Structural Construction Using Wide Flange steel (Baja WF)

Structural Construction Using Baja WF for Villa and Commercial Projects in Lombok

Wide Flange steel (Baja WF) is commonly used in villa, resort, and commercial projects in Lombok when the design requires high structural capacity, faster installation, and predictable performance. Unlike timber or light steel, WF sections provide reliable load-bearing strength and are often selected for multi‑storey areas, large spans, and zones exposed to high winds or coastal conditions. This article outlines how WF structures are applied in practice, the materials typically involved, and indicative pricing from our internal references.

1. Why Baja WF Is Used in Lombok Projects

WF sections provide consistent structural properties, which is important in regions with:

• Variable soil conditions

Structural loads can be accurately transferred to foundations when WF beams and columns are used with engineered connections.

• High wind exposure

Coastal and hilltop plots in Lombok require rigid frames. WF systems allow predictable lateral resistance when paired with bracing.

• Accelerated construction schedules

Villas and commercial buildings constructed with WF components can be assembled faster than traditional reinforced concrete frames.

• Permit and structural documentation requirements

WF designs integrate cleanly with structural calculations required for PBG approval and SLF certification.

2. Typical WF Components Used in Villa Construction

Although WF projects vary, a standard frame includes:

• WF Columns

Primary vertical supports, often used for open-plan villa layouts.

• WF Beams

Used for large spans, roofs with heavy loads, or mezzanine floors.

• Baseplates and Anchor Bolts

Connect WF columns to concrete footings.

• Bracing Members

Improve stability against wind loads.

• Secondary Framing

Such as lightweight steel battens or C‑channels attached to WF beams.

3. Related Material Pricing 

Below are representative prices from your material dataset that are commonly involved in WF structural works. These are not WF beam prices themselves (not listed in your file), but associated materials used in WF installations.

**Concrete and Foundations**

| Item | Unit | Price (Rp) |

| ------------------------------ | ---- | ------------: |

| Ready Mix Concrete | m³ | 1,232,435 |

| Batu Belah / Pondasi | m³ | 259,460 |

| Rebar Ulir (Reinforcing Steel) | kg | 17,255 |

| Rebar Polos | kg | 16,217 |

| Besi Ø12 mm (per pcs) | pcs | 166,914 |

| Formwork Timber Beam | m³ | 1,704,344 |

Purpose: Footings, pedestals, tie beams, and column bases for WF installation.

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**Bolts, Anchors, and Connection Hardware**

| Item | Unit | Price (Rp) |

| -------------------------- | ---- | ----------------: |

| Angker Ø22 mm × 50 cm | pcs | 16,035 |

| Angker Ø16 mm × 40 cm | pcs | 34,808 |

| Baut Kuda‑kuda Baja Ø17 mm | pcs | 23,467–52,146 |

| Dynabolt 12 mm | pcs | 7,500 |

Purpose: Anchor WF columns to concrete footings, secure baseplates, and lock bracing members.

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**Secondary Steel and Roof Interface**

Even WF structures need light steel components for the roofing system and ceiling support.

| Item | Unit | Price (Rp) |

| -------------------------------- | ----- | ----------: |

| Lightweight Steel (Taso 0.70 mm) | bar | 127,135 |

| Roof Batten (Reng 0.40/0.45) | pcs | 45,629 |

| Spandek 0.35 × 1 m | m | 58,665 |

| Ridge “Ujung” | pcs | 57,361 |

| Ridge Spandek (3 m) | sheet | 90,000 |

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**Plumbing and MEP Integration**

WF buildings still integrate conventional plumbing/electrical systems.

| Item | Unit | Price (Rp) |

| ----------------------- | ---- | ------------: |

| PVC AW Ø4" | m | 389,000 |

| PVC AW Ø3" | m | 234,000 |

| Floor Drain ex. YUTA | pcs | 23,267 |

| Electrical Conduit 5/8" | bar | 35,000 |

| Panel Tipe PLN | pcs | 1,890,291 |

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4. How WF Structures Are Installed in Practice

**A. Foundation Preparation**

• Soil investigation (Sondir) determines footing depth.
• Concrete pedestals are cast with embedded anchor bolts.
• Baseplates are installed and leveled precisely.

**B. Steel Erection**

• WF columns are lifted into place using manual hoists or mobile cranes depending on access.
• Beams are connected with bolts or welded joints per engineering drawings.
• Bracing is installed to resist lateral loads.

**C. Integration With Roof and Floors**

• Lightweight steel battens are attached to WF beams for roofing.
• Spandek or multiroof panels are installed with SDS fasteners.
• Ceiling systems, piping, and electrical conduits are fixed beneath the WF framework.

**D. Inspection and Compliance**

• Welding, bolt torque, and alignment checks are recorded for PBG inspectors.
• As‑built drawings reflect final elevations and connection details.

5. Advantages for Foreign Investors

• Predictable structural performance backed by engineering calculations.
• Reduced construction time, especially valuable for resort projects.
• Compatible with large openings (sliding doors, glass façades).
• Less shrinkage and cracking compared to all‑concrete structures.
• Simplified maintenance since WF members can be inspected visually.

Pricing Disclaimer

All material prices listed are indicative as of 2025 and based on internal procurement references. Actual costs in Lombok vary by location, supplier stock, transport from Java/Bali, and weather-related access. Remote or coastal sites may experience higher prices. Always verify updated prices and specifications before tender or procurement.

Summary

WF steel construction provides a stable and efficient structural option for villas and commercial buildings in Lombok. When combined with reliable foundation work, proper anchoring, and well‑documented installation, WF systems support compliance for PBG and SLF approvals while delivering long‑term performance in Lombok’s coastal environment.