Contact us to order: 08448 50 40 50
Contact us to order: 08448 50 40 50

ARC’s Party Wall System: The unique nine-part solution to fire safety

Grayson - ARC Party Wall System

Fire safety and improved thermal performance are imperative for construction industry professionals. As Part L of England and Wales’ building regulation states, a building’s fabric should make a ‘limited contribution to fire growth, including a low rate of heat release’.

Whilst there are no strict checks surrounding cavity fire barriers, the consequences of using ill-matched and low-quality fire-stopping products can be disastrous. That’s why ARC Building Solutions has developed a unique, nine-part system that is up to three times more effective as an edge seal than conventional systems.

ARC’s Nine-Part Party Wall System

Developed in conjunction with academia from Leeds Beckett University, ARC’s Party Wall System has been carefully designed to:

  • Meet stringent fire regulations
  • Prevent the spread of fire between semi-detached and terraced homes
  • Control the spread of smoke
  • Provide an effective seal at the party wall, thus reducing heat loss and enabling a zero U-value to be achieved


Each of the nine products within the system has been designed with simplicity and safety in mind, allowing ease of installation while enhancing fire performance.

1. T-Barrier Foundation

The first product in the ARC Party Wall System is the T-Barrier Foundation. This provides a fire, thermal and acoustic break at the junction between the external cavity and the party wall cavity at the foundation level. The ARC T-Barrier Foundation delivers four hours of fire integrity.

2. T-Barrier for Masonry

During bricklaying, the ARC T-Barrier for Masonry is installed within the party wall cavity. Once fitted, it provides a tight seal that offers up to four hours of fire integrity and minimises thermal bypass.

3. Cavity Stop Sock

The ARC Cavity Stop Sock restricts the spread of smoke and flames within the external cavity for up to four hours. The product is also easy to install thanks to its compression fit.

4. Spandrel Barrier

By sealing the top of the party wall cavity, the ARC Spandrel Barrier prevents fire from spreading between the party wall blockwork and the spandrel panel. When used in conjunction with the ARC T-Barrier (vertically), the ARC Spandrel Barrier achieves a zero U-value.

5. U-Barrier

The ARC U-Barrier provides fire-stopping properties between the spandrel panel and the underside of the roof covering. Compressing the ARC U-Barrier into place also creates a thermal conductivity of 0.037 W/mK.

6. T-Barrier Pitched Roof

Designed to provide a fire, thermal and acoustic barrier between the party wall and the roof covering, the ARC T-Barrier Pitched Roof component is fitted along the length of the roof pitch from soffit to apex, ensuring an effective and consistent barrier.

7. Soffit Slab

Made from non-combustible rockfibre mineral wool, the ARC Soffit Slab fills the void within the soffit to block any fire pathways. The ARC Soffit Slab also provides excellent thermal and acoustic properties at the party wall.

8. Eaves Insulator

Compared to traditional loft insulation, ARC’s Eaves Insulator reduces heat loss through the wall plate junction by up to 49%. That’s because the Eaves Insulator ensures junction details between the wall plate and ceiling are fully insulated.

9. Wired Tile Batten Barrier

The final component in ARC’s Party Wall System is the Wired Tile Batten Barrier which provides a non-combustible barrier between the tiles and the roof membrane. As with all products in ARC’s Party Wall System, it also acts as a thermal and acoustic break.

Improve the fire safety, thermal performance and quality of your builds

ARC’s Party Wall System provides an award-winning, third party accredited solution to fire safety. The simplified installation process and easy-to-identify bag colour of each product also ensures a smooth, trouble-free build.

Each product in the system can be used as a single component, however, to achieve zero U-value and meet stringent fire regulations, it’s recommended that builders use all nine products.

Watch this video to learn more about the ARC Party Wall System or contact your account manager on 08448 50 40 50 to order yours today.

Contact us to order: 08448 50 40 50

Contact Us


Unit 6 Edgar Ind Estate, Comber Road, Carryduff, Northern Ireland
02890 81 55 66


Unit 3 Invergyle Court, Ibrox Business Park, Glasgow
G51 2JR
0141 465 19 00


Magna 34 Industrial Park, Temple Road, Rotherham
S60 1FG
01709 786 100


Lombard House, 8 Lombard Road, London
SW19 3TZ
020 3576 3910

Grayson London is solely a Technical and Specification location.

Katie Wills

Regional Manager

Meet Katie Wills, our vibrant Regional Manager who finds joy in spending time with her family, keeping fit, and taking part in fun-filled challenges.

With an energetic and outgoing personality, Katie thrives on trying new things, even venturing into coasteering in 2023 with her son.

She’s not afraid to push boundaries, whether climbing mountains (previously done Kilimanjaro) for charity or conquering marathons and skydives. I wonder what challenge is next on the list?

When not on an adventure, Katie cherishes time with loved ones, embodying a sociable spirit that brings warmth to our team. 

Madelaine Pieterse

Regional Manager

Madelaine has always worked in construction so she knows her way around the industry, but she will often get lost in her own town.

Born in South Africa, Madelaine swapped the stunning sunshine in Cape Town for the cloudy charm of Belfast. We’re not sure what made her make this decision, starting a new life in Ireland isn’t for the faint-hearted.

Madelaine is mother to two sons 22 and 25 who she loves to spend her time with, watching them mature into handsome men.

Grayson GB - Jim Martin

Jim Martin

Regional Manager

Our regional manager Jim likes to pretend that he is ‘pure Scottish’ but secretly he’s half English. Now, we ‘dinnae ken’ why he’s proud of his Scottish ancestry, but each to their own!

Despite his Scottish routes, Jim is great at his job, there’s no denying that.

You won’t often see Jim cracking up in the office, but we suppose there isn’t a lot to laugh at up in Scotland so he’s probably out of practice.

Helen Gibson

Regional Manager

Helen spends most of her time playing with her orchestra. She claims that her biggest passion is music, but then again, her instrument of choice is the flute.

Playing her flute isn’t the only music that Helen makes, she is the proud owner of a big laugh that bounces off every corner of the office. More often than not, you will hear her laugh before you see her!

Helen’s a single girl, and enjoys meeting up with friends for nights out at the cinema, eating out and keeping the local Brew Dog in business!! She says she doesn’t drink much…. we know different!

Kevin Jagg

Operations Director

Kevin has been in the construction game for a long time, over 30 years! He worked at Grayson & Co back in 1993 and has unfortunately known Tony throughout this time. Now he’s decided to join the senior leadership after knowing Clare and Chris for 18 years.

At the weekend, Kevin enjoys meeting friends for a beer or 3 and loves to travel all over the world on cruises.

Clare Spivey

Sales & Marketing Director

Although she won’t admit it, Clare has been in the game a long time.

Supplying power tools and fixings was her first job in the construction industry. Due to this she has the ability to spot a tool a mile off.

Clare must have been a magician in a former life as her ability to spin plates is quite something. With a husband who works away, 2 kids with a shed load of activities, her taxi and cheerleading skills are on hand most evenings and weekends.

Clare and her family enjoy escaping to Filey, where they enjoy long walks on the beach and eating fish and chips. Clare loves her holiday home as there is absolutely no phone signal.

Henry Bareham

Specification Director

Henry’s takes great pride in his family, a wife to whom he’s absurdly lucky to have been married to for over 30 years. And two children in their 20’s, who now talk to him having managed their way through the teenage years.

Having left his pretend job of 15 years as a fully-fledged P.G.A qualified Golf Professional, Henry has managed his last 20 years + in construction within manufacturing, technical specification, and sub-contracting.

He spends his time away from work trying to re-kindle the talent he had a long time ago on the golf course, whilst also managing a keen interest in the gym, trying to maintain the muscle to body fat ratio in a good way.

Chris Bentley

Regional Manager

Chris’s claim to fame is working with both Tony and Clare for over 24 years, and still being alive to tell the tale. He’s been working for Grayson since day one!

Outside of the office, Chris has a passion for music and plays in a Brass Band. He’s performed at the Albert Hall, and recently performed at Soccer Aid for Unicef in front of 70,000 supporters at Old Trafford.

If he’s not playing music or working, Chris does also like to watch Barnsley FC which unfortunately, doesn’t put a smile on his face too often.

Tony Higson ​

CEO & Managing Director ​

Having two teenage daughters, Tony enjoys spending much of this time working away.

He also has an old wife and new a Doberman, therefore the only time people value him is in the office or on site.

As a Sheffield Wednesday fan, the poor fella doesn’t get any joy there either.

Tony has been the Managing Director of Grayson for nearly twenty-years. For all of this time he was also moonlighting for ACS. Again, holding down two jobs was the perfect excuse for not going home.  

In a previous life Tony used to play solders, however he has very few war stories due to the fact his job was to the fix equipment real soldiers used.

Tony’s biggest fear is retirement.