Technical Data Sheets
General Guidance
Cavity Wall Ties
ACS stainless steel cavity wall ties tie the outer masonry leaf back to the inner leaf on residential, commercial, mixed-use and high-rise projects across the UK. Made from Grade 304 or 316 austenitic stainless steel, every tie is tested to BS EN 846, UKCA, CE+UKNI, and CE marked, A1 non-combustible, Lucideon tested and CCPI-assessed. Two standard products cover most cavities, with bespoke configurations available from 50mm to 400mm.
ACS 2000 Range. Type 1, for cavities up to 225mm.
Two Part Wall Tie. Type 2 capacity to 300mm, suitable for cavities up to 400mm.
Technical Data Sheets
General Guidance
ACS 2000 Range Wall Tie
Key Specification Details
- Type 1 heavy duty cavity tie to PD 6697, suitable for buildings at any height, altitude or location in the UK. Multi-purpose, for use as a cavity tie, a movement tie with debonding sleeve (+/-10mm in-axis movement, 100mm or 125mm sleeves) or a shear tie at collar jointed walls
- Suits cavities from 50mm to 225mm, in seven lengths from 200mm to 350mm in 25mm increments
- Low 19mm² cross-section for reduced thermal transfer, with an integrated drip to stop water crossing the cavity and clear embedment markings at 62.5mm
- Installed at 900mm horizontal and 450mm vertical centres, staggered, reducing to 225mm around openings and unbonded edges
- Grade 304 (1.4301) or 316 (1.4401) austenitic stainless steel, A1 non-combustible without testing to 96/603/EC, UKCA, CE+UKNI, and CE marked to BS EN 845-1, Lucideon tested and CCPI-assessed
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Two Part Wall Tie
The ACS Two Part Wall Tie is built for large cavities from 150mm to 400mm, and engineered to take the long, hazardous protruding ties out of independent-leaf construction. It achieves Type 2 capacity to PD 6697: 2019 for cavities up to 300mm, with Type 2 performance still achievable at cavities up to 400mm at increased tie density.
The tie’s unique connection feature prevents water crossing from the outer to the inner leaf even when installed at up to 5 degrees in an unfavourable direction, making it well suited to high-rise and larger-cavity construction where long protruding ties would otherwise present installation and safety challenges during independent leaf construction.
The two-part design allows the inner section to be built into the blockwork first, leaving a short, slotted connection exposed for the outer section to connect to during construction of the outer leaf. This eliminates the need for long protruding ties that can cause injury and are susceptible to damage on site.
Key Specification Details
- Type 2 capacity to PD 6697:2019 for cavities up to 300mm, with Type 2 performance achievable to 400mm at increased density
- Two-part design for cavities from 150mm to 400mm, with outer sections in 11 lengths from 150mm to 400mm in 25mm increments and inner sections in 170mm or 220mm
- Unique connection feature resists water crossing the cavity, even at a 5 degree unfavourable angle
- Requires 62.5mm embedment in both leaves and a minimum 10mm mortar joint
- Installed at 900mm horizontal and 450mm vertical centres, staggered, or 600 x 450mm to keep Type 2 capacity to 400mm, reducing to 225mm vertical centres within 225mm of openings and unbonded edges
- Grade 304 (1.4301) austenitic stainless steel, A1 non-combustible without testing to 96/603/EC, tested to BS EN 845-1, Lucideon tested and CCPI-assessed
Download NBS/BIM
Access the NBS specification and BIM resources for this product to support your project planning, specification and design.
Bespoke Cavity Wall Ties
Where standard cavity widths or substrates do not suit the detail, ACS can manufacture bespoke wall ties to project specification. Our in-house engineering team works directly with architects, structural engineers and contractors to confirm lengths, embedment, drip-detail position and any debonding requirement.
Bespoke ties are produced from the same Grade 304 or Grade 316 austenitic stainless steel, UKCA marked to BS EN 845-1, and supplied with full technical calculations for the bespoke configuration.
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Every ACS customer benefits from ACS Assured – our framework built on three pillars: Compliance Through Expertise, Assurance Through Transparency, and Performance & Innovation. From Gateway 2 documentation to full product traceability and sustainable manufacturing credentials, it’s built into everything we supply.
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Restraint Ties and Fixings CPD
ACS runs a CPD-certified seminar on restraint ties and fixings, hosted by Strategic Specification Director Paul Ruding and available online or in person. It covers brick-to-block ties for high-rise buildings, light gauge steel frames, the ACS FrameFix channel system and stone tie options. Book your place on our Wall Tie CPD page or get in touch to arrange a session for your team.
Tested, Certified, Trusted
Our cavity wall ties are independently Lucideon tested, UKCA, CE+UKNI, and CE marked, and A1 non-combustible without need for further testing, in accordance with document 96/603/EC.
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Technical Data Sheet
The ACS Cavity Wall Tie Technical data sheets cover Lucideon-verified loading in accordance with PD6697, UKCA, CE+UKNI, and CE marked, A1 non-combustibility, and full CCPI-certified specification information across the 2000 Range and Two Part wall tie systems.
FAQs
What is a cavity wall tie?
What is the difference between Type 1 and Type 2 ties?
What cavity width does the ACS range cover?
The ACS 2000 Range covers cavities from 50mm to 225mm with a Type 1 tie. The Two Part Wall Tie covers cavities from 240mm to 400mm. For cavities outside these ranges, bespoke ties are manufactured to project specification.
Can the ACS 2000 Range also be used as a movement tie?
Yes. The 2000 Range is a multi-purpose tie: fitted with a debonding sleeve it acts as a movement tie allowing in-axis movement of +/-10mm, and it can also be used as a shear tie at collar-jointed walls. See the Movement Wall Ties page for details.
