house-spec/specs/04-flooring-ceiling-spec.md

# Flooring & Ceiling Specification — Lindner Raised Floor + Radiant Ceiling

## 1. Design Philosophy

This house uses a **dual Lindner system**: a raised floor (Doppelboden) below and radiant ceiling panels above. Together they replace traditional screed, radiators, and conventional ceiling finishes with a fully integrated, modular, dry-construction approach.

- **Raised floor** = services distribution layer. The cavity beneath the panels routes MVHR branch ducts, KNX bus cable, Cat6 data, electrical wiring, and plumbing — all accessible by lifting individual tiles.
- **Radiant ceiling** = heating, cooling, and ventilation air distribution. Lindner Plafotherm AirHybrid panels combine radiant water-based climate control with MVHR supply air distribution through ceiling perforations.
- **No wet trades**: Both systems are dry-installed — no screed, no drying time. Ideal for Baufritz timber-frame prefabrication.
- **Lifetime maintainability**: Every component is demountable. A pipe leak, a rewiring job, or a technology upgrade requires lifting tiles or removing ceiling panels — not demolition.

**The raised floor is not a cosmetic choice. It is a services distribution layer that provides lifetime maintainability. The radiant ceiling is not a luxury — it is the most responsive, furniture-independent, and efficient way to heat and cool a sealed, high-performance home.**

---

## 2. Room Height Budget

Both systems consume vertical space. The usable clear room height must be carefully planned with Baufritz at the structural design stage.

```mermaid
flowchart TD
    A["Structural Ceiling Deck\n~200 mm timber construction"] --> B
    B["Plafotherm Suspension\n30-70 mm substructure"] --> C
    C["Plafotherm Ceiling Panel\n30-50 mm radiant panel + pipes"] --> D
    D["USABLE ROOM HEIGHT\nTarget: 2500 mm minimum"] --> E
    E["WOODline Parquet\n4 mm solid wood"] --> F
    F["CaSO4 Floor Panel\n40-44 mm calcium sulphate"] --> G
    G["Services Cavity\n80-200 mm depending on floor"] --> H
    H["Floor Pedestals\nadjustable steel"] --> I
    I["Structural Floor Deck / Slab\n+ Radon membrane below"]

    style D fill:#1a5e1a,color:#fff,stroke:#0d3d0d
    style C fill:#8b0000,color:#fff
    style F fill:#1a3d5e,color:#fff
```

### 2.1 Height Calculation

| Layer | Ground Floor | Upper Floor | Notes |
|-------|-------------|-------------|-------|
| Structural floor-to-floor height | **3000-3200 mm** | **3000-3200 mm** | Baufritz to specify; must be ≥ 3000 mm |
| Structural deck (floor + ceiling) | -200 mm | -200 mm | Timber joists + sheathing |
| Ceiling system (Plafotherm + suspension) | -80 to -120 mm | -80 to -120 mm | Depends on product variant |
| Raised floor (cavity + panel + parquet) | -200 to -250 mm | -130 to -170 mm | Ground floor deeper for MVHR ducts |
| **Usable clear height** | **2430-2720 mm** | **2510-2790 mm** | Target ≥ 2500 mm |

### 2.2 Recommendation

**Baufritz structural floor-to-floor height must be ≥ 3000 mm**, preferably 3100-3200 mm, to guarantee ≥ 2500 mm usable room height on all floors after both Lindner systems are installed. This must be specified at the initial design stage — it cannot be changed after prefabrication begins.

---

## 3. Raised Floor — Lindner NORTEC Doppelboden

### 3.1 System Overview

Since heating is provided by the ceiling system, the raised floor uses **standard NORTEC Doppelboden panels** (not the "comfort" variant with integrated heating pipes). The Doppelboden (raised floor) system uses individually removable modular panels on height-adjustable pedestals — any panel can be lifted at any time for full access to the services cavity below. This is the key advantage over Hohlboden (hollow floor) systems, which form a continuous layer with limited access.

| Parameter | Value |
|-----------|-------|
| Product | Lindner NORTEC (Doppelboden / raised access floor) |
| Panel material | Fibre-reinforced calcium sulphate (CaSO4), up to 100% recycled |
| Panel dimensions | 600 x 600 mm |
| Panel thickness | 40-44 mm |
| Load class | 3-6 (per EN 13213) |
| Point load capacity | 3-7 kN (depending on class) |
| Fire class | A1 non-combustible (EN 13501-1) |
| Fire resistance | F30 (DIN 4102-2) |
| Weight | 41-55 kg/m2 |
| Sustainability | Cradle to Cradle Silver certified |

### 3.2 Pedestal System

| Parameter | Value |
|-----------|-------|
| Type | Type S or Type SWH120 |
| Material | Galvanized steel, chrome(VI)-free, zinc-whisker-free |
| Height adjustment | Infinitely adjustable, 40-2000 mm |
| Grid spacing | 600 x 600 mm |
| Anchoring | **Adhesive bonding only** — no mechanical fixings through radon membrane |
| Approximate quantity | ~8 pedestals per m2 |

### 3.3 Cavity Height Selection

| Zone | Cavity Height | Services Routed | Justification |
|------|--------------|-----------------|---------------|
| Ground floor living areas | 200 mm | MVHR branch ducts (125-160 mm) + KNX + electrical | Must accommodate duct diameter + clearance |
| Ground floor kitchen | 200 mm | MVHR exhaust branch + electrical + plumbing | Kitchen exhaust duct routing |
| Ground floor office | 150-200 mm | MVHR branch + KNX + Cat6 + electrical | Data-heavy zone |
| Upper floor bedrooms | 100-120 mm | KNX + Cat6 + electrical only | No MVHR ducts (routed in ceiling void) |
| Upper floor bathrooms | 100-120 mm | Electrical + plumbing waste | Waterproof membrane above panels |
| Technical room | 150 mm | Electrical + plumbing connections | Higher load class (Class 5) |

### 3.4 Surface Finish — NORTEC WOODline Parquet

| Parameter | Value |
|-----------|-------|
| Product | Lindner NORTEC WOODline |
| Material | Solid wood parquet, factory-bonded to panel |
| Dimensions | 600 x 600 x 4 mm |
| Wood species | Oak, Smoked Oak, Ash Eco, Bamboo Light, Steamed Bamboo |
| Design patterns | 16+ patterns (herringbone, mosaic, 2-strip, geometric, etc.) |
| Certification | PEFC certified |
| Joint type | Near-invisible joints with color-matched edge bands |
| Edge protection | Edge bands extend to parquet top — prevents moisture penetration |

#### Surface Treatment Options

| Treatment | Description | Slip Resistance | Best For |
|-----------|-------------|-----------------|----------|
| Lacquered | 6-layer UV curing, matte finish | R9, Class 6 durability | Living areas, kitchen, hallways |
| Oiled | Hard wax oil, 2 applications, matte | R9 | Bedrooms, office |
| Sanded | Pre-sanded, requires on-site coating | N/A | **Not recommended** — on-site coating introduces VOCs into sealed envelope |

**Recommendation**: Lacquered Oak for main living areas (durability, low maintenance). Oiled Oak for bedrooms (natural feel). **Avoid sanded finish** — on-site coating releases VOCs that conflict with the air quality targets in 01-air-system-spec Section 8 (formaldehyde target < 30 ug/m3).

---

## 4. Ceiling Heating/Cooling — Lindner Plafotherm

### 4.1 Product Selection

| Product | Type | Key Feature | Residential Suitability |
|---------|------|-------------|------------------------|
| **Plafotherm AirHybrid** | Hybrid radiant + ventilation | Combines heating/cooling with MVHR supply air distribution | **Recommended** — eliminates separate diffusers |
| Plafotherm GK HEKDA | Plasterboard radiant ceiling | Seamless plastered finish, residential aesthetic | Good alternative for rooms without MVHR supply |
| Plafotherm E 210 | Hook-on metal ceiling | Clean metal panel look, butt joints | Modern aesthetic option |
| Plafotherm B 100 | Post cap metal ceiling | Cost-effective, visible linear joints | Budget option |

**Primary recommendation: Plafotherm AirHybrid** for all rooms with MVHR supply air. Plafotherm GK HEKDA for bathrooms and rooms where a seamless plastered ceiling is preferred.

### 4.2 Heating/Cooling Performance

| Parameter | Standard Radiant | AirHybrid (2x air exchange) | AirHybrid (6x air exchange) |
|-----------|-----------------|---------------------------|---------------------------|
| Heating output (at 15K delta-T) | 123 W/m2 | 149 W/m2 | 161 W/m2 |
| Cooling output (at 10K delta-T) | - | 137 W/m2 | 159 W/m2 |
| Standard (EN 14037 / EN 14240) | EN 14037 | EN 14037 / EN 14240 | EN 14037 / EN 14240 |

**For context**: A Passivhaus-level Baufritz home has a peak heating demand of approximately 10-15 W/m2. Even the standard radiant panel at 123 W/m2 provides **8-12x the required capacity**. This means only a fraction of the ceiling area needs to be active at any time, or flow temperatures can be very low (maximizing heat pump COP).

### 4.3 Pipe Specifications

| Parameter | Value |
|-----------|-------|
| Connection hoses | PlafoTube PK |
| Nominal width | DN 13 |
| Press coupling | 12 mm brass fittings |
| Pressure rating | 16 bar |
| Flow temperature (heating) | 30-35 C design (low-temp for heat pump efficiency) |
| Flow temperature (cooling) | 16-18 C (must stay above dewpoint) |

### 4.4 System Depth

| Component | Depth |
|-----------|-------|
| Panel (Plafotherm B/E) | 30-50 mm |
| Suspension substructure | 30-70 mm |
| **Total system depth** | **60-120 mm** |

The exact depth depends on the chosen product variant and must be confirmed with Lindner for the specific ceiling type. The AirHybrid variant may require slightly more depth for the ventilation hood on the rear side.

### 4.5 Advantages Over Floor Heating

| Aspect | Ceiling Heating | Floor Heating |
|--------|----------------|---------------|
| Response time | Fast — low thermal inertia | Slow — 5+ hours typical |
| Heat output | ~175 W/m2 max | ~65 W/m2 limited by covering |
| Furniture impact | Zero — completely unobstructed | Significant — rugs and furniture reduce output |
| Floor covering freedom | Any covering, any time | Covering thermal resistance limits options |
| Dust circulation | None — radiant, no convection | Minimal but present |
| Cooling capability | Excellent — natural convection aids cooling from above | Limited — cool air at floor stays at floor |
| Relative cost | ~50% of floor system cost | Baseline |

---

## 5. MVHR Integration via AirHybrid Ceiling

### 5.1 Supply Air Distribution

The Plafotherm AirHybrid integrates MVHR supply air distribution directly into the ceiling panels:

- Ventilation hood mounted on the rear (upper) side of the panel — invisible from below
- Supply air distributed through **panel perforations and induction outlets**
- Even air distribution without perceptible drafts
- **Replaces conventional wall/ceiling diffusers** in rooms where AirHybrid is installed

This means the MVHR supply air is tempered by the radiant ceiling before entering the room — pre-heated in winter, pre-cooled in summer. No cold-air draft sensation.

### 5.2 Revised Air System Architecture

```mermaid
flowchart TD
    MVHR["MVHR Unit\nH13 HEPA filtered supply"] --> TRUNK["Main Supply Trunk\nin ceiling void"]
    TRUNK --> AH1["AirHybrid Panels\nLiving Room"]
    TRUNK --> AH2["AirHybrid Panels\nBedrooms"]
    TRUNK --> AH3["AirHybrid Panels\nOffice"]
    TRUNK --> BATH["Conventional Diffuser\nBathrooms"]

    HP["Heat Pump"] --> MAN["Heating/Cooling Manifold"]
    MAN --> P1["Plafotherm Pipes\nLiving Room"]
    MAN --> P2["Plafotherm Pipes\nBedrooms"]
    MAN --> P3["Plafotherm Pipes\nOffice"]
    MAN --> P4["Plafotherm Pipes\nBathrooms"]

    EX1["Exhaust Grilles\nall rooms"] --> EXDUCT["Exhaust Ducts\nin floor cavity or walls"]
    EXDUCT --> MVHR

    style MVHR fill:#1a3d5e,color:#fff
    style HP fill:#8b0000,color:#fff
    style AH1 fill:#1a5e5e,color:#fff
    style AH2 fill:#1a5e5e,color:#fff
    style AH3 fill:#1a5e5e,color:#fff
```

### 5.3 Humidity Control for Cooling Mode

**Critical requirement**: When the ceiling operates in cooling mode, the ceiling surface temperature drops. If it falls below the room air dewpoint, condensation forms on the panels.

- The MVHR system must control absolute humidity of supply air (see 01-air-system-spec Section 5, steam humidifier / dehumidification)
- Ceiling surface temperature sensors must be installed (see Section 9.3)
- Automated interlock: if ceiling surface temperature approaches dewpoint within 2K, reduce cooling water flow or activate dehumidification
- Cooling water flow temperature must never go below 16 C without verified dewpoint margin

### 5.4 MVHR Duct Routing Revision

With AirHybrid ceiling integration, the duct routing changes:

| Duct Function | Routing Location | Notes |
|--------------|-----------------|-------|
| Main supply trunk | Ceiling void (alongside Plafotherm pipes) | Shared space — coordinate routing |
| Supply branches | Via AirHybrid ceiling panels | No separate diffusers needed |
| Main exhaust trunk | Ceiling void or floor cavity | Depends on building layout |
| Exhaust branches | Floor cavity (ground floor) or wall ducts | Exhaust grilles at low level preferred |
| Kitchen exhaust | Dedicated separate stack | Never through MVHR — unchanged |

---

## 6. Floor Cavity Services Integration

### 6.1 Ground Floor

The ground floor raised floor cavity (200 mm) accommodates:

- **MVHR exhaust branch ducts** (125-160 mm diameter, rigid steel/aluminum per 01-air-system-spec Section 6.2)
- **KNX bus cable** to all room zones
- **Cat6a shielded data** to all rooms
- **Electrical wiring** (standard NYM cable)
- **Plumbing** (where floor-level connections are needed)

**Constraints**:
- Ducts must be rigid steel/aluminum — no semi-rigid flex except final 0.5 m
- All duct joints mastic-sealed
- Minimum 20 mm clearance between ducts and other services
- No main trunk ducts in the floor cavity — trunk stays in ceiling void. Only branch ducts

### 6.2 Upper Floor

The upper floor cavity (100-120 mm) accommodates only:
- KNX, Cat6, and electrical wiring
- MVHR ducts route in the ceiling void between floors (same void as Plafotherm)

### 6.3 Airtightness

The floor cavity must not compromise the house's +3 to +5 Pa positive pressure (see 01-air-system-spec Section 7):

- **Panel joints**: sealed with Lindner's standard gasket system
- **Perimeter**: sealed to walls with compressible airtight tape
- **Service penetrations**: all pipe/cable entries through panels sealed with airtight grommets
- **Cavity is NOT ventilated**: it is a sealed, conditioned space
- **Ducts are individual sealed runs**: the cavity itself is not used as an air plenum

---

## 7. Structural and Load Considerations

### 7.1 Floor Load Classes

| Zone | Minimum Load Class | Point Load | Justification |
|------|-------------------|------------|---------------|
| Living areas | Class 3 | 3 kN | Residential furniture, foot traffic |
| Kitchen | Class 4 | 4 kN | Heavy appliances |
| Technical room | Class 5 | 5 kN | MVHR unit, humidifier, control cabinets |
| Bathrooms | Class 3 | 3 kN | With waterproofing layer above panels |
| Hallways / stairs landing | Class 3 | 3 kN | Standard residential |

### 7.2 Ceiling Suspension Load

- Plafotherm system weight: approximately 14-16 kg/m2 (without fixtures)
- Baufritz ceiling deck (timber joists + sheathing) must support this additional suspended load
- Verify with Baufritz structural engineer — this is within normal limits for timber-frame construction

### 7.3 Combined Dead Load

| Component | Load (kg/m2) |
|-----------|-------------|
| Raised floor (panels + pedestals) | 41-55 |
| Parquet finish | ~4 |
| Ceiling system (Plafotherm + suspension) | 14-16 |
| **Total additional dead load per floor** | **59-75** |

Baufritz structural engineer must verify that the timber floor deck supports this additional dead load plus the design live load (1.5-2.0 kN/m2 residential per DIN EN 1991-1-1).

### 7.4 Bathroom Considerations

- Calcium sulphate panels are **not inherently waterproof**
- Bathrooms require a **waterproof membrane above the panels** (liquid-applied or sheet membrane)
- Confirm with Lindner whether moisture-resistant panel variants are available
- Pedestal corrosion: galvanized steel pedestals tolerate occasional moisture but are not rated for continuous wet conditions
- Floor drains penetrate through panels — connections sealed with waterproof flanges
- Ceiling panels in bathrooms: use moisture-resistant Plafotherm variant or Plafotherm GK with moisture-rated plasterboard

### 7.5 Pedestal Anchoring

- Pedestals bonded to structural subfloor with **adhesive only**
- **No mechanical fixings through the radon membrane** (see 03-baufritz-coordination-spec Section 4.2)
- Verify adhesive compatibility with radon membrane material (HDPE or bituminous)
- Adhesive must maintain bond under the combined dead load + live load

---

## 8. Acoustic Performance

### 8.1 Floor Acoustics

| Parameter | Target |
|-----------|--------|
| Impact sound improvement (delta Lw) | >= 20 dB |
| Airborne sound insulation (Rw, between floors) | >= 50 dB |

- Calcium sulphate panels on rubber-damped pedestals provide acoustic decoupling from the structural floor
- Verify Lindner's acoustic data sheets for the specific pedestal type and cavity height
- Additional acoustic mat between pedestal base plate and subfloor if required to meet targets

### 8.2 Ceiling Acoustics

- Plafotherm panels provide additional acoustic absorption depending on panel type
- Plafotherm GK HEKDA (plasterboard) offers good mid-frequency absorption
- Metal panels (B/E series) may require acoustic fleece backing for absorption
- Verify weighted sound absorption coefficient (alpha-w) with Lindner

### 8.3 MVHR Noise in Shared Voids

- Ducts in ceiling void and floor cavity can transmit fan noise between rooms
- **Acoustic silencers required** at trunk-to-branch junctions and before each distribution point
- Target at all distribution points: **< 25 dB(A)** (same as 03-baufritz-coordination-spec Section 9.2)
- The AirHybrid panel perforations provide some natural sound attenuation — verify with Lindner acoustic data

---

## 9. Sensor Placement Considerations

### 9.1 Temperature and Humidity Sensors

With both a heated ceiling above and a raised floor below, the room air temperature gradient is different from conventional construction:

- **Mount sensors at 1.2-1.5 m wall height** — the midpoint of the room where occupants experience the air
- **Away from the heated ceiling**: ceiling surface may be 25-35 C — sensors near the ceiling would read high
- **Away from the raised floor surface**: floor will be at room temperature (no floor heating), but directly above floor diffusers could be cooler
- **Away from exterior walls**: radiant asymmetry near windows affects readings
- Cross-reference: 02-sensor-automation-spec Section 2.1

### 9.2 Floor Surface Temperature Sensor

If floor cooling is used in summer (optional — primary cooling is from ceiling):
- Embedded sensors in or on the parquet surface, 2-3 per zone
- Floor surface must not exceed 29 C (DIN EN 1264 comfort limit for habitable rooms) or drop below dewpoint in cooling mode

### 9.3 Ceiling Surface Temperature Sensor

**Critical for condensation prevention in cooling mode**:

- Embedded sensors on or in the Plafotherm panels, minimum 1 per zone
- Connected to KNX / Home Assistant
- Automated interlock: if ceiling surface temperature approaches room dewpoint within 2K, the system must either reduce cooling water flow or activate dehumidification
- Cross-reference: 02-sensor-automation-spec Section 5.1 (add condensation risk indicator to dashboard)

### 9.4 Radon Monitoring

- Room-level radon sensor on ground floor (per 02-sensor-automation-spec Section 2)
- **Additional**: one radon sensor with sampling port into the floor cavity itself — early warning of radon membrane breach
- If cavity radon levels rise while room levels remain normal, the membrane and cavity sealing are working; if room levels rise, investigate immediately

---

## 10. Heating/Cooling Control

### 10.1 Zone Control Architecture

| Component | Specification |
|-----------|--------------|
| Flow control | Thermal actuator on manifold, per room/zone |
| Manifold location | Technical room or dedicated riser closet |
| Control bus | KNX |
| Room input | Room thermostat (1.2-1.5 m) + ceiling surface temp sensor |
| Flow temperature (heating) | 30-35 C (outdoor-temperature compensated) |
| Flow temperature (cooling) | 16-18 C (dewpoint-guarded) |
| Return temperature | 25-28 C (heating), 18-20 C (cooling) |

### 10.2 Home Assistant Integration

- Ceiling heating/cooling zones visible on dashboard alongside air quality data
- Floor surface temperature displayed per zone (if floor cooling used)
- **Condensation risk indicator**: calculated from ceiling surface temp vs. room dewpoint
- Night mode: reduce ceiling temperature setpoint by 2 C (cross-ref 02-sensor-automation-spec Section 4.4)
- Summer cooling: activate when outdoor temp > 26 C and indoor temp > 24 C
- Interlock: dehumidification activates automatically when cooling mode is active

### 10.3 Condensation Prevention

```mermaid
flowchart TD
    MODE{"Operating Mode?"} -->|Heating| HEAT["Normal Heating\nFlow temp 30-35C"]
    MODE -->|Cooling| COOL["Cooling Active\nFlow temp 16-18C"]
    MODE -->|Off| OFF["Standby"]

    COOL --> DEW{"Ceiling Surface\nvs. Dewpoint?"}
    DEW -->|"> 3K margin"| OK["Safe - Continue Cooling"]
    DEW -->|"2-3K margin"| WARN["Warning\nReduce cooling flow"]
    DEW -->|"< 2K margin"| STOP["STOP Cooling\nActivate dehumidification\nAlert via Home Assistant"]

    style STOP fill:#8b0000,color:#fff
    style WARN fill:#4a4a00,color:#fff
    style OK fill:#1a5e1a,color:#fff
```

---

## 11. Installation Sequence and Baufritz Coordination

### 11.1 Pre-Installation Requirements

| Prerequisite | Detail |
|-------------|--------|
| Radon membrane | Installed, sealed, and tested at all penetrations |
| Structural subfloor | Level to +/- 2 mm per 2 m (Lindner pedestal tolerance) |
| Structural ceiling deck | Installed with suspension anchor points |
| Heating manifold | Location fixed, main pipe runs to floor/ceiling entry points |
| MVHR trunk duct | Installed in ceiling void, branch points identified |
| Electrical rough-in | Floor-level junction boxes and ceiling-level feeds planned |

### 11.2 Installation Sequence

```mermaid
flowchart TD
    A["1. Install ceiling suspension\nsubstructure from structural deck"] --> B
    B["2. Route Plafotherm heating pipes\nin ceiling void"] --> C
    C["3. Install Plafotherm panels\nonto suspension"] --> D
    D["4. Pressure-test ceiling circuit"] --> E
    E["5. Install floor pedestals\non adhesive pads"] --> F
    F["6. Route services in floor cavity\nMVHR ducts, KNX, Cat6, electrical"] --> G
    G["7. Pressure-test MVHR ducts\nin floor cavity"] --> H
    H["8. Install CaSO4 floor panels\non pedestals"] --> I
    I["9. Seal panel joints and perimeter"] --> J
    J["10. Install WOODline parquet tiles"] --> K
    K["11. Commission heating/cooling\nverify surface temperatures"] --> L
    L["12. Commission MVHR AirHybrid\nverify airflow at ceiling panels"]

    style D fill:#1a5e1a,color:#fff
    style G fill:#1a5e1a,color:#fff
    style K fill:#1a5e5e,color:#fff
    style L fill:#1a5e5e,color:#fff
```

**Key checkpoints** (green/teal in diagram):
- Step 4: Ceiling heating circuit pressure test — must pass before panels are closed
- Step 7: Floor cavity MVHR duct pressure test — must pass before panels are installed
- Step 11: Heating/cooling commissioning — verify surface temperatures per zone
- Step 12: MVHR AirHybrid commissioning — verify supply airflow through ceiling panels

### 11.3 Timeline Integration with Baufritz

| Baufritz Phase | Lindner Floor Action | Lindner Ceiling Action |
|----------------|---------------------|----------------------|
| Initial design | Confirm raised floor, specify cavity heights | Confirm Plafotherm variant, specify system depth |
| Detailed planning | Lindner layout drawings, coordinate with MVHR exhaust | Lindner layout drawings, coordinate with MVHR supply |
| Pre-fabrication | Verify subfloor level tolerance in prefab panels | Verify ceiling anchor points in prefab panels |
| Factory build | No impact (floor installed on-site) | No impact (ceiling installed on-site) |
| On-site assembly | After structure complete | After structure, before floor |
| Finishing | Parquet tile installation | Final panel fitting |
| Handover | Floor inspection, service access verification | Heating/cooling commissioning, AirHybrid airflow test |

### 11.4 Lindner Coordination

Both floor and ceiling are from the same supplier — coordinate as a single package:

- **Combined layout drawings**: floor panel grid, ceiling panel grid, and services routing in a single coordinated plan
- **Shared manifold design**: heating/cooling manifold serves ceiling circuits (and optionally floor circuits if future floor heating is desired)
- **Single procurement**: order floor and ceiling systems together — potential cost advantage and guaranteed compatibility
- **Lead time**: Lindner products are project-manufactured — typically **6-8 weeks** from order. Layout drawings must be finalized before ordering.

---

## 12. Cost and Material Quantities

### 12.1 Estimated Quantities (for ~175 m2 per floor)

| Item | Quantity (approx.) | Unit |
|------|-------------------|------|
| NORTEC Doppelboden panels | ~490 | 600x600 mm panels per floor |
| WOODline parquet tiles | ~490 | 600x600x4 mm tiles per floor |
| Pedestals (Type S/SWH120) | ~1,400 | Per floor (~8/m2) |
| Plafotherm ceiling panels | ~350-450 | Per floor (varies by panel size) |
| Ceiling suspension profiles | As per Lindner layout | Metres |
| PlafoTube heating pipe | ~1,200-1,800 m | Per floor (depends on coverage %) |
| Manifold stations | 1-2 per floor | |

### 12.2 Lead Times and Ordering

- Lindner products are **project-manufactured** — not off-the-shelf
- Lead time: typically **6-8 weeks** from confirmed order
- Layout drawings must be finalized and approved before ordering
- Panels are manufactured to the specific floor plan — changes after manufacturing are costly
- **Coordinate ordering with Baufritz on-site assembly schedule** — panels must arrive after structure is weathertight but before interior finishing begins