The existing structure is part of the assessment
Carrier, insulation, attachment, existing roof covering and new liquid layers together form the actual roof construction. A classification of a different structure cannot be adopted without checking.
Therefore, map out material types, thicknesses, attachment and previous renovation layers before selection.
Compare report and project
Check product variant, primer, membrane, consumption, substrate and test suffix. Deviations should be included as an open technical point in the quotation.
If in doubt, verification by manufacturer, consultant or qualified fire safety expert is required.
- Classification report
- Exact test structure
- Existing roof structure
- Proposed renovation layers
- National project requirement
Set the evidentiary limit
Note which roof zones fall under the same structure and which details or repairs differ. A project passport makes that border controllable later.
Without a demonstrable agreement, PolyShield does not use a general BROOF claim.
This explanation is general and does not constitute project-specific system advice. Subsurface investigation, tax and official system documentation remain decisive.