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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 6229:2003

This British Standard provides recommendations on the design and application of flat roofs with continuously supported roof coverings. It covers weathertightness, drainage, thermal design, sound insulation, condensation control, structural support, fire precautions, maintenance and repair.  The recommendations are applicable to terraces, podia, parking decks and green/garden roofs.  This code of practice is applicable to roof coverings at a pitch not greater than 10° to the horizontal. The recommendations given in this standard may also be applied to roofs with slopes greater than 10°, but for steep roofs many of the recommendations may not apply. This code of practice does not apply to roofs with self-supporting coverings, cold stores and high temperature enclosures, or to slated or tiled roofs.


BS 8217:2005

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

This standard, entitled ‘Flexible sheets for waterproofing. Bitumen, plastic and rubber sheets for roof waterproofing. 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.

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 6946:2007

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.


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.