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Manufactured by the UK owned company James Jones, this structurally engineered timber joist combines high-grade softwood with an engineered composite panel, and is suitable for both floor and flat roof structures.
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| JJI Joists are used as an innovative alternative to conventional construction timber offering many design and performance advantages. |
| The lightweight and planed joists are available in lengths up to 12 metres. They provide an excellent strength to weight ratio, are straight and uniform and resist shrinking and warping. |
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| Robinson Manufacturing is one of the UK's largest suppliers of JJI Joists, with a production facility able to supply 5,000 floors per annum. This together with purpose built production equipment and design software, helps us to deliver an unrivalled level of service to our customers. |
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Using a comprehensive floor design and layout software package we are quickly able to determine the most cost effective joist solution.
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| Our designer engineers can then accurately produce detailed layout drawings, installation details, material call-offs, calculations and design quotations for virtually any building footprint. |
| We pride ourselves on being flexible in our approach, and quick to interpret our customer's requirements ensuring that all fixing and service details comply with Building Regulations. |
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| Our sales and technical support staff have many years experience in the timber engineering industry. Working closely with architects, engineers, contactors and surveyors, we are able to offer expert advice from initial building development stages through to co-ordinated supply of the finished product. |
| We are also able, if requested, to offer on-site support and training for the products we supply. |
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Joist Type
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Houses
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Dead load up to 0.75kN/m2
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Joist Centres (mm)
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300
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400
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480
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600
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JJI 220 A+
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4675
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4325
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4115
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3821
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JJI 220 B+
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5086
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4700
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4468
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4197
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JJI 220 C
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5232
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4833
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4593
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4312
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JJI 220 D
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5651
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5212
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4948
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4640
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JJI 245 A+
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4970
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4599
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4274
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4116
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JJI 245 B+
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5390
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4982
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4376
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4451
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JJI 245 C
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5559
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5136
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4737
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4584
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JJI 245 D
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6010
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5545
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4881
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4938
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JJI 300 A+
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5577
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5162
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5265
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4622
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JJI 300 B+
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6002
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5550
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4913
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4961
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JJI 300 C
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6229
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5756
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5473
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5142
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JJI 300 D
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6761
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6240
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5927
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5561
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These tables serve as guidance only
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JJI Joists have been successfully tested in accordance with:
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| BS476: Part 21: 1987 - 30 Minute Fire Resistance |
| BS476: Part 21: 1987 - 60 Minute Fire Resistance |
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Engineered to give superior strength, yet lighter weight
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Provides a complete design solution for most types of building application
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Extremely stable and easier to handle on site
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Easy to fix and nail into, thus quicker to install
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Is less prone to splitting and reduces building maintenance
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NHBC approved for all current building regulations |
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Long spans which lend themselves to flat roof structures |
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What is a JJI Joist?
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| A JJI Joist is a structually engineered timber joist, combining high-grade softwood flanges, with an engineered composite panel web. |
| Can JJI Joists be used in the construction of roofs? |
| JJI Joists can be used in the design of both flat and pitched roofs. |
| What fire protection do JJI Joists offer? |
| JJI Joists offer a variety of methods of achieving both 30 minute and 60 minute fire protection. Fire tests were carried out by Chiltern International Fire and certificates can be downloaded from the JJI website. |
| Can I use JJI Joists in floors to meet 'Part E' for flats? |
| JJI-Joists can be used in both intermediate and separating floors that comply with Building Regulation requirements for Resistance to the Passage of Sound (Part E) provided appropriate detailing is used. |
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| With the recent further investment in manufacturing equipment at our two production facilities in Wellingborough, Robinson Manufacturing continue to produce high volume, accurate, high quality products on a consistent basis, to meet our customers needs. Our current joist facilities include: |
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Two CNC push-cut saws
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Two cross-cut saws
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| With our commitment to reducing the impact our industry has on the environment, we ensure that all our equipment is environmentally efficient and that our waste timber is minimal. |
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| Robinson Manufacturing use a combination of our own fleet of vehicles along with tried and tested contract haulage companies to distribute our engineered products nationwide. |
| All our drivers are trained to today's required standards for loading, storage and handling of joists to avoid product and site damage and to minimise on-site safety hazards |
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Robinson Manufacturing - Floor Division
27-29 Don White Road,
Ogee Business Park,
Finedon Road Industrial Estate,
Wellingborough,
Northants,
NN8 4FT
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