Roofshield® is a high-performance air and vapour-permeable roofing underlay manufactured by Don & Low in the UK. Its patented three-layer Spunbond–Meltblown–Spunbond structure allows both air and moisture vapour to diffuse through the roof build-up, helping to control condensation and manage moisture during the building drying-out phase.

The membrane provides a durable secondary weather barrier against wind-driven rain, snow and dust. BBA certified and NSAI approved, Roofshield® is suitable for unventilated warm and cold pitched roofs in both supported and unsupported applications. Its high air permeability removes the need for roof space ventilation, simplifying roof design while improving long-term moisture management.