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Protect VP300 vapour permeable underlay

Protect VP300 is a medium weight vapour permeable roof underlay with a vapour resistance better than that required by BS 5250 to help reduce the risk of harmful condensation in the roofspace. With a strength greater than many other underlays in its class, Protect VP300 is suitable as a secondary line of defence against wind driven rain and snow for all pitched roofs, including fully supported applications.

Features & benefits

  • Easy to cut and lightweight to handle.
  • Completely water and airtight with >2.0m head of water resistance.
  • UV stable and heat resistant.
  • Good all round performance for its weight and one of the best in its class.
  • Suitable for use in Zones 1-3 at 345mm batten gauge, without the need for additional sealing tapes.
  • Can be used as temporary roof covering.
  • Resistance to wind pressure – 1198Pa, tested to BS 5534.
  • Fully independently certified by BM TRADA.
  • UKCA and CE marked.



Range Brochure


Product Brochure


Specification clause






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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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