete + service zones**; the costly bits are the lift and garage doors.

- **Lift (6×7 pass-through, residential / light commercial)**: hydraulic platform lift $25–55K installed, including shaft enclosure and code compliance. **Single biggest line item in this LDD.**
- **3 garage doors with operators**: $4–9K each = **$12–27K**.
- **Hybrid bay door** (assumed garage-style): $3–6K.
- **Equipment room buildout** (dust + compressor mounts, acoustic treatment, pass-through): $5–10K.
- **Workshop slab + drainage**: included in radiant + slab budgets.

**Likely-case rollup: $50–105K**, dominated by the lift. Budgeted at $95K in waterfall (workshop + lift combined).

## Air-gap concerns

1. **The lift is the single largest risk concentration in the entire building.** It's labeled "NOT optional," has one short LDD, and gets named in 3 other LDDs as a coordination point — but there is **no service contract, no failure-mode plan, no redundancy strategy**. If the lift fails (and lifts do fail — they have hydraulic seals, motors, and electronics), you lose access to LOW until the service tech arrives. For a 50-year build, plan for it: spec a manufacturer with parts availability, set up a maintenance contract, document the operator manual.
2. **Dimensions need reconciliation.** Either workshop is smaller than 23' E–W, or garage bays are narrower than 9' each, or hybrid bay is squeezed. Tighten this before any structural shop drawings — the south bay PEMB frame is at 90' to 120' grid, so there's no internal column to anchor sub-zone widths.
3. **South face wall area.** With 3 garage doors + hybrid bay door + possible equipment room access, the south face may be 50–70% openings — that's mostly door, very little IMP. Verify thermal performance of the south face envelope; doors are usually R-6 to R-12, vs IMP at R-26+.
4. **Equipment room noise control.** Dust collector + compressor are loud (85–95 dBA at the equipment). The LDD calls for "noise isolation" but doesn't spec how. Mineral wool + double-stud + sealed wall + sound-rated door + air sealing. Budget $4–8K for serious acoustic treatment if you want the rest of the south bay quiet.
5. **Workshop main vs hybrid bay overlap.** "7' transport spine" suggests material moves from workshop main, through the lift, up to LOW. That means the hybrid bay is **not** between workshop and lift — it must be on the east side, adjacent to garages. Confirm.

## Diagram

![South bay west-to-east layout: equipment, WC, workshop, lift, hybrid, 3 garage bays](../../diagrams/05-south-bay-plan.svg)

## Status

🟡 **Yellow — workflow is right, dimensions don't close, lift risk needs management plan.**