Longer wall ties will be required where cavities are outside the tolerance offered. Remedial Wall Ties. Our Type 7 (Ancon reference TFMT7) is designed for use in larger buildings, offering a movement allowance of up to 65mm. The maximum horizontal spacing is 900mm and the maximum vertical spacing is 450mm. Leviat, the new home of Ancon, HALFEN, Isedio and many more trusted product brands, will be exhibiting at the Tall Buildings Conference & Awards first online event, taking place on Wednesday 18th November 2020. Includes 75 brick ties… That’s why cavity wall insulation boards usually have a maximum dimension on the short edge of 450mm. THOR WALL TIES are stainless steel helical anchors used to replace damaged, missing or corroded wall ties. Correct wall tie installation with equal embedment in each leaf. Where 1,200mm boards are used with partial fill cavities, the wall ties should: be spaced closer to provide adequate support and restraint be spaced at 600mm centres in rows, i.e. Short-end (SE) Snap Ties measure 4-3/4” at each end, plus the wall thickness. Inaccurate spacing. The two leaves should be coursed so that the wall tie is level or slopes outwards. The most frequently occurring problems related to the incorrect use or specification of wall ties are as follows: If left without remedial action, these faults can potentially result in serious structural problems, and in some cases the result can be total failure of the wall. The maximum horizontal spacing is 900mm and the maximum vertical spacing is 450mm, although this may be varied if required by the Building Regulations. Generally there are 3.6 units per m2 which is the same as stainless steel or galvanised wall ties. Timber frame ties should be installed at a minimum density of 4.4 ties per square metre in buildings where the basic wind speed does not exceed 25m/s (BS 6399-2:1997 Code of Practice for Wind Loads). Tie failure. European CE Mark Approval to EN845-1:2013. If the tie rusts, the swelling effect may cause horizontal, external cracks to appear in the wall. Please enable Javascript or upgrade your browser to access all the features. For typical layout of wall ties indicating maximum spacing, see the image below or click the link. What is a Head Restraint and why are Head Restraints required in masonry panels? Mon-Fri, 08:30-17:30, Get regular updates on new product developments, technical advice and industry news. Most codes specify one tie per 2.67 square feet of wall area, which can be met by nailing ties to each stud and spacing them every 16 inches up the wall. Insufficient quantity of ties being installed, particularly at wall heads and around openings. Why are brick support angles manufactured from stainless steel? It arises when the galvanizing is not of sufficient quality and the outer leaf of the cavity wall allows water penetration, usually due to porous brick/blockwork. Wall ties should be of the correct length to ensure they are properly embedded in the masonry. in taller buildings). The density should be increased to 7 ties per square metre in more severe situations. Then, the recess is filled about 2/3 deep with a repair mortar (such as Simpson Strong-Tie® FX-263 Rapid Hardening Vertical/Overhead Repair Mortar ). Historically, the size, spacing and type of ties have been entirely empirical. Wall ties and their fixings should be: spaced at jambs of openings and at movement joints at a maximum of 300mm vertically and within 225mm of the masonry reveal or movement joint; additional studs may be needed. The Ancon Staifix-Thor Helical TJ2 wall tie requires 85mm embedment in the inner leaf of blockwork and 70mm in the outer leaf of brickwork. An additional vertical row of wall ties should be inserted at open reveals (gable apexes, windows, door openings, etc.) Symmetrical Ancon wall ties (HRT4, RT2, ST1 and Teplo-BF) accommodate some site tolerance in their length, for both cavity width variation and centring of the tie. There should be a minimum 15mm cover from any exposed surface. The maximum spacing is 36 inches horizontally and 24 inches vertically. Available in … Please leave a comment using the form below. In line with PD6697:2010 and Approved Document A, the minimum wall tie embedment is 50mm. This site requires a JavaScript enabled browser. As a general rule, ACS recommend opting for either a type 2 or type 4 wall tie due to their increased compatibility and availability. Subscribe, © Copyright 2020. Subscribe, © Copyright 2020. not staggered. Over time, ties of various sizes, configurations and Historically, the size, spacing and type of ties have been entirely empirical. You need two and a half wall ties per square metre of masonry. Steel Sheet Ties 316 Stainless Steel (R4) 0-1km severe marine: 316 Stainless Steel (R4) 316 Stainless Steel (R4) These wall ties can be used in commercial or domestic buildings up to 15m in height providing the wind speed is limited to 25m/sec. Here the vertical spacing is reduced to a maximum of 300mm and ties should not be more than 225mm from the edge of the opening. This one-piece cavity wall tie means there are no plugs, you simply require a drill & 8mm drill bit. Insufficient embedment in mortar joint adversely affecting wall tie performance. This can result in the ties being over-loaded leading to potential failure. Tech Notes 44B - Wall Ties for Brick Masonry [Revised May 2003] Abstract: The use of metal ties in brick masonry dates back to loadbearing masonry walls in the 1850's. Helical wall ties in a 30 square metre kit, based on spacing’s of 2.5 ties per square metre. Wall ties should be of the correct length to ensure they are properly embedded in the masonry. Failure of ties is an increasing problem with cavity wall ties made from galvanized steel. This often means there is a wall tie every course of blocks within 225mm of the opening. We recommend tie lengths which achieve an embedment of between 62.5mm and 75mm. The minimum design embedment in each leaf is 62.5mm. Long-end (LE) Snap Ties measure 8-1/4” at each end, plus the wall thickness. Note that truss-type joint reinforcement is stiffer in the plane of a wall compared to ladder-type, so it is more restrictive of differential movement. Typical layout of wall ties indicating maximum spacing (GIF, 215 KB) Wall Tie Replacement – Selection & Spacing of Wall Ties. For walls in which both leaves are 90mm or thicker, ties should be used at not less than 2.5 per square metre (900mm horizontal x 450mm vertical centres). This can result in the overall lateral capacity of the wall being reduced. This site requires a JavaScript enabled browser. No British Standard has yet been defined for the spacing of remedial wall ties. The ties should be evenly distributed over the wall area, in a staggered pattern, except around openings. Ancon’s 25/14 restraint system is designed for use with cold-formed steel frames. Typically ties are evaluated for Type A status on the basis of installation at a standard density of 2.5 ties per square metre (that equates to spacing at 900mm horizontal x 450mm vertical centres). Stitching ties are placed in the plane of the wall within the horizontal bed joint. Please refer to Ancon’s technical literature for further details. Without them, the two leaves of the wall cannot act in unison to resist loading and therefore the wall would be weaker than the designer intended. Request literature, Office Opening Hours Send us an enquiry This is a channel and tie system where the channels are placed vertically at stud positions. PD 6697, however, does provide, in Table 10, a suitable classification system based on that previously contained in BS 5628. For cavities wider than 175mm calculate the length as the nominal cavity width plus 125mm and select the nearest stock length. This article answers common questions related to the use of wall ties. The Edinburgh schools report: A wall tie manufacturer’s perspective. The wall ties are made of 304 and 316 Grade Austenitic Stainless Steel. Please refer to Ancon’s technical literature for further details. Wall ties are essential elements in the stability of all masonry panels and are available in a wide range of length and types. The selection of wall ties is based on the distance of the structure from the coast and whether that coast opens to a sheltered bay or clear ocean. Slot Spacing for Filler End Rails Fillers Steel‑Ply Fillers are manufactured from the same steel and plywood as panels, ... of the face of the “U” for wall ties. Standard spacing for cavity brickwork 900mm x 450mm centres in a staggered pattern (2.5 ties per square metre) Typical Layout of Wall Ties Indicating Maximum Spacing Length of Tie & Embedment Wall ties should be of the correct length to ensure they are properly embedded in the masonry. This supports most codes which require one wall tie for every 2.67 SF of wall area. Ties should be spaced every 16" vertically and every 16" or 24" horizontally depending on stud spacing. As timber frames tend to shrink and expand seasonally, the wall tie should be flexible enough to cope with this differential movement. Tie types 5 and 6 (Ancon references STF6 and TIM6) allow for 24mm of frame shrinkage and are suitable for most timber frame buildings up to four storeys high. The drip should face downwards. Whilst the requirements for wall ties are covered in BS EN 1996-1-1there is no classification system for ties indicating their suitability for different end uses. inclined away from the sheathing so that the slope is maintained following differential movement. Complete our online contact form for general enquiries or make a literature request. Change the wall tie pattern around openings such as windows, doors, roof verges, unreturned or unbonded edges and un-tied vertical movement joints. An important factor in the design of timber frame ties is the allowance for vertical movement. Leading masonry support brand, Ancon, and the UK’s largest brickwork special shape and masonry fabrication company, Ibstock Kevington, have launched Nexus® XI – a new, mechanically fixed brick-faced support system and lintel range - to further enhance the already popular Nexus® offering.

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