LOD 400 Fabrication & Shop Drawing BIM: CNC Outputs, Spools & Fee Guide

LOD 400 Fabrication BIM bridges the final mile between technical design and factory CNC machines—modeling every gusset plate, high-strength bolt grade, weld bevel, Victaulic/flanged pipe spool, ductwork Pittsburgh seam, and curtain-wall extrusion cut length.

Engineered to LOD 400 precision across a reference benchmark of 3,000 – 40,000 m² under ISO 19650 · AIA LOD 400 · EN 1090 EXC2/EXC3, this canonical specification unifies spatial design, multidisciplinary clash resolution, and 5D cost certainty prior to site mobilization.

Structural Grid & Modular Alignment: Sub-millimeter fabrication datum accounting for thermal expansion joints, erection shimming tolerances (±2 mm), and crane lifting sequences.

Primary column grids, facade mullion subdivisions, and subterranean parking geometry are locked onto a unified datum—eliminating non-standard off-cuts and costly site framing adjustments.

Spatial Program & Net-to-Gross Efficiency: Zone-by-zone and floor-by-floor assembly work packages structured around erection crane reach and off-site modular skids.

Live parametric Revit area schedules track net usable/leasable floor area against vertical cores, MEP plantrooms, and envelope wall thickness at every design iteration.

Vertical Cores, Logistics & Life-Safety Egress: Rigging paths, plantroom equipment haul-in routes, and modular corridor rack installation clearances verified in 4D sequence.

Travel distances, pressurized stair cores, ADA/accessible routing, and heavy service/loading dock swept-path geometry are validated against NFPA, EN, and local building regulations.

Subsurface Utilities, Drainage & Wet Shafts: Pre-sloped prefabricated drainage trees and cast-in puddle flanges scheduled with exact invert coordinates and part numbers.

Gravity stormwater and foul drainage stacks are modeled with true 1.5%–2.0% invert slopes, locking structural beam web penetrations and acoustic riser sleeves before rebar detailing.

Domestic Plumbing, NFPA/EN Sprinkler & Hydronics: Isometric pipework spool sheets detailing cut pipe lengths, grooved/welded fittings, hanger rod cut-lists, and hydrotest zones.

Wet/dry sprinkler grids, fire hose cabinets, booster pump skids, and hydronic manifolds are spatially coordinated above ceiling plenums without compromising architectural clear heights.

HVAC Routing, Acoustics & Zero-Clash Verification: SMACNA/DW144 sheet-metal duct piece numbering, flange-to-flange spool lengths, and acoustic attenuator rigging brackets.

Automated Navisworks and Solibri rule-sets enforce ±3 mm hard-clash tolerances and 25–50 mm insulation/maintenance clearance zones, closing 100% of BCF issues prior to tender issue.

Structural Framing & Seismic Engineering: EN 1090 EXC2/EXC3 steel part & assembly drawings, bolt torque lists (8.8 / 10.9 HV), CNC DSTV (.NC1) plate/profile files, and rebar bar-bending schedules (BBS).

Inter-story seismic drift ratios, ductile steel moment/braced connections, foundation punching shear, and secondary facade subframes are signed off by our senior structural engineering partners.

Building Envelope & Hygrothermal Physics: Unitized facade panel machining tickets, silicone bite calculations, EPDM gasket profiles, and anodized bracket shop tickets.

2D/3D thermal-bridge condensation risk is audited per EN ISO 6946, pairing Class A1 mineral-wool insulation, vapor-permeable membranes, and slotted seismic facade brackets at 1:5 shop detail scale.

Georeferenced Masterplan & ISO 19650 CDE: Barcode/QR-ready element GUID tracking inside ISO 19650 CDE linking factory QC inspection to on-site installation.

All discipline models share true survey coordinates (UTM / National Grid) and progress through ISO 19650 WIP → Shared → Published gates inside the Common Data Environment.

Native BIM & Construction Documentation Package: LOD 400 .RVT / Tekla models, .NC1 / .DXF laser & roll-forming files, MEP spool PDFs, rebar BBS schedules, and erection manuals.

Clients receive unlocked native .RVT · Tekla .IFC · CNC DSTV/NC1 · Spool & Shop .DWG source files, plotted PDF/DWG construction sets, and signed zero-clash audit certificates.

5D Quantity Take-Off (BoQ) & Indicative Studio Fee: The indicative engineering & BIM fee band for this reference scope is $32,000 – $58,000 (for 10,000 m² ref.) (with indicative construction CAPEX benchmark at $6.5M – $11.5M Construction Ref.). Locks procurement quantities to ±0.5% accuracy, slashing steel/MEP fabrication waste and cutting site installation labor by up to 35%.

DfMA Prefabrication & Export Execution Pathways: Directly compatible with SerBuild CNC roll-forming/structural lines and 40HC export crating schedules.

Clients may tender the open BIM package to any local contractor or leverage our integrated group factories (SerBuild steel structures, SerMimar İskele EN 12810 scaffolding, SerMimar Şömine hearths, and SerSourcing 40HC consolidation).

International Codes, Sustainability & Compliance: EN 1090-2 steel execution, SMACNA / DW144 ductwork, BS 8666 rebar detailing, and AIA G202 LOD 400.

Structured directly for LEED / BREEAM / RE2020 energy modeling, UK Building Safety Act Golden Thread compliance, Eurocode National Annexes, and institutional lender due diligence.