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Glidevale Protect chosen for innovative eco house project

Roofing and construction membranes from Glidevale Protect have been used in a unique triangular shaped family home featured on the Channel 4 self-build show Grand Designs.

The house is the brainchild of Olaf and Fritha Mason, designed and built by Olaf himself and his company Mason Carpentry. Situated in West Sussex and built to Passivhaus standards, the Triangle House is so called due to the challenging plot of land on which it was built. Wedged between a busy main road and a railway line with a main sewer running through the land, the triangular footprint was all that was left when the ley ways of the sewer, the railway and the requirements of the building regulators were taken into account. The project began at the beginning of the first Covid 19 lockdown in March 2020 and was completed at the end of the second lockdown in July 2021.

Two membranes from Glidevale Protect were used as part of the build. The traffic-stopping roof that dives down from the top of the house to the driveway was covered with Protect Zytec, a vapour permeable roofing underlay, to help avoid the risk of harmful condensation in the roofspace. Protect TF200 Thermo, a low emissivity reflective breather membrane, was used on the external walls of the house. With its well-known insulating properties and strong aged thermal resistance, the membrane helps to improve energy efficiency and reduce heat loss, adding to the home’s sustainable credentials.

“We are delighted that our membranes have been used in such an innovative and unusual home,” said John Mellor, Glidevale Protect’s senior product manager. “We often see our products featured in projects on Grand Designs; their many benefits including airtightness, thermal performance and condensation control make them equally ideal for self-build projects as well as mainstream new build developments too, where a fabric first approach is key to achieving energy efficiency goals.”

Click the links below for more product information:

Protect Zytec

Protect TF200 Thermo

For more information about the Triangle House, visit

To watch a clip of the Grand Designs show, visit the Channel 4 Lifestyle YouTube channel:

Read more about the project on the Grand Designs magazine website:

Related products

Protect Zytec vapour permeable underlay

View product

Protect TF200 Thermo insulating breather membrane

View product

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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.

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