A PROCTOR GROUP - WRAPTITE® AIRTIGHTNESS SOLUTION
Project - Wraptite®
Sector - Residential
Technology - Offsite
Company - A Proctor Group
The superior airtightness performance of the Wraptite membrane from the A. Proctor Group is
delivering huge benefits to both the in-factory and on-site construction of a series of new modular
social housing for Anglesey Council.
Wraptite is the only self-adhering vapour permeable air barrier certified by the BBA. Applied
externally on the outside of the structural frame, Wraptite simplifies the process of maintaining the
envelope’s integrity, as there are less building services and structural penetrations to be sealed.
The high vapour permeability of Wraptite allows the substrate beneath to dry quickly and
moisture vapour to escape, and reduces the likelihood of mould, mildew, condensation, timber
distortion and metal corrosion. The self-adhesive nature of Wraptite means that it is easy to apply
together with Wraptite Corners and the fact there is no requirement for mechanical fixings.
Specialist contractor Kenton Jones was commissioned by the Isle of Anglesey County Council
to construct the new homes using a high-performance timber frame system. Managing Director,
Kenton Jones explains how Wraptite was key to achieving a quality airtightness solution which was
suited to modular build.
“After 10 years of building an open panel high-performance timber frame system, we moved to
a factory insulated closed panel system which had the airtightness and VCL applied in the factory
and simply taped on-site. This worked well when the airtightness layer was fully accessible before
services were installed on site.
“In 2019 we built a new module factory and delivered our first set of modules early 2020, it was
then we realised internal airtightness was going to be a difficult detail. When building modules
that are fully factory finished internally but need to be craned together on-site to form the same
dwelling both in a vertical and horizontal joint, we identified that there would be areas of the
building which would remain inaccessible after installation on site.
“The first stage of the project was supplied with internal airtightness applied off-site that had very
technical, vulnerable details to continue the airtightness around the dwelling within the small access
areas left for finishing on-site after installation. This method proved very time consuming in the
factory swapping from our usual airtightness board to flexible airtightness membranes between
the modules. The cost of this was not sustainable so we needed to look for an alternative.
“We chose Wraptite to achieve the low value airtightness we required for the module system. The
benefits of having the airtightness layer externally were a huge saving in time in the factory and
impressive simplifying of details to achieve the same quality results. Wraptite was installed off-site
in a factory environment for speed and ease and simply taped together on-site between modules
to achieve the airtightness.”
“Overall we saved time and money with Wraptite, we now have a set of high performance
technical details for the airtightness in our module system which are easy to achieve and help
maintain a robust quality control system.”