March 2020

(QUITE INTERESTING)
INSULATION FACTS
By QI (Quantum Insulation Ltd)
‘WFRL
and the importance of
correct installation’.
Above: Attention to detailing will also be important to ensure compliance with the revised ADL’s.
By adopting this fabric first approach with careful detailing, it is possible to
limit heating demand from the outset and relatively simple to build on a solid
performance further by fitting renewables or decarbonising supply.
When are the final versions likely to
come into force?
The new versions of ADL for housing are expected to be implemented before
the end of the year. In addition, the Government has stated that changes to
the Approved Documents covering new non-domestic buildings will also be
implemented in 2020.
Can we expect further changes in the near future?
In both cases, the revisions to Part L are seen as a stepping-stone to a Future
Homes Standard in 2025. This will inevitably require homes to reach a much
tougher overall emissions target and tightened fabric requirements. As such,
it makes sense to use this year’s revisions as an opportunity to gear up and
begin to implement solutions which can provide an improved fabric
performance, that sets those buildings up for the future.
The installation of the Wa
ater Flow Reducing Layer
in inverted roof
insulation systems has been highlighted as a concern. It has been
achieved. It is therefore important that the WFRL
is installed correctly.
(vapour permeable) membrane installed over inverted insulation to
It is imperative that the inverted roof system itself is also designed
the outlets.
The Insulation and WFRL are loose laid. Only as much as can be ballasted
should be installed at any one time,
thus protecting the insulationn
insulation at right angles to the designed fall of the roof, starting at
surface. The WFRL should be “star cut” and turned up around soil pipes,
Inverted Green Roofs and Blue Roofs carry additional design
information should be sought from the system provider.
should ensure that the WFRL
has been installed correctly and care should
lifetime of the system.
Above: Kingspan Insulation offer a range of thermally efficient solutions for all areas of the building
envelope. These can allow the most demanding U-values to be met with a slim construction.
Next month’s QI by QI – ‘Crucial consideration in calculating U-Values
in Inverted roofs’.
Contact Kingspan Insulation
01544 387 384
www.kingspaninsulation.co.uk
@KingspanIns_UK
MARCH 2020 TC 61