EXTERNAL ENVELOPE 37
Proctor Group membranes used in next generation SIP technology
F
actory-fi tted Proctor Group membranes were part of the successful construction of the Ultrapanel demo house. The building envelope for a three-bedroom home, from sole plate to ridge, was erected in a single day using Ultrapanel Building Technologies’ Category 2 MMC SIP system. The system features the vapour permeable Proctorwrap Refl ect®
membrane in its
external wall panels. An innovative new cold roof panel features the air permeable, low resistance (APLR) Proctor Air®
underlay.
The two membranes allow SIP panels to be delivered straight to site and installed quickly, providing a watertight building envelope in a matter of hours. Panels can be specifi ed to meet a range of regulations and standards (including the Passivhaus standard), while minimising risks associated with moisture. Proctor Group worked closely with Ultrapanel Building Technologies to establish membrane specifi cations tailored to the offsite manufacture of the panels. For example,
Proctor Air is usually
supplied in 1 m wide rolls, to allow for easier manual handling on the roof. However, in a factory environment, the production line can handle heavier products. Proctor Group therefore supplied a bespoke 3 m wide roll to suit the width of the cold roof panels. Proctor Group’s sales director,
John Johnston, attended the demo house
construction day and said: “At a time when labour costs are so expensive, Ultrapanel’s SIP system will likely be very appealing to
housing associations, and social housing providers in particular.
That could make a real difference to whether the UK can achieve its ambitious housing targets.”
01250 872 261
proctorgroup.com/products/proctor-air
OPTIMUM
Zenon Optimum has been designed to optimise natural daylight enhance thermal performance helping reduce the energy demand and operational carbon of the building.
NBS Source PARTNER
ADF FEBRUARY 2026
WWW.ARCHITECTSDATAFILE.CO.UK
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