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Core field area: İstanbul Anatolian & Kocaeli corridor · Outside corridor by agreed quote
SS-TECH · Modular Cabin Sample SSR-2026-MOD-02 7 min read

Prefabricated House & Flat-Pack Cabin Technical Review Sample Report

See how SerSourcing evaluates a Turkish prefabricated building and flat-pack container cabin manufacturer (SS-TECH €790) across chassis steel thickness, corner castings, roof water-tightness details and 40' HC flat-pack bundle engineering.

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Founder Technical & Procurement Review Tariff & Scope Verified: 2026-11-02
Prepared by Celalettin YAĞMAHAN Civil Engineer
Reviewed by İdris YAĞMAHAN Architect

Reviewed for technical terminology, Turkish factory field reality and published EUR scope boundaries (not statutory engineering sign-off).

Active Corporate Specimen: SSR-2026-MOD-02 · Prefab Cabin Tech Report
Commission This Scope on WhatsApp
SerSourcing TECHNICAL SOURCING, FACTORY AUDIT & BUYING-OFFICE DIVISION
DOCUMENT CONTROL Page 1 / 2
Document Ref.
SSR-2026-MOD-02
Tariff / Scope
SS-TECH (€790 · Up to 6h On-Site + 10 Drawings)
Issue / Revision
Rev. 02 · 2026-11-02
Classification
SPECIMEN · NDA ANONYMIZED

TECHNICAL FACTORY & MOCK-UP REVIEW — FLAT-PACK MODULAR CABINS

Product Scope: 24 × Demountable 2.40 × 6.00 m Flat-Pack Site Office & Dormitory Cabins (6 Units per 40' HC Container)

ILLUSTRATIVE CORPORATE SPECIMEN (ZERO CLIENT DATA DISCLOSED): Client names, factory identities, heat/certificate numbers and commercial figures in this specimen are fictionalized to protect strict B2B NDA confidentiality. Scoped commercial/visual engineering record — not an accredited laboratory test certificate or statutory structural sign-off.

01 · ASSIGNMENT REGISTER & EXECUTIVE GATE SUMMARY

Commissioning Buyer Profile [REDACTED — Civil Infrastructure Contractor, Romania / EU]
Industrial Corridor & Travel Rule Pendik – Tuzla – Kocaeli Modular Corridor (Core Zone · €0 Local Travel)
Referenced Technical Standards EN 14509 Wall/Roof Panels · EN 1090 Chassis Weld · Buyer Cabin GA Rev.02
Verification Instruments & Basis Ultrasonic/Magnetic DFT Gauge, Digital Caliper, Tape Measure, Mock-Up Frame Check
Standard Tariff & Turnaround €790 (SS-TECH) · Target Delivery: 3 Business Days After Site Review
18 Points Technical Clauses Checked
13 Verified Direct Mock-Up & Line Checks
3 Reviewed Panel & Paint Specs Checked
2 Spec Gaps Pre-Contract Revisions
Executive Gate Recommendation: QUALIFIED WITH SPEC ADJUSTMENTS — 2 OPEN ITEMS

Factory operates dedicated chassis welding jigs, powder-coating oven and assembled cabin mock-up bay. However, standard export model uses 50 mm EPS wall panels and 1.50 mm cold-bent corner posts, whereas buyer tender requires 60 mm PIR B-s1,d0 panels and 2.50 mm corner posts with forklift pockets.

02 · SCOPED TECHNICAL OBSERVATIONS, MEASUREMENTS & COMPARISON MATRIX

Ref. Subsystem / Inspection Parameter Buyer Specification / Benchmark Recorded Field / Desk Evidence Evidence Basis Required Buyer / Supplier Gate Action
CHK-01 Bottom & Roof Chassis Cold-Formed C-Channel Gauge 2.00 mm galvanized C-chassis + 80×40 mm cross joists @ 625 mm c/c Mock-up chassis measured 1.98 mm coated gauge; cross-joist spacing verified at 620 mm centers on jig. Observed / Verified Compliant; lock joist spacing in signed shop drawing.
CHK-02 Corner Posts & Crane Lifting Castings 2.50 mm structural corner post + welded ISO-style top lifting lugs Standard showroom unit used 1.60 mm bent post; heavy export jig with 2.50 mm post + 6 mm lug plate seen on Line 2. Observed / Verified Specify "Heavy Export Chassis Rev.B" explicitly in Proforma.
CHK-03 Wall & Roof Insulated Sandwich Panel Core 60 mm PIR core (EN 13501-1 B-s1,d0), 0.50/0.45 mm RAL 9002 micro-rib External panel vendor declaration reviewed for 60 mm PIR; stockyard held mostly 50 mm EPS panels. Document Reviewed Require PIR batch order confirmation + core density check at SS-PRE.
CHK-04 Roof Perimeter Gutter & Downspout Integration Concealed galvanized perimeter gutter + 4 corner PVC downspouts + EPDM seals Inspected assembled unit: internal gutter folded cleanly, but butyl mastics at corner miters were hand-applied unevenly. Observed / Verified Add factory water-spray check + twin EPDM gasket strip to QC checklist.
CHK-05 Chassis Corrosion Protection & Oven Paint DFT Epoxy primer + polyurethane/electrostatic topcoat >= 90 µm total DFT 10-point DFT check on powder-coated roof frame averaged 104 µm (min 88 µm, max 122 µm). Observed / Verified Satisfactory; verify touch-up zinc-rich primer on weld zones.
CHK-06 40' HC Flat-Pack Transpack Height & Bolting Kit Max 645 mm packed bundle height (6 units / 40' HC) + full M12 bolt/foam kit Supplier stated 6 cabins load per 40' HC, but revised 60 mm PIR + thicker floor cement board raises pack to ~675 mm. Open / Hold Gate Recalculate bundle geometry (5 vs 6 units per 40' HC) before fixing freight budget.
Inspection & Sampling Basis

Scoped B2B visual field verification, random dimensional spot-sampling and documentary cross-check.

Metrology & Traceability

Field gauges zero-checked prior to measurement; heat/batch IDs cross-referenced against presented 3.1 MTCs.

Commercial Payment Gate Rule

Advance or balance wire release remains conditional upon closing all Open / Hold items logged on Sheet 2.

SerSourcing — Operated by CFY Mühendislik Mim. Dan. Yapı Malz. İnş. San. ve Tic. Ltd. Şti. · Maltepe, İstanbul SSR-2026-MOD-02 · Page 1 / 2
SerSourcing · CFY Mühendislik Mim. Dan. Yapı Malz. İnş. San. ve Tic. Ltd. Şti. CORPORATE ENGINEERING & PROCUREMENT DOSSIER — CONTINUATION SHEET
SSR-2026-MOD-02 Rev. 02 · 2026-11-02 Page 2 / 2

03 · CROSS-REFERENCED EVIDENCE & ANNEX REGISTER

PHOTO-A1 Logged in Dossier
Chassis Welding Jig & Powder-Coating Line (16 Photos)

Jig clamping geometry, corner lifting lug weld detail and oven exit racks.

MOCK-B2 Logged in Dossier
Assembled 2.4×6.0 m Cabin Mock-Up Inspection Sheet

Floor cement-board deflection feel, door frame squareness and roof gutter miter photos.

DOC-C3 Logged in Dossier
Sandwich Panel Fire-Class & Density Datasheet Review

Reviewed third-party panel manufacturer EN 14509 / B-s1,d0 declaration.

PACK-D4 Logged in Dossier
Flat-Pack Bundle Dimensional Verification Sketch

Stacking height buildup sheet comparing 50 mm EPS vs 60 mm PIR configuration.

04 · OPEN-ITEMS ACTION REGISTER BEFORE COMMERCIAL RELEASE

Item ID Open Technical / Commercial Point Action Owner Target Release Gate
OI-01 Confirm exact flat-pack bundle height (mm) with 60 mm PIR panels so 2-tier 40' HC door clearance (2,585 mm) is not exceeded. Supplier Engineering Before Freight Booking
OI-02 Replace standard 50 mm EPS line item on Proforma with 60 mm PIR (B-s1,d0) and 2.50 mm corner posts. Supplier / Buyer Before PO Signature
OI-03 Schedule Pre-shipment & Container Stuffing Supervision (SS-PRE + SS-LOAD) for first 40' HC lot. Buyer / SerSourcing Prior to Dispatch

05 · EVIDENCE CLASSIFICATION KEY & CORPORATE SCOPE GOVERNANCE

Observed / Verified

Directly witnessed, counted or measured on site/desk by SerSourcing within the agreed assignment window.

Document Reviewed

Recorded from supplier-submitted certificates, MTCs or drawings without assuming physical lot testing.

Supplier-Stated

Verbal or written manufacturer statement recorded transparently; requires independent verification.

Open / Hold Gate

Unresolved technical or commercial hold item recommended for closure prior to stage payment/dispatch.

Governance & Independence Standard: Issued under buyer-representation tariff SS-2026-11-V2. Zero undisclosed supplier commission. Goods contracts, product warranties, accredited EN ISO/IEC 17025 lab testing and statutory engineering sign-off remain with the respective contracting parties and appointed specialists.

06 · DOCUMENT REVISION LOG & CONTROLLED DISTRIBUTION REGISTER

Rev. Date Revision Status & QA Milestone Authorized Distribution & Archive Retention
Rev. 01 2026-10-30 Initial field / desk observation log, dimensional check sheet & annex index. Internal Engineering Desk QA Review (Maltepe HQ)
Rev. 02 2026-11-02 QA-verified corporate engineering dossier & executive gate recommendation. Commissioning Buyer (1× Encrypted PDF + Annex ZIP) · 5-Yr NDA Archive

07 · BUYER CONTRACT, PAYMENT & DISPATCH SAFEGUARD PROTOCOL

GATE-01 Proforma & Technical Specification Rider

Bind verified steel grade, coating mass, tolerances and export packing rules directly into the signed Proforma Invoice.

GATE-02 Lot-Specific Certificate & Export Pack

Verify batch-allocated EN 10204 3.1 MTC, CE DoP, packing list and draft A.TR/EUR.1 48h prior to balance wire.

GATE-03 Pre-Shipment & Loading Gate Witness

Confirm final piece count and dunnage via SS-PRE (€490) or SS-LOAD (€390) before high-security bolt seal closure.

GATE-04 Strict NDA & Zero-Commission Mandate

Issued exclusively for commissioning buyer internal governance; SerSourcing accepts zero supplier commission (0%).

Prepared By (Field / Desk Lead) Celalettin YAĞMAHAN Civil Engineer · Co-Founder
Maltepe, İstanbul · 2026-11-02
Technical Quality Review By İdris YAĞMAHAN Architect · Co-Founder
QA Control · SSR-2026-MOD-02
Corporate Verification Seal
Tariff SS-2026-11-V2 · MERSİS: 0209128951200001 · Tax ID: 2091289512 · sersourcing.com SSR-2026-MOD-02 · Page 2 / 2

What Goes Wrong in Flat-Pack Cabin Exports Without a Technical Review

Turkish modular cabin manufacturers build two very different product tiers: domestic economy site cabins (thin 1.4–1.5 mm cold-bent frames with 40–50 mm EPS foam) and heavy export flat-pack units (2.0–2.5 mm structural frames, PIR or rockwool cores, and crane-rated corner castings).

A Technical Factory Review (SS-TECH €790) audits the physical welding jigs, paint micron thickness, roof gutter waterproofing, and exact flat-pack bundle height so 6-unit container loading plans do not fail on loading day.

  • Verifies whether upgrading wall/roof insulation thickness alters the 6-cabin-per-40' HC stacking geometry.
  • Checks floor board composition (16–18 mm fibercement Betopan vs moisture-sensitive OSB/chipboard) and vinyl covering.
  • Documents corner post lifting lug welds, paint DFT readings, and spare gasket/fastener box completeness.
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Clear Boundaries & Scope Answers

Frequently Asked Questions

In flat-pack modular cabins, wall panels are stacked horizontally inside each transpack sandwich. Adding 10 mm per panel across 10–12 wall/roof panels can add 60–100 mm to each bundle, potentially exceeding the 2,585 mm 40' HC door header when stacked two-high.

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