Roof tile manufacturer Creaton has revised three of its four roof underlayment models DUO, TRIO and QUATTRO and partially expanded them. The product revision signals growing technical pressure on roof systems in multi-story timber construction, where roof underlayment must be designed not only as a temporary moisture barrier, but as a permanently functional component of the building envelope. In particular, requirements for sd values (diffusion-equivalent air layer thickness), aging resistance according to DIN 4108-3 and compatibility with air-tight layers according to the Energy Saving Ordinance have become more stringent in recent years.
Creaton is positioning itself with the expanded product range specifically in the segment of vapor-diffusion-open, high-tear-strength membranes for pitched roofs. The DUO, TRIO and QUATTRO models differ primarily in the number of layers and thus in mechanical load capacity as well as in water vapor permeability. While DUO with two layers is designed for simple pitched roofs with tiles or roof stones, QUATTRO targets high mechanical requirements, such as those encountered in large-scale roof constructions in laminated veneer lumber (LVL) or cross-laminated timber (CLT) construction methods.
The optimization likely also responds to increased demand for EPD-certified building components. Planners in multi-story timber construction increasingly demand Environmental Product Declarations to demonstrate the life cycle assessments of their projects according to DGNB or BNB certification. Polyolefin-based roof underlayment, such as those used by Creaton, offer advantages over bituminous alternatives in terms of recyclability and CO₂ balance, provided take-back systems are established.
From an economic perspective, the product range expansion reflects competitive pressure in the consolidated roofing market. Creaton is in direct competition with BMI/Braas and Erlus, which also offer systemic roof solutions with integrated sealing layers. The trend is moving away from individual components toward coordinated system solutions that provide warranty security over the entire service life – an argument that is particularly appealing to general contractors and investors in timber frame construction.
For architects and specialist planners, the product revision means an expanded selection within a manufacturer system. What remains crucial is coordination with the insulation layer, particularly in vapor-diffusion-open constructions with wood fiber insulation or mineral wool, to prevent condensation in the construction. Compliance with standards according to DIN 68800 (wood protection) and adherence to air-tightness requirements according to DIN 4108-7 should be a priority when selecting products.
