Atal and technical partner Naue supply Bentofix® BFG 5000 Thermal Lock geosynthetic clay liners (GCLs), also known as geosynthetic clay barriers (GBR-C). The membrane consists of needle-punched, reinforced composites that combine two outer layers of durable geotextile and a uniform core of high-swelling powder sodium bentonite clay. It is manufactured under ISO 9001 regulations and is BBA certified.

BENTOFIX® BFG 5000 is a waterproofing barrier system which efficiently protects reinforced concrete structures, preventing the penetration of water and providing protection to the structure from attack by aggressive chemical substances present in the local surrounding soil.                                   

Atal Structural Waterproofing and Ground Gas Protection solutions in partnership with the Bentofix® range of products are suitable for almost any project where there is a need to contain or protect against water, ground gas or dampness including retaining walls, basements and water retaining structures specified as requiring Type A (Barrier) technology.

Strong and durable nonwoven geotextiles encapsulate and protect the layer of sodium bentonite powder, ensuring its long-term performance. Since Bentofix® BFG 5000 contains the highest quality sodium bentonite available, an immediate swelling following installation is ensured to safely self-seal any unexpected mechanical damages.

The Bentofix®  range of products includes everything required for reliable and long-lasting waterproofing solutions for below ground and water retaining structures, with a choice of membrane, mortars and ancillary products.

We pride ourselves on our high level of service, ensuring clear communication, responsibility for the design and bespoke CAD details.

During installation, we provide comprehensive onsite training where required and undertake regular site inspections to ensure that all materials are installed according to the specification details, industry best practice and data sheets; eliminating the ever-present risk of a substandard installation.

We also provide reports on installations upon request.


Because GCLs made with powdered bentonite can create a higher pressure within the geotextiles when they hydrate, they have an improved self-healing effect. (The increased pressure is because of the higher bulk density, with less space between the geotextiles.)

Small bentonite powder particles mean small spaces between the particles, therefore only a little water is needed to swell the first layer of the powder which slows down the movement of water into the remainder of the powder layer.

This means that powder-based systems give;

  • Instant sealing
  • They can be installed in the rain if required.

With granules, the pores (the spaces between the granules) are bigger, and water can move into the whole bentonite thickness causing the entire thickness to start swelling. The moisture content can quickly get past the 50% level, where this swelling can weaken the internal shear strength.  Such semi swollen GCLs are more prone to the footprint effect.

Bentofix® consists of an evenly distributed layer of high-swelling sodium bentonite powder encapsulated between two geotextile components that act as the sealing element. The main advantage of the powder bentonite is its uniform distribution and its immediate sealing performance. When hydrated and permeated under confinement with fresh water the bentonite layer swells and forms a gel-like low permeable barrier. Over a range of confining stresses, Bentofix® GCLs provide an excellent hydraulic performance even under high hydraulic gradient conditions.

Bentofix BFG is presently the only standard GCL, world-wide, which has two layers of powdered bentonite!

The Unique Advantages of Needle-Punched Bentofix BFG range.

Self-Sealing Overlap Joints

The unique Bentofix BFG 5000 GCL is manufactured with additional bentonite powder impregnated into the top geotextile covering the complete roll area.

There is no requirement for any extra bentonite to be placed in any overlap area on site installations due to the unique increased bentonite to bentonite jointing integrity.

Powder not Granules

Bentofix BFG 5000 has 5000g/m2 of bentonite powder spread over the whole area of the product to create self-sealing overlaps everywhere and to stop tracking.

Thermal Lock Technology

Bentofix is the only system available with thermal lock technology which permanently locks the needle-punched fibres of the nonwoven geotextile layer with the Bentofix carrier layer of GCL-types without PE coating and improves the hydraulic conductivity performance at low confining stresses.

This process significantly increases the pullout resistance of the fibres – a durability enhancing measure that ensures immediate fibre-strength during hydration.

All Weather Installation

When hydrated the sodium bentonite swells, it expands by over 16 times its dry volume. As the membrane is needle punched and thermally locked, the sodium bentonite is contained, preventing free swell. This means it can be installed in all weather conditions.

The material can be post or pre-applied and is installed without the need for primer and protection board.

If you need help or advice regarding any of the Type A, Type B, Type C  Structural Waterproofing options for your project or property, please contact us on 01495 717202. Alternatively you can contact us online and one of our team will get back to you.


Thankyou so much to atal for inviting me to todays meeting. I've learnt a whole lot about building physics, Type B Waterproofing and seen some really interesting case studies. The product looks absolutely fantastic and will do very well i'm sure of it!

- Adam Meyrick

I have worked with the guys at Atal for a number of years now whilst working for a number of companies & I would recommend them to other potential customers. I like their proactive approach, customer service, technical knowledge & speedy deliveries. 


If I ever have a problem or detail that needs resolving there is normally  someone available to help, even if it means them jumping in the car & visiting one of our sites at short notice!

- Richard Cleghorn MCIOB, P Chapman Construction

Great service on pricing enquiries for supply and Install, also repairing work - friendly and efficient staff.

- Simon Marsh

I would go with atal for waterproofing on any of my projects!

- Mike Mansfield, Intelle Construction

MJL Contractors Ltd have worked with Atal for a number of years now. We appreciate the professional & approachable manner offered by all of the staff at Atal & we know that if we have a problem we only have to pick up the phone & they will do their best to solve it. Prices are competitive & deliveries arrive as agreed.

- Richard Cleghorn MCIOB, MJL Group Limited

‘’Project architects, RDA liaised with Atal to bring forward a set of waterproofing and tanking details to ensure a water tight lower ground floor level within the setting of the original Bristol Evening Post print factory basement.  Atal provided us with design drawings and specifications founded on their product range and comprehensive industry experience, with which we were able to confidently develop our working drawing package.’’

- Rich Brown – Russ Drage Architects

‘’We had the fortune of being introduced to Atal via our main contractor. We were very pleased with the work they carried out. Although we had some challenges with some leaks with our new build Atal was able to identify the source of the problem very quickly and resolve it immediately. I would have no hesitation in recommending Atal.’’

- Prakash Patel – Hertz

‘’We have completed the groundworks package and almost completed the RC frame package at ‘’3 Glass Wharf’’ in Bristol on behalf of HMRC through Wates Construction. Throughout this project 4D Structures worked alongside Atal UK to ensure the waterproofing elements involved were installed to the highest standard. It was a pleasure working with Atal from design stage right through to the final sign off. They provide a brilliant service from design, supply of materials and also on site help and pre pour inspections. I would highly recommend them and look forward to working with them again in the near future.’

- Jordan Keyes – 4D Structures

‘’Atal have provided consistently quality products, on time at very competitive prices when compared to other high spec structural waterproofing brands. Customer Service has also been consistently, and the inclusion of detailed design documents tailored to specific projects goes above and beyond what other waterproofing companies are often willing to do. Overall, Atal have provided reliable, high quality products and customer service every time we have required their expertise’’ 

- Tom Luscombe – D Wall Construction Services

‘’We have been working with Dave and his team since the inception of the company and it is no surprise at all that the company continues to flourish. The services that Atal offers are unique and un-rivalled in the UK waterproofing industry, and it’s the reason why we as designers and our supply chain partners continue to use them. Keep up the good work Atal!’’

- Gavin Fairclough – Austin Partnership

“We always use Atal for their waterproofing expertise because of their technical ability to provide bespoke waterproofing design solutions tailored to our structural requirements in a proactive and efficient timescale”

- Matt Jones - Vale Consultancy

"Atal have a comprehensive product range, they always offer practical achievable solution and delivery on time results. David is very knowledgeable, and his positive approach is refreshing, hopefully we will continue to enjoy our mutually beneficial relationship, long into the future.”

- Simon Monk - McDermotts

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