Overview
ISO 8145:1994 - Thermal insulation - Mineral wool board for overdeck insulation of roofs - Specification defines the required properties, tolerances and test methods for bonded man‑made mineral wool board used as overdeck roof insulation. The standard applies to rigid mineral wool boards intended for roofs that carry foot traffic by maintenance personnel only. It specifies what manufacturers must declare at delivery (dimensions, thermal properties, production code, etc.) and provides methods and limits for assessing product performance. Note: test results are for specification purposes and should be converted to design values using guidance (for example ISO/TR 9165).
Key topics and technical requirements
- Product scope: bonded mineral wool board for overdeck (external) roof insulation; boards may have a facing membrane but are not intended to be waterproof.
- Declared information: manufacturer name, product designation, nominal length, width, thickness, area, nominal R‑value or thermal conductivity (λ) and mean test temperature, production code, origin, facing type.
- Dimensional controls: length, width and thickness measured per Annex A; squareness and flatness checks with specified tolerances.
- Thermal properties: thermal resistance (R) or conductivity (λ) declared; measurements per Annex E (and ISO 8301 / ISO 8302). Manufacturer’s declared thermal conductivity must not be exceeded; R must be ≥ 95% of declared value.
- Mechanical properties:
- Deformation resistance: average deformation ≤ 10% under 20 kPa for 24 h at 23 °C; additional deformation ≤ 5% after further 24 h at 80 °C (Annex B).
- Interlaminar strength: ≥ 7.5 kPa (Annex C).
- Breaking load: > 80 N in both directions (Annex D).
- Fire behaviour: must comply with applicable local fire regulations and codes.
- Sampling and conformity: Annex F recommends sampling procedures; Annex G describes a third‑party certification system (informative).
- Test reports and marking: standardized content for lab reports and product markings are specified (see Clause 7 and Clause 6).
Practical applications and users
ISO 8145 is used by:
- Manufacturers of mineral wool boards to set product specifications and prepare compliant delivery documentation.
- Product testing laboratories to perform standardized tests (dimensions, thermal and mechanical performance) and issue test reports.
- Architects, specifiers and roof system designers selecting overdeck insulation for flat and low‑slope roofs where occasional maintenance foot traffic is expected.
- Contractors and roofing installers for quality acceptance and compliance verification.
- Certifiers and regulators assessing conformity, labeling and performance claims.
Related standards
- ISO 7345 - Thermal insulation: physical quantities and definitions
- ISO 8301 / ISO 8302 - Determination of thermal resistance (heat flow meter and guarded hot‑plate)
- ISO/TR 9165 - Practical thermal properties of building materials and products
- ISO/TR 9774 - Application categories and basic requirements
Keywords: ISO 8145, mineral wool board, overdeck insulation, roof insulation, thermal insulation, deformation resistance, interlaminar strength, thermal conductivity, thermal resistance.
