Project Case
China Steel Roof Project
Breathable membrane deployment for large steel roof systems.
Key Points
This reference explains how KOSITE membrane products are used as a supporting protection layer in metal roof assemblies. It focuses on material selection, roll supply, packing confirmation and installation communication for project buyers, contractors and distributors.
- Roof underlayment support for steel roof structure
- Weather-resistant membrane layer for project protection
- Export supply coordination for project material demand
Application Focus
- Secondary protection below metal roofing or roof covering systems
- Water-resistant support during construction and service conditions
- Roll goods supplied with project packing, label and shipment coordination
Buyer Checks
- Confirm roll width, GSM, water resistance and tensile strength before order
- Review roof slope, overlap direction, fixing method and tape requirement
- Check sample surface, roll edge, packing condition and delivery schedule
Project Scope
- Used for roof deck protection before final roofing installation
- Suitable for warehouse, factory and light steel roof projects
- Material supply can be arranged by roll, pallet or container shipment
Site Control
- Keep membrane covered before installation and avoid wet ground storage
- Inspect laps, edges, fasteners and penetrations before closing the roof layer
- Record roll batch, packing photos and shipment details for repeat orders
Roof underlayment material and installation notes
This case shows how waterproof breathable membrane can work as a secondary water-resistant layer below the final roof covering while supporting moisture release from the roof assembly.
Technical points
- Review membrane weight, roll width, tensile strength, water resistance, breathability and UV exposure time before project confirmation.
- Install from the lower roof area upward so upper layers overlap lower layers in the water-shedding direction.
- Keep overlap, fastening density, edge treatment and penetration sealing consistent with the roof system design.
- Use compatible seam tape or flashing tape around vents, pipes, valleys and roof-wall junctions where extra sealing is required.
Files buyers can request
- Product data sheet with GSM, roll size and typical performance range.
- Sample roll or cut sample for hand feel, appearance and field review.
- Packing photo, label layout and private label artwork before bulk order.
Why this matters for buyers
Roofing underlayment is not only a roll material. It becomes part of the roof moisture-control system. A stable membrane helps the roof resist wind-driven rain during construction and helps reduce trapped moisture after installation.
For OEM buyers, the important point is repeatability: consistent roll weight, stable printing, clean winding and packaging that can survive export handling. KOSITE can support sample review and technical files before bulk order.