Don & Low designed the MultiTX® range of underlays with moisture transfer in mind to mitigate the risk of condensation within the roof structure and ensure optimal protection against the elements. Notably, the MultiTX® range includes products that have obtained Agrement certification from BBA in the UK, affirming their suitability for warm non-ventilated, cold ventilated and non-ventilated pitched roof systems and walling. Additionally, MultiTX® Plus has received NSAI approval in Ireland.

The MultiTX® range of products is well-suited for various roofing applications, including fully supported or unsupported cold and warm systems. The comprehensive range comprises four distinct products, each differing in weight and construction, catering to diverse roofing underlay and walling membrane requirements.

Key benefits

• The modern alternative to traditional bituminous-based (type 1F) roofing felts
• Lightweight fabric minimises manual handling issues
• Excellent low-temperature flexibility
• Resistant to water penetration and stabilised against UV degradation

Additionally, the MultiTX Solar, when used with close-fitting PV panels

• Removes the need for a ventilated counter batten space
• Helps to comply with Building Regulations Part L, Future Homes Standards & NHBC
• Resistant to water penetration and stabilised against UV degradation
• It helps to meet BS 5250 Ventilation requirements when used with High and Low-Level Ventilation.

* Additionally, all the MultiTX® products mentioned above are available in MultiTX®Conseal variants, providing an alternative option with enhanced sealing capabilities.

MultiTX® Range products are high-vapour-resistance air and liquid barrier roofing underlays. They are durable, clean, easy to cut and install, and offer excellent temporary protection against wind-driven rain, snow, and dust. The MultiTX® Range conforms to the Construction Products Regulation (EU Regulation No. 305/2011), Underlay for discontinuous roofing (Annex ZA of EN 13859-1) and is manufactured under the control of an ISO 9001 quality management system.