Photo/isometric drawing

provided by manufacturer

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: technical@isothane.com

Web: www.isothane.com