February 2024

(including airtightness). With more people adopting hybrid working
and spending more time at home, excessive levels of moisture
vapour in the air are increasingly common.
Selecting an air permeable LR underlay can mean that no vapour
control layer (VCL) is required in the ceiling. It’s also unnecessary
to ensure that ceilings are constructed as ‘well-sealed’, as described
in BS 9250, however the ceiling should be convection tight. Moist
air passes into the roof space and, in quick succession, to the
outside air.
Knowing that insulation can be installed right into the eaves
with no risk of blocking ventilation is reassuring from a building
performance point of view, and from the point of view of avoiding
condensation in the roof space.
A true ‘fit and forget’ product
Hidden from view, pitched roof underlays usually warrant little
attention from building users. Yet they play a vital role in protecting
those same users from the elements, and from unhealthy indoor
climates.
Proctor Air ® : an air permeable LR membrane for the future
With these competing challenges in mind, A. Proctor Group has
developed a pitched roof underlay for the future: Proctor Air.
As an air permeable LR underlay, Proctor Air makes pitched roof
constructions simpler. No VCL is required in the ceiling, which also
does not need to be well-sealed. And no ventilation measures
are required in the cold roof space, since the membrane permits
the passage of both air and moisture vapour through the roof
construction.
A. Proctor Group is a 4th generation family business with a history
of technical innovation, promoting good practice, and developing
products that roofing contractors want to use. We have applied
this wealth of experience to creating the next generation of air
permeable LR membrane.
By choosing and installing Proctor Air, specifiers, contractors
and building owners/managers can enjoy the confidence that
comes from a high-performance product doing its job without
intervention.
In fact, Proctor Air provides a more uniform flow of air than
normal vents. This is particularly useful in complex roofs, where
‘dead’ areas of poor ventilation can occur even when ventilation
measures have been installed well.
Proctor Air’s water resistance has been tested and meets the
guidance of TB06. At the same time, it reduces the risk of issues
occurring in roof spaces due to poorly installed VCLs or ventilation,
since neither is needed.
Keeping with the theme of future-proofing, avoiding the need
for ventilation – particularly at the eaves – helps when it comes
to installing the substantial thicknesses of insulation required in
lofts. With the impending introduction of the Future Homes and
Building Standards to consider as well, those thicknesses may well
increase.
All of this is backed by our unique 15-year warranty, offering peace
of mind even in the face of an uncertain future climate.
For more information visit: https://proctorgroup.com/products/
proctor-air
01250 872 261
contact@proctorgroup.com
www.proctorgroup.com