Designed to block fire and smoke, the ARC Cavity Stop Sock Fire Barrier fits securely in external masonry wall cavities. Suitable for vertical or horizontal use, it meets the requirements of Approved Document B. With a fire rating of up to 4 hours and built from non-combustible rockfibre mineral wool, this barrier enhances building safety. Its 1200mm length ensures wide coverage, helping to close cavities at eaves level and contain fire spread within the cavity space.
Key Features
Length: 1200mm
Insulation: Non-combustible rockfibre mineral wool
Thermal conductivity: 0.037W/mK
Fire Rating : 4hrs with EN1366-4 of Test standard
Orientation : Suitable for vertical or horizontal cavities
Akor
Insulation
Size/Color/Pack
50mm Cavity 65mm x 65mm (40/pack) – Red
100mm Cavity 120mm x 100mm (20/pack) – Green
130mm Cavity 140mm x 120mm (15/pack) – Blue
150mm Cavity 160mm x 120mm (12/pack) – Blue
{PRODUCT_DESCRIPTION}
Delivery is free to Mainland England and Wales. Deliveries are chargable to Scotland.
Once the order is placed, our courier will call you within 3 working days to arrange a delivery date. If you do not hear from the courier within 3 days, please get in touch with us. The majority of deliveries are made within 7 days, occasionally a little longer during peak periods.
Deliveries are made between 08:00 and 18:00 on the day, we request the driver calls you one hour before with an advised time.
Delivery is made via a kerbside tail lift lorry, we cannot deliver to sloping ground as the tail lift must be able to lay flat.
The road must be wide enough for a lorry to fit down and free from obstruction, if there are any access restrictions, please contact us.
Deliveries must be signed for, please report any damages to us within 24 hours.
We offer all bricks with a tail lift offloading service, Please familiarise yourself with the information below.
Crane offloading is available as a premium service for some bricks.
FAQ
All of our C16 and C24 graded timber is regularised
Regularised timber is timber that has been processed to have a uniform shape and size. This means that the wood has been sawn and planed to remove any irregularities and ensure that each piece of wood has consistent dimensions. Regularised timber is often used in construction, particularly in the framing of buildings, as it is easier to work with and can be more efficiently installed than irregularly shaped timber.
We have one of the largest ranges of timber lengths, dimensions and grades available to buy online.
The variation you require will determine the exact lead time and delivery method.
Most orders arrive within 3-4 days, the maximum is 7 days. Please get in touch before you order if you need a specifc delivery date.
Delivery charges vary by postcode. To find out the delivery charge, add the item(s) you require to your basket and select CALCULATE SHIPPING at the bottom of the page.
Some orders are delivered on our own vehicles based in Leicestershire and Cheshire. We also use carriers including Yodel and Tuffnells. For some sizes and locations we use regional distributors.
If you'd prefer crane offloading rather than tail lift vehicle offloading for your brick order then this service is available for the majority of bricks that we sell. Charges are shown at checkout.
For deliveries of less than 6 packs then Taillift offloading is normally a more cost effective option
Downloadable information can be found here:
Armstrong Cheshire supply the full range of Catnic Lintels. If you don't see the lintel you need on our website, choose from the Catnic Lintel Selector Brochure and give us a call 01625 322269
Downloadable information can be found here:
Designed to block fire and smoke, the ARC Cavity Stop Sock Fire Barrier fits securely in external masonry wall cavities. Suitable for vertical or horizontal use, it meets the requirements of Approved Document B. With a fire rating of up to 4 hours and built from non-combustible rockfibre mineral wool, this barrier enhances building safety. Its 1200mm length ensures wide coverage, helping to close cavities at eaves level and contain fire spread within the cavity space.
Key Features
Length: 1200mm
Insulation: Non-combustible rockfibre mineral wool
Thermal conductivity: 0.037W/mK
Fire Rating : 4hrs with EN1366-4 of Test standard
Orientation : Suitable for vertical or horizontal cavities
Akor
Insulation
Size/Color/Pack
50mm Cavity 65mm x 65mm (40/pack) – Red
100mm Cavity 120mm x 100mm (20/pack) – Green
130mm Cavity 140mm x 120mm (15/pack) – Blue
150mm Cavity 160mm x 120mm (12/pack) – Blue
{PRODUCT_DESCRIPTION}
Delivery is free to Mainland England and Wales. Deliveries are chargable to Scotland.
Once the order is placed, our courier will call you within 3 working days to arrange a delivery date. If you do not hear from the courier within 3 days, please get in touch with us. The majority of deliveries are made within 7 days, occasionally a little longer during peak periods.
Deliveries are made between 08:00 and 18:00 on the day, we request the driver calls you one hour before with an advised time.
Delivery is made via a kerbside tail lift lorry, we cannot deliver to sloping ground as the tail lift must be able to lay flat.
The road must be wide enough for a lorry to fit down and free from obstruction, if there are any access restrictions, please contact us.
Deliveries must be signed for, please report any damages to us within 24 hours.
We offer all bricks with a tail lift offloading service, Please familiarise yourself with the information below.
Crane offloading is available as a premium service for some bricks.
All of our C16 and C24 graded timber is regularised
Regularised timber is timber that has been processed to have a uniform shape and size. This means that the wood has been sawn and planed to remove any irregularities and ensure that each piece of wood has consistent dimensions. Regularised timber is often used in construction, particularly in the framing of buildings, as it is easier to work with and can be more efficiently installed than irregularly shaped timber.
We have one of the largest ranges of timber lengths, dimensions and grades available to buy online. The variation you require will determine the exact lead time and delivery method.
Most orders arrive within 3-4 days, the maximum is 7 days.
Please get in touch before you order if you need a specific delivery date.
Delivery charges vary by postcode. To find out the delivery charge, add the item(s) you require to your basket and select CALCULATE SHIPPING at the bottom of the page. Some orders are delivered on our vehicles based in Leicestershire and Cheshire. We also use carriers including Yodel and Tuffnells. For some sizes and locations, we use regional distributors.
If you'd prefer crane offloading rather than tail lift vehicle offloading for your brick order then this service is available for the majority of bricks that we sell. Charges are shown at checkout.
For deliveries of less than 6 packs then Taillift offloading is normally a more cost effective option
Downloadable information can be found here:
Armstrong Cheshire supply the full range of Catnic Lintels. If you don't see the lintel you need on our website, choose from the Catnic Lintel Selector Brochure and give us a call 01625 322269
Fire-resistant cavity barrier made from rockfibre mineral wool. Suitable for vertical and horizontal use in masonry walls. Rated up to 4 hours fire resistance with low thermal conductivity.
ARC Cavity Stop Sock Fire Barrier - 50mm Cavity 65mm x 65mm (40/pack) – Red
is backordered and will ship as soon as it is back in stock.
Couldn't load collection availability
Delivery charges will vary depending on your location.
To find out delivery cost to your postcode, add the products your require to your basket and then review your basket, entering the delivery postcode
We look to dispatch all products same-day where possible, we use a close network of couriers we have worked alongside for a number of years and will share any and all shipping updates with you directly.
Designed to block fire and smoke, the ARC Cavity Stop Sock Fire Barrier fits securely in external masonry wall cavities. Suitable for vertical or horizontal use, it meets the requirements of Approved Document B. With a fire rating of up to 4 hours and built from non-combustible rockfibre mineral wool, this barrier enhances building safety. Its 1200mm length ensures wide coverage, helping to close cavities at eaves level and contain fire spread within the cavity space.
Key Features
Length: 1200mm
Insulation: Non-combustible rockfibre mineral wool
Thermal conductivity: 0.037W/mK
Fire Rating : 4hrs with EN1366-4 of Test standard
Orientation : Suitable for vertical or horizontal cavities
Designed to block fire and smoke, the ARC Cavity Stop Sock Fire Barrier fits securely in external masonry wall cavities. Suitable for vertical or horizontal use, it meets the requirements of Approved Document B. With a fire rating of up to 4 hours and built from non-combustible rockfibre mineral wool, this barrier enhances building safety. Its 1200mm length ensures wide coverage, helping to close cavities at eaves level and contain fire spread within the cavity space.
Key Features
Length: 1200mm
Insulation: Non-combustible rockfibre mineral wool
Thermal conductivity: 0.037W/mK
Fire Rating : 4hrs with EN1366-4 of Test standard
Orientation : Suitable for vertical or horizontal cavities
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Trusted Protection in Wall Cavities
The ARC Cavity Stop Sock is made for use in external masonry wall cavities, helping prevent fire and smoke from spreading. It’s especially suited to buildings where cavity barriers are required by regulation.
Each 1200mm barrier can be installed either vertically or horizontally, giving flexibility across building designs. The product helps meet building control standards and fits securely into the cavity without fuss.
4-Hour Fire Rating You Can Rely On
Tested to EN1366-4 standards, the ARC Cavity Stop Sock holds a fire resistance rating of up to 4 hours. That’s added time for safe evacuation and damage control.
Non-Combustible Mineral Wool Core
The core of the product is made from dense rockfibre mineral wool. It resists high temperatures without melting, thereby helping to maintain its structure under intense heat.
Insulates While Protecting
Beyond fire safety, the barrier offers a thermal conductivity of 0.037W/mK. This supports energy efficiency by reducing heat loss through wall cavities.
Built to Comply with Approved Document B
Specifically recommended in Approved Document B, this cavity stop sock is a trusted choice for specifiers and contractors. It helps close cavities at roof level and around windows, making sure your build stays compliant.
Have a question?
If you have any questions about our products or would like to learn more about our shipping options please feel free to contact one of our team today.
