56
EXTERNAL ENVELOPE
Proctor Air® A
provides peace of mind
significant challenge when working on the roof of any existing, occupied building is protecting the people inside the building without the full roof system in place. That challenge is multiplied when the building in question is large and work has to be carried out in sections over a longer period of time.
At Hatchmeadow apartments in Northumberland,
offered long-term peace a key performance
characteristic of Proctor Air that helped to address these challenges was its water holdout. That, combined with its vapour and air permeability,
of mind for the building owners, as well as apartment residents.
The roof included an area of solar PV panels, so the new roofing system had to be capable of providing weathertightness and condensation control in several different circumstances across the single building – all while residents remained in occupancy during the work.
Using Proctor Air as part of a ‘belt and braces’ solution James Roy,
senior quantity surveyor at
Wensley Roofing, describes the replacement roof system as a “belt and braces” approach. “The specification used Proctor Air over the rafters, followed by counter battens, tile battens, and a new pantile finish,” he explained. “We even used butyl tape over the nail holes to provide a complete seal against rainwater.” At the time of writing, Wensley Roofing are about halfway through the reroofing work. “Some of the residents were having to use buckets to catch leaking water,” said James. “Since installing this new system the leaks have now stopped, and there has been some bad weather.”
How has Proctor Air helped the reroofing process?
The attention to detail required to deliver the thorough specification, coupled with the size of the Hatchmeadow apartments roof, has naturally restricted the pace at which the work can be delivered. As a premium roofing membrane, Proctor Air has helped to alleviate any concerns about leaving the underlay exposed for short periods of time.
ADF05_A Proctor_External Envelope -
Roofing_HPAdv.indd 1 “The belt and braces approach has made
labour a challenge on this project,” said James. “But with the Proctor Air membrane in place, we’ve been comfortable leaving it exposed for a couple of days if necessary, knowing that residents in the apartments below are still protected.”
This reassurance is possible because Proctor
Air is rated W1 under EN 13859-1, with over 1m Head of Water, and has hydrophobic additive in all three of its layers. Its water resistance meets the guidance of NFRC’s Technical Bulletin 6.
Additionally, 01250 872 261
proctorgroup.com/products/proctor-air 26/04/2024 11:59 the
membrane can be left exposed to UV for up to three months.
WWW.ARCHITECTSDATAFILE.CO.UK
ADF MAY 2024
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