Technical analysis
How the Chinese industry standard for water-resistive and vapour-permeable underlays is used in specification, testing and acceptance.
Engineering scope
- Principle
- Use the standard to align product naming, declared characteristics and test communication.
- Verification
- Match the report sample, product model, batch and project requirement; a standard reference is not a complete roof-system approval.
- Field control
- Keep the official status check, procurement specification, delivery labels, retained samples and test records in one traceable file.
System decision
Start with the actual roof or wall build-up, climate, indoor condition and risk at the relevant interface. Product data must be connected to a defined layer and detail.
Documentation and acceptance
Keep design details, approved product data, delivery labels, batch records, mock-ups, concealed-work photographs and repairs traceable to the installed area.