non penetrative roofing

High-Performance Concealed-Fix, 100% Leak-Proof Metal Roofing RK Engineering And Contractor (RKEC) delivers the ZIPZAC® Standing Seam Roofing System, an advanced concealed-fix industrial metal roofing and cladding solution engineered for demanding environments. Designed using 360-degree double-lock mechanical seaming, ZIPZAC® creates a continuous, weather-tight building envelope completely free of exposed through-fasteners. This ensures total protection against roof leakage, structural corrosion, and extreme weather across industrial, commercial, and infrastructure developments. Unlike conventional screw-down sheets—where fastener holes expand and loosen under daily temperature swings—ZIPZAC® utilizes an internal sliding clip mechanism. These concealed clips allow panels to expand and contract smoothly across seasonal thermal cycles without stressing joints or fasteners. The result is a clean architectural finish, proven resistance to severe wind uplift, and an extended, low-maintenance service life. Manufactured from Galvalume (AZ150/AZ200), Pre-Painted Galvalume (PPGL), and architectural aluminium alloys, ZIPZAC® panels can be roll-formed on-site in unbroken lengths over 60 meters, eliminating transverse end laps. Whether designed for low-pitch roofs (down to 1.5°), smooth curves, or complex architectural silhouettes, ZIPZAC® provides total design freedom. Centered in Pune and Chakan MIDC, RKEC delivers complete single-source execution from purlin survey to robotic seaming and water testing. Core Engineering Advantages: • 100% Penetration-Free Integrity: Zero external screws or holes; eliminates water ingress. • Thermal Expansion Accommodation: Sliding clips allow natural movement across wide temperature swings. • Zero End-Laps with Site Roll-Forming: Continuous ridge-to-eave panels eliminate joint failures. • High Wind Uplift Resistance: 360° mechanical double-lock creates a unified, storm-resistant diaphragm. • Low-Pitch Capability: Functions reliably down to 1.5° (1:40 slope), maximizing internal clear height. • Acoustic & Thermal Performance: Integrates smoothly into double-skin insulated assemblies (Rockwool/Glasswool). Technical Specifications: • Profiles: ZIPZAC 400 (400 mm cover, 65 mm seam) | ZIPZAC 430 (430 mm cover, 65 mm seam) • Raw Materials: Galvalume (AZ150/AZ200), PPGL (RMP/SMP/PVDF), Architectural Aluminium Alloy • Thickness: 0.80 mm to 1.20 mm | Yield Strength: 245 MPa to 345 MPa • Finishes: Mill finish, Plain coated, Stucco embossed (anti-glare), standard RAL shades • Geometries: Straight linear, Convex curved, Concave curved, and Complex tapered profiles Step-by-Step Installation Methodology: Sub-Structure Survey: Laser-verification of purlin plane, spacing, and structural alignment. Thermal Clip Anchoring: Concealed sliding clips fastened directly onto supporting purlins. Panel Engagement: Continuous panels positioned with overlapping female/male vertical ribs. Automated 360° Seaming: Motorized electric seaming machines close joints into an airtight double fold. Flashings & Gutters: High-grade butyl sealants and concealed flashings ensure sealed drainage transitions. Quality & Water Testing: Full joint inspection and artificial hose water-spray testing before handover. Key Applications: Manufacturing Plants, Warehouses & Logistics Hubs, Metro Stations (e.g., Line 4), Airports, Pharma Facilities, and Cold Storage. Why Choose RK Engineering And Contractor (RKEC)? ✔ ISO 9001:2015 certified quality management ✔ Integrated turnkey design, fabrication, and erection ✔ Fabrication base at Chakan MIDC, Pune for rapid site mobilization ✔ Prime mill-certified materials (Tata Steel, JSW, Jindal) with MTC