Description
Termofol Superterm 6 mm underlay
Superterm is an XPS underlay for a compatible floating floor construction. The Termofol catalogue shows it beneath heating film, with a vapour control layer and suitable flooring above. The manufacturer specifically mentions floating vinyl floors. It is a different product from the Termoterm board for heating mats beneath ceramic tiles. Assess the complete combination before using the underlay with a heating system.
Data from the 2025 catalogue
Superterm measures 120 × 80 × 0.6 cm and covers 0.96 m² per board. The catalogue lists XPS, thermal conductivity λ = 0.035 W/(m·K), compressive stress at 10% deformation CS(10/Y) = 400 kPa and long-term water absorption by immersion ≤ 1% by volume. Reaction-to-fire class is E. The 400 kPa figure is a deformation test value, not a universal permissible service load for every floor.
Flatness, insulation and flooring
The manufacturer mentions accommodating local unevenness up to 0.88 mm. This does not replace checking the substrate’s required flatness, strength and dryness. A 6 mm underlay does not automatically replace existing floor insulation either. Its effect on heating time, consumption and sound depends on the complete construction. We do not guarantee energy savings or a fixed sound reduction.
Follow the approved layer sequence and installation instructions for the substrate, joints, vapour control, heating film and flooring. Check that the selected vinyl, laminate or other panel is approved for the combination. Water absorption does not prove the complete floor is waterproof; bathrooms and damp substrates require a separate assessment. Do not treat this board as a universal base for mats, cables, tile adhesive or levelling compound on the strength of a general description.
Advice and scope of supply
We help private and business end users, installers and wholesalers select a suitable combination. Send dimensions, substrate, flooring and heating system details. Together we assess the quantity, total build-up height and additional components. Confirm the sales unit, availability and terms before ordering.