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feat(specs): add whole-house water system and cellar datacenter specifications with cross-document coordination updates

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Jürgen Kunz
2026-03-15 11:13:40 +00:00
parent 8f7547f4ae
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specs/03-baufritz-coordination-spec.md
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@@ -6,6 +6,8 @@ This document specifies requirements that must be communicated to and coordinate
**The air system is not a retrofit. It must be designed into the structure from the beginning.**
**The house includes a reinforced concrete cellar** housing a home datacenter (4x 42U racks, 10 kW cooling) and goods elevator. The cellar is built first; the Baufritz timber-frame is erected on top. See 06-datacenter-spec for full cellar, elevator, and datacenter specifications.
---
## 2. Technical Room Requirements
@@ -16,7 +18,7 @@ A dedicated technical room is required for the air handling equipment. This is n
| Parameter | Requirement |
|-----------|-------------|
| Floor area | 4–6 m² minimum (ideally 6–8 m²) |
| Floor area | **8–10 m²** (air system + water treatment — see 05-water-system-spec Section 11.1) |
| Ceiling height | ≥ 2.4 m |
| Access | Full-width door (≥ 900 mm), no obstructions |
| Floor | Waterproof, drainable (steam humidifier condensate) |
@@ -208,19 +210,36 @@ If the house includes an attached garage:
| MVHR dedicated | 230V / 16A | MVHR unit power |
| Humidifier dedicated | 230V / 16A (or 400V / 3-phase) | Steam humidifier (high wattage) |
| Controls | 230V / 10A | KNX power supply, gateway, sensors |
| RO booster pump | 230V / 16A | Reverse osmosis feed pressure (see 05-water-system-spec) |
| Distribution pump | 230V / 10A | Water distribution pressure |
| UV sterilizer | 230V / 10A | Post-storage UV-C sterilization |
| Recirculation pump | 230V / 10A | Hot water recirculation loop |
| Backup/spare | 230V / 16A | Future expansion |
### 8.2 Building-Wide Wiring
### 8.2 Main Electrical Distribution
The total house electrical demand including the cellar datacenter requires a properly sized main distribution:
| Parameter | Specification |
|-----------|--------------|
| Main fuse | **3×80A** (400V 3-phase) = ~55 kW capacity |
| Main distribution board | Located in cellar electrical room (see 06-datacenter-spec Section 4.2) |
| Sub-boards | Ground floor, upper floor, technical room (air/water), cellar/datacenter |
| Surge protection | Type 1+2 SPD at main board |
| Metering | Smart meter with Home Assistant integration |
### 8.3 Building-Wide Wiring
| Item | Specification |
|------|--------------|
| KNX bus cable | To every zone (MVHR dampers, sensors) |
| Cat6a shielded | To every room (sensor data, future-proofing) |
| Cat6a shielded | 2× per room (dual-purpose: data network + sensor — see 06-datacenter-spec Section 6.2) |
| Fiber backbone | 12-core OS2 single-mode from cellar to each floor (10G+ backbone) |
| 230V at sensor points | USB power for sensor units |
| Outdoor sensor cable | Weatherproof, north wall |
| ΔP sensor cabling | 5× runs from filter housing to control panel |
**All wiring for the air system must be specified on Baufritz's electrical plan before wall construction begins.** Retrofit wiring in a sealed timber-frame house is extremely difficult and expensive.
**All wiring must be specified on Baufritz's electrical plan before wall construction begins.** Retrofit wiring in a sealed timber-frame house is extremely difficult and expensive. The fiber and Cat6a backbone risers from the cellar must be coordinated with the elevator shaft and/or dedicated cable riser.
---
@@ -230,7 +249,12 @@ If the house includes an attached garage:
| Phase | Checkpoint |
|-------|-----------|
| Foundation | Radon membrane installed and sealed at all penetrations |
| Cellar construction | Reinforced concrete cellar complete, waterproofed, radon membrane sealed |
| Cellar construction | Elevator shaft cast, anchor bolt locations verified |
| Cellar construction | Cellar slab level tolerance verified (+/- 5 mm) for Baufritz erection |
| Cellar construction | Electrical conduits cast into cellar slab for riser penetrations |
| Foundation | Radon membrane continuous between cellar and ground floor |
| Framing | Elevator shaft opening integrated into ground floor structure |
| Framing | Duct routing voids verified, vertical risers in place |
| Framing | Ceiling void dimensions verified for Plafotherm + MVHR trunk |
| Pre-close | First blower door test (target ≤ 0.6 n50) |
@@ -241,10 +265,19 @@ If the house includes an attached garage:
| Interior finishing | Raised floor pedestals installed, subfloor leveling verified |
| Interior finishing | Under-floor services (ducts, wiring) installed and pressure-tested |
| Interior finishing | Floor panels and WOODline parquet tiles installed |
| Interior finishing | 316L stainless steel water supply runs installed in ceiling void |
| Interior finishing | Water supply pressure-tested at 16 bar for 2 hours |
| Interior finishing | All press-fit joints verified accessible via ceiling panel removal |
| Interior finishing | Drain/waste pipes installed in floor cavity |
| Interior finishing | Verify no ducts compressed or kinked by finishing work |
| Completion | Final blower door test |
| Completion | Commission MVHR, set airflows, balance dampers / AirHybrid panels |
| Completion | Commission ceiling heating/cooling, verify surface temperatures |
| Completion | Commission RO system, verify TDS/pH at every outlet |
| Completion | Commission leak detection, test auto shut-off valve |
| Completion | Elevator installed and tested |
| Completion | Datacenter racks, cooling, UPS commissioned (see 06-datacenter-spec Section 12) |
| Completion | Structured cabling (fiber + Cat6a) tested and certified |
| Completion | Commission sensors, verify readings, connect to Home Assistant |
### 9.2 Commissioning Verification
@@ -263,12 +296,12 @@ If the house includes an attached garage:
## 10. Timeline Integration
| Baufritz Phase | Air System Action | Lindner Floor/Ceiling Action |
|----------------|-------------------|------------------------------|
| Initial design | Specify MVHR unit, technical room size, duct routing | Confirm raised floor + Plafotherm, specify cavity heights and floor-to-floor height (≥ 3000 mm) |
| Detailed planning | Approve duct routing on drawings, specify all penetrations | Lindner layout drawings for floor and ceiling, coordinate with MVHR plan |
| Pre-fabrication | Confirm radon membrane spec, duct void dimensions | Verify subfloor level tolerance and ceiling anchor points in prefab panels |
| Factory build | Verify duct voids in prefab wall/floor panels | No impact (Lindner systems installed on-site) |
| On-site assembly | Supervise duct installation, first blower door test | Install ceiling system, then floor pedestals and cavity services |
| Finishing | Sensor wiring, diffuser installation | Parquet tile installation, floor and ceiling commissioning |
| Handover | Full commissioning, sensor calibration, HA setup | Heating/cooling commissioning, AirHybrid airflow verification |
| Baufritz Phase | Air System Action | Lindner Floor/Ceiling Action | Water System Action | Cellar/Datacenter Action |
|----------------|-------------------|------------------------------|---------------------|--------------------------|
| Initial design | Specify MVHR unit, technical room size (8-10 m2), duct routing | Confirm raised floor + Plafotherm, specify cavity heights and floor-to-floor height (≥ 3000 mm) | Confirm POE RO location, municipal water entry, reject water drain | Cellar dimensions, elevator shaft location, main electrical sizing (3x80A) |
| Detailed planning | Approve duct routing on drawings, specify all penetrations | Lindner layout drawings for floor and ceiling, coordinate with MVHR plan | 316L pipe routing in ceiling void, riser locations, fixture drop-down points | Cellar structural drawings, elevator spec, cooling condenser location |
| Pre-fabrication | Confirm radon membrane spec, duct void dimensions | Verify subfloor level tolerance and ceiling anchor points in prefab panels | Confirm ceiling void can accommodate water pipes alongside MVHR and Plafotherm | **Cellar construction begins** (concrete, waterproofing, elevator shaft) |
| Factory build | Verify duct voids in prefab wall/floor panels | No impact (Lindner systems installed on-site) | No impact (water system installed on-site) | Cellar complete, slab cured, ready for Baufritz erection |
| On-site assembly | Supervise duct installation, first blower door test | Install ceiling suspension, route Plafotherm pipes | Install 316L supply mains in ceiling void (same phase as Plafotherm) | Elevator installed, main distribution board installed |
| Finishing | Sensor wiring, diffuser installation | Plafotherm panels, floor pedestals, parquet tiles | Pressure-test pipes, install drain/waste in floor cavity, connect fixtures | Datacenter fit-out: racks, cooling, cabling, UPS |
| Handover | Full commissioning, sensor calibration, HA setup | Heating/cooling commissioning, AirHybrid airflow verification | RO commissioning, TDS/pH verification, leak detection test | Cooling commissioning, fire detection test, HA integration |