Celotex Rafter-Gold
Featuring TLX Gold
Celotex Rafter-Gold featuring TLX Gold is a unique system designed for re-roofing
existing properties using a combination of Celotex GA4000 high performance PIR insulation
and TLX Gold - the unique intelligent 2 in 1insulating breather membrane.
This system has the following features and benefits:
• Upgrade the insulation of your pitched roof without the
need to raise the roof height
• Does not require a vapour control layer
• TLX Gold adjusts its rate of breathability according to
the amount of moisture it is exposed to
• The system provides excellent thermal comfort
• Systems available for either 100mm or 125mm deep rafters
offering u-values as low as 0.26 W/m2K
Celotex Rafter-Gold System
Celotex GA4000 physical properties
Compressive strength
Method
GA4000
BS EN 826
≥140kPa
BS EN 1604
DS(70,90)3, DS(-20,-)1
BS EN 12086: Method B
>150 MNs/g
BS EN 12667
0.022 W/mK
BS 476-7
Class 1
Method
TLX GOLD
Moisture transmission - Top breather membrance
BS EN 3177
0.21 MN s/g MVTR:975 g/m ² 24hr
Core thermal resistance
BS EN 16012
0.850 W/m2K
EN 11925-1
Class E
Emissivity
-
0.16
Vapour resistance
-
0.50 MN s/g
Dimensional stability
Water vapour resistance
Thermal conductivity
Surface spread of flame
Board size: 1200mm x 2400mm
TLX Gold physical properties
Fire
Membrane dimensions: Width (effective) 1200mm | Flap 150mm | Length 10m
For full product specification and accreditation including the ‘How to install the system application video’ visit: celotex.co.uk/rafter-gold
A bit about us
Celotex products protect countless buildings the length and breadth of the UK. Providing PIR insulation for over 90 years,
our solutions and product development continue to make a difference not just by creating warmth and comfort but by
saving energy too. Every day, thousands of professionals choose Celotex. For them, Celotex is insulation. Plus, all Celotex
products come with a suite of practical online tools, as well as exceptional personal support and aftercare.
TLX Insulation specialises in difficult-to-insulate buildings. TLX Insulation’s work ranges from loft conversion and housing
extensions to large social housing projects and historic buildings. TLX insulate barns, swimming pools, libraries, museums,
hospitals and schools.
Installation guidelines
100mm Rafters
U-value = 0.33W/m2K
125mm Rafters
U-value = 0.26W/m2K
TLX Gold
TLX Gold
Unventilated air layer
Unventilated air layer
75mm Celotex
GA4000
50mm Celotex
GA4000
Plasterboard
Plasterboard
Installation guidelines
Celotex GA4000 series boards should be fitted between the
rafters before TLX Gold is installed. For the 100mm rafter system
50mm GA4050 should be installed and for the 125mm system
75mm GA4075 should be installed. This leaves the minimum
50mm rafter space required to adequately drape TLX Gold.
When installing Celotex Insulation the key elements that must
be considered are:
• Appropriate PPE should be worn when handling Celotex PIR
rigid boards.
• Measure accurately the width of each rafter space to be filled
prior to cutting the board. Ensure there is a tight fit between
insulation and rafters to minimise air leakage and heat loss.
• Cut the Celotex GA4000 board slightly oversized with square
edges to achieve a ‘friction fit’.
• Any gaps should be filled with suitable expanding foam.
• Where boards butt together joints should be taped with
Celotex Insulation Tape.
TLX Gold must be installed with the Gold side facing into
the building.
• Cut TLX Gold to size using sharp scissors, such as carpet fitting
scissors
• Starting at the bottom of the roof simply roll out horizontally
across the rafter leaving a 10mm drape as you go, fix in place
with staples of at least 14mm, it must be installed with TLX Gold
film facing down and breathable membrane up.
• To seal the edges of TLX Gold and create a vertical lap separate
the membrane from the insulation and trim back to the last
rafter. Fit the adjoining roll butted up to this with the created
flap over the top. Seal with single sided tape.
• An air gap of 10mm should always be left between
TLX Gold and the Celotex Insulation in order to achieve
optimum performance.
• TLX Gold comes with a 150mm overlap of breathable membrane
at the bottom of each roll, which is fitted with an integrated
tape making joining to the next roll fast and easy to do.
• Finally fit tile battens ready to be tiled.
Certifications and accreditations
‘Literature’ pages.
Further information
Celotex GA4000 is BBA Certified.
TLX Gold is BBA Certified.
Celotex Rafter-Gold is LABC Accredited.
Celotex has a policy of continuous product
development and reserves the right to alter
product designs or specifications without
prior notice.
For more advice on this unique system
application, contact the Thermal Hotline
for guidance.
Saint-Gobain Construction Products UK Limited trading
as Celotex. Registered Office: Saint-Gobain House, Binley
Business Park, Coventry CV3 2TT. Registered in England
and Wales No 734396
Thermal Hotline T: 01204 674 747 E: [email protected]
Celotex Lady Lane Industrial Estate, Hadleigh, Ipswich, Suffolk IP7 6BA celotex.co.uk