25 cm glasswool for attic floor insulation: material specification and performance

Uninsulated attic floors and roof spaces account for 25–30 % of total heat loss in residential and commercial buildings. In modern energy retrofits and national subsidy programs across Hungary, installing a total thickness of 25 cm glasswool has become the established technical standard for optimal thermal performance and rapid return on investment.

Why 25 cm (2 × 12.5 cm) is the engineering benchmark

• Staggered joint layout: Installing two 12.5 cm layers perpendicular to each other or with offset joints eliminates thermal bridging at seams.
• Thermal performance: With ODE Starflex (λ = 0.039 W/mK), 25 cm yields a thermal resistance of R = 6.41 m²K/W, delivering excellent heat retention in winter and reduced cooling loads in summer.
• Fire safety: ODE Starflex provides Euroclass A1 non-combustible reaction to fire, ensuring structural fire protection.
• Health & safety: Certified under the European Certification Board for Mineral Wool Products (EUCEB) guaranteeing bio-soluble, non-hazardous fibers.

Complete material package for contractors

EuConX Iso Kft. supplies complete attic insulation pallets and direct truckloads across Hungary:

• Primary insulation: ODE Starflex glasswool rolls (2 × 12.5 cm = 25 cm).
• Moisture control: Bilnur BBarrier BD70 vapor barrier (warm side) and BBarrier BK45 breathable underlay (cold side).
• Compliance package: Factory CE markings, Hungarian Declarations of Performance (DoP), and EPD S-P-00671.

For contractor pricing, truckload delivery schedules, and technical submittal files, email info@euconx.com or call +36 30 968 6527.