Restraints for Stone Cladding
Reference should be made to BS 8298-2: 2020 “Design and installation of natural stone cladding and lining”, when selecting ties for restraining stone cladding. Restraints should be designed to resist wind loads and any imposed loads from, for example, window cleaning equipment.
Each stone will normally be restrained in four places, two at the top and two at the bottom. These are usually situated in the horizontal joints. The restraints should be located in pre-formed mortises or holes positioned in the centre of the thickness of the stone panel, and located at 1/4 points for half bonded stones and 1/5 points for stack bonded stones. Restraints should be kept at least 75mm from any corner with the peripheral distances between any two restraints not exceeding 1200mm.
The embedment of restraint dowels and lips into the stone should be at least 20mm. To achieve this, lipped ties (LPBs) have a 25mm downstand and dowelled ties (DPBs and YPBs) have 60mm long dowels.
Drip Positions
Due to the wide varieties of design cavity and stone and insulation thickness, it is not possible to standardise the position of any required drip. If a drip is required (e.g. YDB) please specify the position clearly, indicating from which end of the tie the measurement is taken.
Standard Stone Fixings
YDB
Min length 120mm
6x60mm loose dowel
YPB
Min length 40mm
6x60mm loose dowel
YP21
Min length 40mm
6x60mm loose dowel
MP21
Min length 70mm
6x60mm loose dowel
MDS
Min length 140mm
6x60 loose dowel
MPB
Min length 70mm
6x60mm loose dowel
LP21
Min length 35mm
LPB
Min length 40mm
LPL
Min length 75mm
ZDS
Min length 110mm
DP21
Min length 40mm
6x60mm welded dowel
DPB
Min length 40mm
6x60mm welded dowel
DDS
Min length 120mm
6x60mm welded dowel
Wire Ties
Wire ties are manufactured from 3mm and 5mm diameter wire for the fixing of thin marble.
Ancon Push–Off Bolt
This fixing provides the centre of stone panels with additional resistance to the effects of impact loads, blast loads and positive wind pressure. Its mechanical expander fixes securely into the inner leaf while the neoprene pad cushions the external stone panel and prevents rattling. The Push-Off Bolt is supplied in a variety of lengths to suit cavities from 100 to 200mm and can be fixed to both concrete and blockwork.
Ancon 2000
Ancon 2000 restraint fixings are simple and secure method of fixing thin facing slabs (20-40mm).
Latest News
Leviat Launches New 300mm Type 4 Wall Tie for Wider Cavities
Leading construction accessories manufacturer, Leviat, announces the release of its new Ancon Staifix HRT4 300mm Wall Tie designed for use in wider walls with cavities ranging from 151-175mm. The addition of this product to the existing range will help specifiers and builders to meet the latest Part L regulations and achieve the more stringent U-values and building fabric requirements in the upcoming Future Homes Standard.
Enhanced Ancon IHR Head Restraints Now Accommodate 100mm Gaps Due to Customer Demand
Due to customer demand and changes to fire regulations, Leviat have successfully re-engineered the Ancon IHR range of internal head restraints, now accommodating gaps at the wall head of up to 100mm, extending the previous maximum of 75mm.