Kerf & Restraint Fixed Stone Cladding
Kerf & restraint fixed stone cladding
Britain's long and complex geological history has produced a diverse range of stone types, many of which have been quarried for building purposes over the centuries. Some of the country's building stone quarries have operated continuously since earliest times.
Stone cladding facade systems provide a natural finish to complement and harmonise with their surroundings, often in conservation areas among long standing traditionally built stone projects.
The growth of natural stone rainscreen has evolved, with clients and architects still looking to achieve a natural stone facade, but with the benefits of reduced weight, construction programmes, and associated costs of using a thinner stone.
In conjunction with the requirement for a reduced build time and costs, new through wall build ups have evolved. These new construction methods have facilitated the growth of rainscreen cladding systems which are lightweight, quick to install and well suited to these newer methods of construction.
Natural stone rainscreen tiles can range from 20 – 40mm thick depending on the flexural strength of the stone selected.
The most popular stone type to be used on rainscreen systems in the UK are limestones. Jura and Moleanos limestones are predominantly used due their superior flexural strength.
Sandstones, including UK sourced options such as Catcastle Buff and Stanton Moor are also extensively used. Care must be taken when selecting the stone type as many stones do not have an adequate flexural strength to make them self-supporting/spanning. Please get in touch and we will put you in contact with the relevant specialist to assist with your stone selection.
A kerf restraint system is a cost-effective ventilated rainscreen facade solution offering an extensive range of natural stone finishes.
The kerf and restraint clips are a method of fixing stone cladding which offer designers and installers a positive fix to secure the panel mechanically in place. The kerf is cut into the top and bottom edge of each stone and the clip locks the tile in place and restrains its movement.
The planners appreciated what we had developed with Taylor Maxwell and the contractor could see it was a high quality product which worked within our budget."
Architect- Falconer Chester Hall
Lightweight kerf system /
Stone with a higher flexural strength may be used in 20 and 30mm thickness', which suits a Lightweight Kerf System.
The lightweight kerf system system has a 90degree horizontal kerf running along the edges of the stone. The panels are secured to the lightweight kerf system vertical rail using a one piece, four-way stainless steel clip attached by Tek screws.
Heavyweight kerf system /
Stones with a lower flexural strength requires a thickness of between 30/40mm, which requires a more robust restraint provided by the heavyweight kerf system.
The panels are secured to the heavyweight kerf system vertical rail using a two-piece stainless steel clip. This is achieved by using the heavyweight kerf system tool. The system also benefits from neoprene strips which eradicate wind rattle and assists with impact resistance.