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Protect Wunderlay® underlay

Protect Wunderlay® is a modern, lightweight HR roofing underlay designed for all cold and warm pitched roofs, developed as an alternative to traditional Type 1F, 5U felts and plastic sheet materials and is used in conjunction with high and low level ventilation. Providing a secondary line of defence against wind driven rain and snow, Protect Wunderlay® offers wind uplift resistance to ensure wide coverage across the UK and Ireland for wind uplift.

Features & benefits

  • Easy to cut, clean and light to handle.
  • Proven time saving over traditional felts.
  • Suitable for use in Zones 1-4 at 345mm batten gauge, without the need for additional sealing tapes.
  • Completely water and air tight.
  • Can be used as temporary roof covering.
  • Excellent nail tear and tensile strength.
  • Fully independently certified by BM TRADA and CE marked.
  • Resistance to wind pressure – 1367Pa, tested to BS 5534.

  • UKCA and CE marked.



Range Brochure


Product Brochure


Specification clause






Fixing instruction


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Have a question?

For any questions or queries about our product ranges and the technical support services we can offer, please contact us using the form below.

Glidevale Protect is a division of Building Product Design Ltd.

Other subsidiaries include ventilation systems specialist Passivent and Kingfisher Louvres, manufacturer of aluminium louvres systems.

Important Notice

Please be vigilant of fraud/cyber crime. If you receive an email from our parent company Building Product Design Ltd, please check that the email address from the sender ends in '' and any phone number given is 0161 905 5700.

If you receive any emails ending in '' or '', these are NOT legitimate, and you should contact us as soon as possible at

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