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CDI has a small but experienced team.
Chris has a varied CV, but has spent the better part of the last decade in the construction industry advising on sustainability and assisting a number of projects to win national awards, he tends to lead the charge on the technical aspects of the specification of the various systems.
Paul has been in the industry since leaving school, having degree level qualifications in Construction Management and Construction Design, he spent many years working as a senior project manager and more recently with a screed manufacturer, he brings a breadth of knowledge to the team that is invaluable.
Barbara heads up the office and all things of the finance side of the business, with years of experience and an eye for detail that is second to none.
We are a close knit team, ready to help answer any question and provide a full service to any project, no matter how large or small, from a simple bathroom floor upgrade to a wet-room, through to mansion house conversions where acoustics, fire, underfloor heating and wet-room are all required, through to the most technical commercial applications where our systems can provide benefits.
We have a full complement of sales engineers based with our manufacturing partners to provide more detailed advice and calculations where appropriate.
Chris Holt – Managing Director.

Paul Larnach – Director
Barbara Larnach – Office Manager & Director
Case Studies
Self Build & Renovations
FAQs22
Ask CDI a Question
Ask CDI a Question-
Q
What are the Lewis Deck sheet sizes?
AQ: What sheet sizes are held in stock for delivery within a few days after order? A: We stock 2500mm and 1300mm sheets. These are all 630mm wide and 16mm deep. Deliveries are made via the pallet network directly to site. The smaller sheets are aimed at small bathroom renovation projects and can be supplied in small numbers via TNT. 2.5* and 1.3m sheets allow for the 100mm overlap to occur over a joist, with joist centres being either 300mm, 400mm, 600mm, 800mm*, 1200mm and 2400mm*. (*2.5m sheet only) For larger projects we are able to produce bespoke sheet sizes if required, please get in contact to discuss other options for sheet sizes.
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Q
Why don't my Lewis sheets interlock like they do in the video?
AQ: Why don't my sheets interlock like they do in the video? A: The sheets have two sides (one printed, one plain), the dovetails on either side are different widths, it is then necessary to alternate the sheets print up and then print down.
QIs this a question?
AIf it is, this is an answer.
Latest Blog
CDI 2026
2026 Exhibition Dates
20th January 2026
2026 might only be a couple of weeks old but we are already turning our attention to the first couple of exhibitions that we have organised for this year. This year we are hoping to be at more events than…
View AllIs Underfloor Heating Compatible With Carpet?
11th October 2024
At Every Exhibition We Get Asked Can You Have Underfloor Heating With Carpet? Hopefully here we explain why the answer to that is YES. With carpet providing a soft, luxurious feel to your home many people ask whether underfloor heating and carpet can go…
View AllCow Close Barn with Heat Pump and Underfloor Heating
26th May 2023
Paul M contacted us in early 2022 to discuss the use of the Lewis Deck system following a recommendation by his Ground Source Heat Pump system installer. We worked through the drawings and provided a quote, the Lewis Deck and…
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