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Building Approvals

JJI-Joists, following exhaustive research and testing, have been awarded third party certification from BM TRADA Certification.

The BM TRADA Q-Mark is recognised by:

In 2009, JJJ-Joists gained the BM TRADA Q-Mark EWP-0001.

Quality Control & Quality Assurance

With any manufactured product, quality determines its success. It is for this reason that James Jones & Sons Limited, Timbers Systems Division maintains a thorough Quality Assurance program which enables us to achieve our goal of producing a consistent and uniform product of exceptionally high standards.

JJI-Joists are manufactured under a Quality Assurance Scheme which complies with BS EN ISO 9001:2008.

The BS EN ISO 9001:2008 scheme is audited by BM TRADA Certification who carry out routine surveillance visits.

About Trada

The Timber Research and Development Association (TRADA) - is an internationally recognised centre of excellence on the specification and use of timber and wood products.

TRADA is a company limited by guarantee and not-for-profit membership-based organisation. TRADA's origins go back nearly 70 years and its name is synonymous with independence and authority. Its position in the industry is unique with a diverse membership encompassing companies and individuals from around the world and across the entire wood supply chain, from producers, merchants and manufacturers, to architects, engineers and end users.

TRADA's aim is to provide members with the highest quality information on timber and wood products to enable them to maximise the benefits that timber can provide.

TRADA seek to achieve this aim through active and on-going programmes of information and research. Information is provided through their website, an extensive collection of printed materials and their training courses.

Visit the TRADA website.


On 1 January 2002 the UK Timber Frame Association (UKTFA) was launched to provide a strong, unified voice for the UK industry.

The UKTFA promotes timber frame to the construction industry and the public; provides information and guidance, both technical and consumer; and aims to ensure that all sectors of UK construction fully exploit the benefits of timber frame - speed of erection; thermal and acoustic excellence; durability; environmental friendliness; and design flexibility.

Visit the UKTFA web site.

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