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Roof Design



The BRE standard BES 6001 has been published to enable construction product manufacturers to ensure and then prove that their products have been made with constituent materials that have been responsibly sourced.  The standard describes a framework for the organisational governance, supply chain management and environmental and social aspects that must be addressed in order to ensure the responsible sourcing of construction products.

Independent, third party assessment and certification against the requirements of BES 6001 then give the organisation the ability to prove that an effective system for ensuring responsible sourcing exists and added credibility to any claims made.

BES 6001 is relevant to any organization that manufactures construction products from foundation products such as cement and steel to concrete pipes and blocks, windows, flooring, roof tiles, plastics, wood products.

Whilst it is more relevant to the B2B market, BES 6001 is also relevant to retail organisations that sell construction products such as the large DIY stores.


BS 6229:2018 Flat roofs with continuously supported flexible waterproof coverings. Code of practice


BS 8217:2005 Reinforced bitumen membranes for roofing. Code of practice

Reinforced bitumen membranes for roofing. Code of practice.  This British Standard covers Built-up roofing, Roofing felts, Roof coverings, Bituminous felts, Reinforced materials, Bituminous products, Roof decking, Flat roofs, Pitched roofs, Roofs, Structural design, Installation, Insulating boards, Thermal insulation, Vapour barriers, Bonding, Joints, Fixing, Nailing, Building maintenance, Repair, Wind loading, Durability, Grades (quality) and Construction operations.


BS EN 13948: 2007 Flexible sheets for waterproofing. Bitumen, plastic and rubber sheets for roof waterproofing. Determination of resistance to root penetration

Determination of resistance to root penetration’ is the British and European standard sets tests methods for establishing the suitability for use in green roof applications.

Unlike the commonly referred to German FLL methods this is a Standard that should be followed to aid compliance with Building Regulations.  The German FLL methods are very similar but are a set of guidance documents rather than standards.

BS EN 1991-1-4:2005+A1:2010 Eurocode 1. Actions on structures. General actions. Wind actions

BS EN 1991-1-4:2005 + Amendment1:2010 is part of the Eurocode series and the European standard for wind actions on structures. It outlines how to measure the impact of natural winds on loaded areas of buildings under construction. It also applies to civil engineering works under construction. BS EN 1991-1-4:2005 + Amendment 1:2010 recommendations cover the whole structure as well as individual parts and components such as cladding units or safety and noise barriers.  It gives design guidance and actions for the structural design of buildings and civil engineering works for wind. This includes the whole structure or parts of the structure or elements attached to the structure, e. g. components, cladding units and their fixings, safety and noise barriers. This part is intended to predict characteristic wind actions on land-based structures, their components and appendages.


BS EN ISO 6946:2017  Building components and building elements. Thermal resistance and thermal transmittance. Calculation methods

Rainwater able to reach the waterproofing layer on an inverted roof will absorb heat from the underlying structure and affect the thermal performance of a roof system. Therefore, the initial U-value of a roof system must also be corrected by adding a rainwater correction factor according to Section 7 and Annex D.4 of BS EN ISO 6946:2007.

The corrected U-value of an inverted roof will be dependent on the amount of rainfall falling on the roof – which means it will be location specific – and the proportion of rainwater which can reach the waterproof layer.

Radmat MK, reduces the proportion of rainwater reaching the waterproofing, helping to minimise heat loss due to rainwater cooling and therefore the amount of insulation required.


BS 8579: 2020 Guide to the design of balconies and terraces

Modern medium and high-rise residential development in cities providing outdoor amenity space for occupants in apartments through the incorporation of balconies and roof terraces.  This British Standard provides clarification on what Approved Document B Fire safety Volume 1: Dwellings refers to as “specified attachment” on relevant buildings.  The standard provides guidance for harmonizing the drivers of safety, longevity, inclusive access and weathering.


DD ENV 1187:2002 Test methods for external fire exposure to roofs

This standard specifies four methods for determining the performance of roofs to external fire exposure. Test 4 is relevant to the United Kingdom and leads to the (t4) classification.  The tests assess the fire spread across the external surface of the roof, fire penetration and the production of flaming droplets or debris falling from the underside of the roof or from the exposed surface.


BS EN 13501-1:2018 Fire classification of construction products and building elements – Classification using data from reaction to fire tests

This standard provides the reaction to fire classification procedure for all construction products, including products incorporated within building elements with the exception of power, control and communication cables which are covered by EN 13501-6.  Products are considered in relation to their end use application. This document applies to three categories, which are treated separately in this document: construction products, excluding floorings and linear pipe thermal insulation products; floorings; linear pipe thermal insulation products.


BS EN 13501-5:2016 Fire classification of construction products and building elements – Classification using data from external fire exposure to roofs tests

This European Standard is to define a harmonized procedure for the classification of roofs/roof coverings exposed to external fire. This classification is based on the test methods listed in Clause 5 and the relevant field of application procedures.  DD ENV 1187


ETAG 031

European Technical Approval Guideline (ETAG) 031-1 –sets out performance requirements for inverted roof insulation kits. ETAG031 advises that the declared thermal conductivity for insulation should be corrected due to the special nature of the inverted roof application and the fact insulation is being used in exposed rooftop conditions

ETAG 031-1 states that possible water absorption over time is determined by evaluating the performance of the insulation in respect of two mechanisms for water absorption: by diffusion and post freeze/thaw. Corrected thermal values are determined by assessing the total water absorption potential – and it is these corrected values which ETAG 031-1 advises should be used in any U-value calculations for inverted roof systems.

ProTherm G, ProTherm S and ProTherm Quantum inverted roof insulation systems have a closed cell structure which results in low water pick-up over time, despite the rigorous conditions on exposed rooftops.



The ISO 9000 family addresses various aspects of quality management and contains some of ISO’s best known standards. The standards provide guidance and tools for companies and organizations who want to ensure that their products and services consistently meet customer’s requirements, and that quality is consistently improved.

Standards in the ISO 9000 family include:
– ISO 9001:2008 – sets out the requirements of a quality management system

– ISO 9000:2005 – covers the basic concepts and language

– ISO 9004:2009 – focuses on how to make a quality management system more efficient and effective

– ISO 19011:2011 – sets out guidance on internal and external audits of quality management systems.



The ISO 14000 family of standards provides practical tools for companies and organizations of all kinds looking to manage their environmental responsibilities.

ISO 14001:2004 and its supporting standards such as ISO 14006:2011 focus on environmental systems to achieve this. The other standards in the family focus on specific approaches such as audits, communications, labelling and life cycle analysis, as well as environmental challenges such as climate change.

ISO 14001:2004 sets out the criteria for an environmental management system and can be certified to. It maps out a framework that a company or organization can follow to set up an effective environmental management system. It can be used by any organization regardless of its activity or sector.

Using ISO 14001:2004 can provide assurance to company management and employees as well as external stakeholders that environmental impact is being measured and improved.