Stone Restraint

ACS Stone Restraints give lateral restraint against wind and imposed loads on stone façades. Each is made to order with a one-way or two-way dowel (6mm as standard) embedded at least 25mm into the stone. Share your stone size, bond pattern and substrate with our technical team and we’ll confirm the right restraint.

Restraint To Suit Your Site Tolerance

Our C-P-HU variant provides a single hole fixing into the stone for a simple installation, with minimal site tolerance. Where a greater range of site tolerance is needed, our M-P-HU variant offers a 3-hole end, accommodating a wider range of lengths if site conditions differ from design. Both single and multi hole ends are also available with a slotted upstand (C-P-SU and M-P-SU) to allow for additional vertical tolerance, though this typically requires a larger section size of tie.

Dowel And Fixing Options To Suit Any Substrate

Restraints are available with a welded, loose or capped dowel, depending on your installation sequence, supplied as a straight plain dowel or self-clinching threaded dowel to suit the application. Fixing back to the structure varies by substrate – typically a 6.3mm stainless concrete screw or M6 expansion anchor into concrete, an M5.5 self drilling Tek screw into steel, a 6.3mm stainless concrete screw into blockwork, or M6 coach or wood screws into timber. For substrates such as blockwork, site testing is recommended to validate capacities.

Want to learn more about our Stonework Systems?

Specifying restraint for natural stone cladding or coping? Share your stone size, bond pattern and substrate with our Technical Engineering Team and we’ll confirm the right restraint configuration for your project.

0113 391 8200

info@acsstainless.co.uk

Get in touch

Key Specification Details

Lateral restraint against positive and negative wind loads and imposed loads on stone façades
Bespoke and made to order to BS 8298:2020, with full design calculations available on request
One-way or two-way dowel (welded, loose or capped) embedded at least 25mm into the stone, 6mm as standard with other sizes on request
Single hole (C-P-HU) or 3-hole (M-P-HU) fixing ends, with slotted upstand options (C-P-SU / M-P-SU) for extra vertical tolerance
Positioned at 1/5 points for stack bonded stones, 1/4 points for stretcher bonded stones, or at least 75mm from the stone edge, with up to four fixing points per stone in horizontal or vertical joints
Grade 304 stainless steel, with Grade 316 on request, CCPI-assessed

More Than a Manufacturer. A Compliance Partner.

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.

Compliance Through Expertise

Assurance Through Transparency

Performance & Innovation

CPD Series

Join the ACS CPD series to enhance your knowledge and skills across a variety of construction based topics, ensuring you stay up to date with the latest products on the market and meet the latest regulatory requirements. We offer a range of CPDs, many fully certified, with an official CPD certificate in recognition.

Tested, Certified, Trusted

ACS Stone Restraints are designed to BS 8298:2020, and have achieved a Code for Construction Product Information (CCPI) mark for clear, accurate product information.

Download NBS/BIM

Access the NBS specification and BIM resources for this product to support your project planning, specification and design.

Request the CAD file

Need the CAD file for this product? Submit a request using our form and our team will be in touch.

Technical Data Sheet

The ACS Stone Restraints Technical Data Sheet covers product highlights, product summary, restraint types (C-P-HU, M-P-HU, C-P-SU, M-P-SU), dowel options (welded, loose, capped), and recommended fixings by substrate.

FAQs

How is the right stone restraint fixing selected for my substrate?

ACS recommends a suitable fixing based on the substrate – typically a 6.3mm stainless concrete screw or M6 expansion anchor into concrete, an M5.5 self drilling Tek screw into steel, a 6.3mm stainless concrete screw into blockwork, or M6 coach or wood screws into timber. For substrates such as blockwork, site testing is recommended to validate capacities.

What lengths is Stone Restraint supplied in?

Stone Restraints are always bespoke, manufactured to suit the specific requirements of each project. Lengths typically run from 50mm up to 300mm.

What's the difference between a single hole and 3-hole restraint end?

The single hole (C-P-HU) end offers a simple fixing with minimal site tolerance. The 3-hole (M-P-HU) end accommodates a wider range of lengths where a greater degree of site tolerance is needed.

What's the difference between Stone Restraint and Stone Support?

Stone Restraint provides lateral restraint against wind loads and other imposed loads, while Stone Support carries the dead load of the stone back to the structure. Most stone façades need both, working together.

Stone Restraint

Restraint To Suit Your Site Tolerance

Dowel And Fixing Options To Suit Any Substrate

Want to learn more about our Stonework Systems?

0113 391 8200