INSULATION & ACOUSTICS | PRODUCT PROFILES
Wraptite improves airtightness of student accommodation
The performance benefi ts of
the Wraptite external air barrier
system from A. Proctor Group
has been highlighted in a new
fl agship project to deliver
student accommodation in the
centre of Portsmouth.
ECE Westworks, the Bristol
offi ce of ECE Architecture were
appointed to design a new
23-storey, 576-bed, purposebuilt
scheme, Portsmouth One on
behalf of Crown Student Living.
The main contractor on the
project is Osborne.
Façades contractor Fabrite
engaged façade materials
specialist, InOpera Facades to
provide guidance and design
the support structure behind
the rainscreen cladding.
Providing detailed assessments
in accordance with BS EN 10211
and BRE 443 Conventions
for U-values, InOpera were
reportedly able to model the
JUNE | BUILDING PRODUCTS
performance benefi ts offered by
the total through wall cladding
system incorporating the Wraptite
The Wraptite System was installed
as an external air barrier and
alternative to a traditional standard
breather membrane. Wraptite is said
to be the only self-adhering vapourpermeable
air barrier certifi ed by
the BBA. This approach reportedly
saves on both the labour and
material costs associated with
achieving the demands of energyeffi
ciency in buildings.
Stephen Hull, director of
InOpera Facades, said: “Modelling
the intended construction with the
use of Wraptite, highlighted the
ability to improve airtightness whilst
reducing the depth of rainscreen
support system and insulation. The
use of a standard membrane would
have required a greater emphasis on
this, therefore increasing the overall
component cost of the project.
Minor cladding zone increases on
a project of this height can have a
“The Wraptite self-adhesive
membrane was applied externally,
quickly and easily ensuring a higher
quality installation, and a more
robust through wall rainscreen
The Daylighting White Paper from
Kingspan Insulation has revealed
that insulation specifi cation
can have a signifi cant impact of
daylight levels within a building.
The research assesses the
differences in the average
daylighting factor (ADF) of a room
when Kingspan Kooltherm K15
rainscreen board is used within
the external façade, compared
with mineral fi bre insulation.
Calculations were completed for
build–ups achieving three U-values:
0.11 W/m2.K; 0.15 W/m2.K; and
0.21 W/m2.K, and incorporating
four different window layouts.
The thermal performance of
the rainscreen board allowed
each U-value to be achieved with
reduced external wall and reveal
depths. The research showed
this had a signifi cant impact on
• In all four façade layouts, the
constructions featuring Kingspan
Kooltherm K15 rainscreen board
had a higher ADF than those
with mineral fi bre.
• The percentage of improvement
in the relative ADFs ranged
between 10.6 %–63.2 %.
• All results incorporating
Kingspan Kooltherm K15
rainscreen board exceeded the
minimum daylighting criteria
from BS 8206-2: 2008 (Lighting
for buildings. Code of practice
for daylighting) for bedrooms
and living rooms.
Rockwool launch new
DuctRock is supplied in just
three levels of thickness to make
specifi cation easier and classifi ed
with a fi re rating ranging from EI
30 up to EI 120 (depending on the
thickness chosen), in accordance
with both EN 13501-3 (fi re ducts
and fi re dampers) and EN 13501-4
(smoke control systems).
The black outer foil fi nish
identifi es the DuctRock system as
the latest EN tested solution.
Research links insulation to natural light levels
Rockwool has introduced a fi reresistant
insulation, specifi cally
designed to meet the latest EN
fi re-resistance standards in a varied
range of ductwork applications.
As part of the existing
Rockwool FirePro range, the
DuctRock system meets the EN fi re
resistance standards EN1366-1 for
A and B ventilation duct types, and
EN1366-8 for smoke extraction
ducts. It is fully tested in both
horizontal and vertical applications
for rectangular ductwork, in
addition to dry wall and solid
fl oor penetration details.