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Description of Product
This is an assessment of Isothane WBF Spray
Foam Insulation which is an in-situ water
blown spray applied insulation layer
contributing to airtightness and insulation of
roofs for use in new and existing roofs with
pitches 15 degrees and over.
The product is formed using 2 liquids which
are spray applied to form soft polyurethane
seamless foam insulation layer conforming to
BS EN 14325-2 which adheres to the treated
surface. The material produces an exothermic
reaction between isocyanate and resin within
the nozzle of a spray gun during the spraying
process. The foam is spray applied in layers not
exceeding a maximum thickness of 400mm.
Isothane WBF Spray Foam Insulation holds
Agrément certification.
Please consult the ‘Conditions of Certificate’
and ‘Non-Regulatory Information’ sections to
see if the product is acceptable for use on sites
covered by LABC Warranty.
Isothane – WBF Spray Foam Insulation
Key Factors Assessed
Mechanical Resistance & Stability
Safety in case of Fire
Health, Hygiene and Environmental
Safety in Use
Energy Economy and heat retention
Validity
This certificate was first issued on 21st October 2019 and is valid until 21st July 2021
Issue Dated 11th March 2021
Certificate No: EWWS1234
This registered system relates to Isothane WBF for use in pitched roofs with pitches of 15 degrees and over.
Systems examined were for use in:
1. New or existing pitched roofs with breathable felt underlay. Existing felt drape remains. Isothane is sprayed
between rafters directly onto existing LR or HR membranes felt to the required thickness/u value not exceeding a
maximum thickness of 400mm. If product left exposed in non-habitable roof space then fire warning labels are
required.
2. Warm pitch roof – insulation between and under rafters. Isothane is sprayed between rafters directly onto
existing LR breathable felt to the required thickness/u value not exceeding a maximum thickness of 400mm to the
bottom of the existing rafters. Counter battens are then fixed to the underside of the existing rafters and Isothane
filling resumes in 20mm layers. A vapour control layer is provided prior to plasterboarding.
A well-sealed ceiling as described in BS 5250 is required.
Example U value calculations have been undertaken showing conformity with target U values of 0.18 W/m2K and 0.15
W/m2K recommended in Approved Document L1B (England) and Wales. The examples show compliance with AD L with no
risk of interstitial condensation. Bespoke calculations will be provided to suit individual site circumstances, a condition of this
detail.
Roof spaces should be ventilated in accordance with BS5250:2011.
Isothane Ltd is registered under ISO 9001: 2015 (Quality Management System) for design, development and manufacture of
polyurethane chemicals and related materials. The identification and merchanting of products or services which supplement
the manufactured range.
Preparation/Application
Moisture content of roof timbers must be checked with a substrate hygrometer and be less than 20% before application.
Timbers must be dry and any rotten timbers replaced with roof made weather tight prior to installation. Substrates must be
clean, dry and free from dirt, grease oil and loose particles, primer may be required for maximum adhesion.
Water tanks should be covered to prevent contamination during application. Isothane WBF should not be in contact with
flue pipes, chimneys or other heat producing appliances. If hot work is to take place near Isothane WBF, it must be cut
back 2 metres and protected by heat blankets.
The two component parts are delivered in 205 litre drums which must be stored in well ventilated areas between 10 and 25
degrees C. Drums should be protected from direct sunlight or temperatures below 10 degrees for long periods of time, and
protected from heat and frost, humidity and rain. The liquid Isocyanate is harmful under the Chemicals Regulations 2009.
During spraying ambient and substrate temperature should ideally be between 15 and 25 degrees and not lower than 5
degrees.
The process of application may produce a build-up of harmful vapours, which due to being heavier than air may enter lower
parts of the building, it is therefore essential that suitable ventilation is provided. Protective clothing should be worn by all
those in application area. In confined spaces use of an extractor fan is recommended.
Isothane WBF is sprayed in sections starting at the eaves working up towards the ridge, from left to right and right to left
continuously. The product is sprayed between the rafters to the underside of the existing felt, the drape of felt will remain
unaffected due to product being liquid in nature allowing drape to remain. Additional layers are applied within 10 minutes
to achieve required design thickness, up to 400mm. Once dry the product can be cut with a hand saw.
For Scotland purposes:
Bespoke calculations for confirmation of u-values including a condensation risk assessment and roof ventilation
proposal will be provided to suit individual site circumstances, as a condition of this detail.
Installation to be by trained installers in strict accordance with manufacturer’s instructions, guides and recommendations and
supported by relevant u-value calculations and condensation risk analysis.
The specific roof construction is to be verified to enable appropriate solution and bespoke U value calculations to be
provided to suit individual site circumstances.
The product must not be in contact with electrical cables and recessed spotlights are not allowed.
Separation distances from flues to Isothane WBF (combustible material) should conform to guidance in Approved Document
J.
Lining board is required to provide internal fire protection when the product is used for room in the room situation.
For Scotland purposes:
A job specific U-value calculation, a condensation risk analysis and proposals for roof void ventilation as appropriate
should be provided.
Separation distances from flues to Isothane WBF (combustible material) should conform to guidance in Section 3
Environment of the Domestic and Non-Domestic Technical Handbooks.
An approved installer would carry out the site assessment and would have been trained/assessed by Isothane in order
to achieve the status of ‘approved installer’.
The specifications and materials referred to have been assessed in accordance with the Building (Scotland) Regulations 2004
and in accordance with the supporting guidance in the Domestic and Non-Domestic Technical Handbooks which came into
force with effect from 1 October 2019.
Where reference is made on a plan or specification document to any Code of Practice, British or European Standard or
manufacturer’s instruction it shall be construed as a reference to such publication in the form in which it is in force at the
date of this registered detail.
The materials specified shall not be changed without first gaining approval so to do. Failure to do so will invalidate the
Registered Detail.
This Registered Detail should not be regarded as a formal approval under the building warrant process prescribed by the
Building (Scotland) Act 2003 enacted from 1 May 2005. It supports the site-specific building warrant submission required in
every case.
For LABC Warranty purposes:
The product must be used in strict accordance with Kiwa BDA certificate BAR-18-048-P-A-UK.
Kiwa BDA certificate BAR-18-048-P-A-UK must remain valid.
The product may be used as an insulation on tiled and slated pitched roofs.
The product must also meet all the requirements of Section 11 of the warranty Technical Manual.
When used on existing roofs, all the requirements of Appendix D1 of the warranty Technical Manual must also be met.
The product may only be installed by installers who have been trained and approved by the certificate holder.
Roof pitch must be greater than 15 degrees for use of this product.
Type LR roofing felts must be used excluding room in the roof/vaulted ceiling applications where a HR roofing felt must be
used (with a suitable VCL), where type HR roofing felt is used ventilation must be incorporated as per Section 11 of the
technical manual.
Thickness of the product must not exceed 400mm.
The product must not be installed over electrical cables and services unless suitably protected from contact with the
insulation.
Moisture content of timber must be below 20% prior to application/installation
Condensation risk analysis will need to be provided on a site by site basis.
A clear 50mm air path must be provided above the breather membrane with a continuous 25mm vent at eaves level and a
continuous 5mm vent at ridge level as per section 6 of the technical manual.
LABC and LABSS consider that, Isothane WBF Spray Foam Insulation will meet the functional
requirements of the Building Regulations (listed below) if the criteria detailed in this certificate are met;
The Building Regulations 2010 (as amended) England & Wales
Please refer to individual Regulations below.
The Building Regulations 2010 (as amended) England
Regulation 7 (2018) Materials and workmanship
Note: Subject to the Scope of Registration and Conditions of Certificate.
AD C (2013) Site preparation and resistance to contaminants and moisture
Note: Subject to the Scope of Registration and Conditions of Certificate.
AD J (2013) Combustion appliances and fuel storage systems
Note: Subject to the Conditions of Certificate.
The Building Regulations 2010 (as amended) Wales
Regulation 7 (2013) Materials and workmanship
Note: Subject to the Scope of Registration and Conditions of Certificate.
AD C Site preparation and resistance to contaminants and moisture
Note: Subject to the Scope of Registration and Conditions of Certificate.
AD J Combustion appliances and fuel storage systems
Note: Subject to the Conditions of Certificate.
The Building (Scotland) Regulations 2004 (as amended)
Technical Handbook Domestic and Non-Domestic
Regulation 8 Durability, workmanship and fitness of materials
0.8.5: Ways of establishing the fitness of materials
Regulation 9 Building Standards applicable to construction
Note: Construction shall be carried out so that the work complies with the applicable
requirements of schedule 5.
Mandatory
Standard 1.1 Structure
1.1.0 Introduction
1.1.1 General
1.1.2 Loading
1.1.3 Design and construction
Note: An approved installer should carry out the site assessment. Such installer would be
trained/assessed by Isothane to achieve the status of ‘approved installer’.
Mandatory
Standard 2.5 Internal linings
Note: Isothane WBF Spray Foam must be lined with a suitable board if exposed in any
habitable room created.
Mandatory
Standard 3.10 Precipitation
3.10.1 General provisions
3.10.8 Roof constructions (pitched)
Note: Isothane WBF Spray Foam can be applied onto the underside of sarking boards as
described in KIWA BDA Agrement certificate BAR-18-048-P-A-UK.
Mandatory
Standard 3.15 Condensation (Domestic)
3.15.1 Condensation
3.15.3 Control of condensation in roofs
3.15.5 Interstitial condensation
Note: An appropriate Vapour Control Layer should be installed at ceiling. Prior to
specification a condensation risk analysis should be carried out to assess suitability
and the nature of the VCL to be used as described in KIWA BDA Agrement certificate
BAR-18-048-P-A-UK.
Mandatory
Standard 4.5 Electrical safety
4.5.0 General
4.5.1 Electrical installations
Note: Wiring should not be encapsulated within Isothane WBF Spray Foam as the
thermal properties could lead to potential overheating and wiring should be
installed in conduit.
Mandatory
Standard 6.2
6.2.0 General
6.2.3 Limiting heat loss through thermal bridging
Note: Care must be taken in the overall design and construction to minimise thermal
bridging and air infiltration.
6.2.6 Conversions of unheated buildings
6.2.7 Conversions of heated buildings
6.2.9 Extensions to the insulation envelope
6.2.11 Alterations to the insulation envelope
Note: A site specific assessment must be made in every case to establish the maximum U-
value required for the product, and the related elements, used in the make-up of
the roof.
LABC Warranty
The product has been assessed by LABC Warranty and is considered acceptable for use on sites
covered by LABC Warranty subject to the conditions listed.
KIWA BDA Agrément BAR-18-048-P-A-UK Dated: September 2019
BSI Cert ISO 9001 FM 21549 - 2016 to 2019
WBF_RS001_LABC UK - LABC U Values
WBF_RS001_LABC Wales - LABC U Values
Isothane Ltd
Newhouse Road
Huncoat Business Park
Accrington
Lancashire
BB5 6NT
Tel: 01254 872555
Email: [email protected]
Web: www.isothane.com