Xtratherm XT-Walk-R Insulated Loft Decking Boards Instruction Manual
- June 8, 2024
- Xtratherm
Table of Contents
XT-Walk-R Insulated Loft Decking Boards
Instruction Manual
Roofs
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Data Sheet
Thin-R Loft Decking XT/Walk-R is a composite of high performance PIR
insulation with tough OSB board that provides safe access into insulated roof
spaces. XT/Walk-R maintains very high insulation values and complies with
health and safety guidelines.
Whether building new or upgrading, due consideration towards the energy
efficiency of your home can have many benefits, including reduced energy costs
and improved living conditions. One of the easiest and most cost effective
measures to take is to insulate the roof space. But how do you allow safe
access to this space, water tanks, services and fittings? Walk-R is the
solution and provides safe entry as well as improved insulation of the attic
space.
Specification Clause
The roof insulation shall be Xtratherm
Thin-R Walk-R manufactured to EN 13165 by Xtratherm, comprising a rigid
Polyisocyanurate(PIR) core between low emissivity foil facings bonded to OSB
board. The alk-R 86mm with mm Mineral Wool to achieve a U-Value of _
_W/m² K for the roof element.
To be installed in accordance with instructions issued by Xtratherm.
Refer to NBS clause
P10 10, P10 135.
Thermal Resistances
ThicknessPIR| Thickness (OSB)| Overall R-Value(m² K/W)
75| 11| 3.4
Resistance ‘R’ Values
The resistance value of any thickness of Xtratherm insulation can be
ascertained by simply dividing the thickness of the material (in metres) by
its lambda value, for example: Lambda 0.022 W/mk and thickness 75mm -> 0.075/
0.022 -> R-Value = 3.40. R-Values should be rounded down to the nearest 0.05
(m² K/W).
Safe Access to Attic Space
High Thermal Performance
Complies with Health and Safety Guidelines
Easy to Install
Lightweight
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There is a growing awareness of the benefits of upgrading the energy efficiency of our homes by installing energy efficient measures. One of the easiest and most cost effective measures to take is to insulate the roof space, however consideration must be given to safe access to that roof space once the upgrade has taken place.
Xtratherm Walk-R is the solution for high performance lofts – with safe access
“In every roof space where there are cold water tanks or other fitted appliances or services, the Contractor, for H&S reasons must construct a permanent boarded walkway from the roof access point to the tank ball valve position and/or the appliance location. This walkway should be supported above the first layer of insulation to prevent any compaction of insulation below the walkway.” -
Walk-R allows maintenance access and storage in roof space areas.
XT/Walk-R
Length (mm)| 1200
Width (mm)| 600
Thickness (mm)| PIR 75 OSB 11
Other thicknesses may be available depending on minimum order quantity and lead time.
Property & Units
Thermal Conductivity| 0.022 (W/mK)
Compressive Strength| >150 (kPa)
Installation Guidelines
- Boards should be be laid transverse to the joists, spanning minimum of 4 joists at 400mm centres.
- Pre-drill the Walk-R panels and secure with wood screws. Screws should penetrate joists by 30mm and be placed no closer than 25mm from any panel corner. Do not over-tighten the screws.
- Ensure that no electrical cables are damaged or compressed between the Walk-R panels and the joists. Mark the top of the panels to indicate the positioning of any services below the walkway.
- Ceiling joists are not designed to take a floor loading, loads applied should not be excessive. If loading other than maintenance traffic or light storage is required, an engineer should be consulted.
ACDs must be followed to ensure that installation is in accordance with
current Building Regulations and accounted for in the energy calculation.
Ceiling joists are not designed to take a floor loading, loads applied should
not be excessive. If loading other than maintenance traffic or light storage
is required an engineer should be consulted.
Existing loft space – insulation between joists only| Upgraded loft
space – 2nd layer of insulation over joists| Upgraded loft space – 2nd
layer of insulation over joists plus Loft Walk-R access
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Energy Efficient? | Energy Efficient? | Energy Efficient?
Safe Access? | Safe Access?| Safe Access?
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Handling, Cutting and Storage
Xtratherm insulation should be stored off the ground, on a clean flat surface and must be stored under cover. The polythene wrapping is not considered adequate protection for outside exposure. Care should be taken to protect the insulation in storage and during the build process.
The insulation boards can be readily cut using a sharp knife or fine toothed saw. Ensure tight fitting of the insulation boards to achieve continuity of insulation as asked for within the ACDs. Appropriate PPE should be worn when handling insulation. Please refer to Health & Safety data sheets on our website.
The boards are wrapped in polythene packs and each pack is labelled with details of grade/type, size and number of pieces per pack.
Durability
Xtratherm products are stable, rot proof and will remain effective for the
life span of the building, dependent on specification and installation. Care
should be taken to avoid contact with acids, petrol, alkalis and mineral oil.
When contact is made, clean materials in a safe manner before installation.
Thermal Performance
Typical U-Values
Table 1
U-Value calculations to EN ISO:6946
U-Value achieved with 86mm XT/Walk-R
XT/Walk-R Insulated Loft Decking
Joist depth fully filled with fibre insulation
| Joist depth fully filled with fibre insulation | Thickness mm |
|---|---|
| 100mm | 150mm |
| U-Value Achieved | 0.17 |
Expect More KNOWLEDGE
At Xtratherm we understand the importance of giving our customers the best
technical advice.
We have taken the unique industry step of training every one of our technical
team that deals directly with our customers, to the highest industry standards
of competency in U-Value calculation and condensation risk analysis. We have
Thermal Bridging covered also under the BRE/NSAI Thermal modelling competency
scheme, using the most comprehensive 3D software available.
Our team and products are certified in the UK and Ireland and through the
following certifi cations bodies:
- BRE Thermal bridging modelling competency certification
- NSAI Thermal modelling competency scheme
- TIMSA-BBA competency scheme for U-Value calculation and condensation risk analysis
- BBA and NSAI certifi cation of the Xtratherm insulation boards
- SAP and DEAP energy assessment
Our technical team can also provide:
- Thermal calculations
- Technical advice on building regulations in the UK and Ireland
- Technical papers on a variety of topics
- Certifi ed CPDs — BIM modelling
- NBS Specifi cations
- Educational resources for technical secondary and tertiary colleges
Please refer to the Resources section of our website for more details
Xi
The xtratherm Innovation Centre
The Xtratherm exhibition space and training academy has been developed to
assist construction professionals in understanding the principles of
specifying and achieving on-site, best practice insulation standards for new
dwellings, commercial envelope solutions and refurbishment projects.
Get in touch
Dedicated
Technical Team:
UK: 03712221055
ROI: 046906 6050| Thermal Calculations, Technical
Advice or to arrange a technical visit:
info@xtratherm.com| Request a CPD:
cpd@xtratherm.com
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The Sustainable Solution
Specifying Xtratherm is a real commitment to minimising energy consumption, harmful CO² emissions and their impact on the environment. Using our products is one of the most effective ways to reduce energy consumption – in fact, after just eight months the energy they save far outweighs the energy used in their production. In addition, our manufacturing facilities operate to an ISO 14001 certified Environmental Management System.
The BRE Green Guide
The 2008 Green Guide to Specification produced by the BRE gives Xtratherm
Insulation products a rating of A or A+. Green Guide ratings are used to gain
credits in BREEAM (BRE Environmental Assessment Method) for non-residential
buildings, and under ‘Mat 4 – Insulation’ the first credit requires the
building to have an Insulation Index of 2 or greater – only achievable if the
weighted average rating of the insulation is A or A+. This shows that all our
products have been made with materials that have been responsibly sourced. The
standard sets out organisational governance, supply chain management and
environmental and social aspects that are verified and ensure responsible
sourcing of materials.
Responsible Sourcing
Xtratherm has BES 6001 certification for responsible sourcing.
The second BREEAM credit under that category is based on responsibly-sourced
materials – at least 80% of the total insulation used in roofs, walls, ground
floors and services must meet any of tier levels 1 to 6 in the BREEAM table of
certification schemes. Our Environmental Management System is certified under EN
ISO 14001, and our raw materials come from companies with similarly-certified
EMS (copies of all certificates are available for BREEAM assessments). This
level of responsible sourcing meets tier level 6 in the BREEAM table.
Global Warming and Ozone Depletion
All Xtratherm Insulation products use CFC-and HCFC-free materials, and are
manufactured using a blowing agent with a low GWP and zero ODP.
Good workmanship and appropriate site procedures are necessary to achieve expected thermal and airtightness performance. Installation should be undertaken by professional tradespersons. The example calculations are indicative only, for specific U-Value calculations contact Xtratherm Technical Support. Xtratherm technical literature and Agrément certifications are available for download on the Xtratherm website. The information contained in this publication is, to the best of our knowledge, true and accurate at the time of publication but any recommendations or suggestions which may be made are without guarantee since the conditions of use are beyond our control. Updated resources may be available on our websites. All images and content within this publication remain the property of Xtratherm.
Xtratherm UK Limited
Park Road, Holmewood
Chesterfield, Derbyshire
United Kingdom
S42 5UY
T + 44 (0) 371 222 1033
F + 44 (0) 371 222 1044
info@xtratherm.com
xtratherm.com
Xtratherm Limited
Liscarton Industrial Estate
Kells Road, Navan
Co. Meath, Ireland
C15 NP79
T +353 (0)46 906 6000
F +353 (0)46 906 6090
info@xtratherm.ie
xtratherm.ie
ISO 9001 – Quality Management Systems
ISO 14001 – Environmental Management Systems Xtratherm, part of UNILIN
group.
UIBWALKRA4-3
Documents / Resources
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Xtratherm XT-Walk-R Insulated Loft Decking
Boards
[pdf] Instruction Manual
XT-Walk-R, Insulated Loft Decking Boards, Loft Decking Boards, Insulated
Decking Boards, Decking Boards, Boards
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References
- Unilin Insulation (UK) | Formerly known as Xtratherm
- Unilin Insulation (IE) | Formerly known as Xtratherm
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