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ACS manufacture a full range of wall ties produced from either 304 grade stainless steel or 316 grade stainless steel. ACS are also able to offer a range of galvanised wall ties on request.
The selection and positioning of wall ties depends on many factors including the type and height of a building, the location, cavity size and type of material to be restrained.
To help determine what type wall ties should be used, there are several documents that need to be consulted.
DD140: Part 2: 1987 Recommendation For The Design Of Wall Ties
This document provides recommendations for the design of wall ties for masonry and timber construction in the UK. There are 6 different categories of wall ties, which are determined by strength, function and use. Types 1 to 4 are for masonry to masonry ties, and types 5 and 6 are for use in timber frame construction.
BS5628: The Use Of Masonry: Part 1: 2005
This gives details on the embedment, length of tie, density and positioning of the wall ties. By conforming with DD140, the ties will meet these requirements.
BS EN 845-1: 2003 Specification For Ancillary Components For Masonry - Part 1: Ties, Hangers And Brackets
Where wall ties are connecting to beams, columns or other parts of a building, the European Specification denotes the requirements of material, tolerance and tie type. The standard BS EN 845-1 also applies for interconnecting masonry.
Positioning & Density Of Wall Ties
Wall ties should be placed evenly over the area of the wall except for openings, where ties should be staggered. At vertical edges of an opening, unreturned or unbonded edges, and also at vertical expansion joints, additional ties should be placed at a rate of one per 300mm in height and located not more than 225mm from the edge.
Spacing Of Ties
Wall ties should be built into each leaf with a minimum embedment of 50mm. However, ACS recommend an embedment of 62.5mm to allow for site tolerances. Drip features on a wall tie should be placed at the centre of an open cavity.
The bending of installed wall ties should be forbidden at all times as this affects the performance of the tie and weakens the embedment in the inner leaf.
Recommended Lengths for Masonry To Masonry Wall Ties
Recommended Lengths for Masonry To Concrete or Steelwork Wall Ties