INTERIORS


87


ring to tile and stone coverings – or worse, cause a loss of bond between the covering and the substrate which can result in overall damage to the surface covering. For this reason, industry standards state that all tile and stone installations should include the use of movement joints. In many circumstances, movement joints


are overlooked or left to the contractor; however, a lack of movement joints can be a contributing factor to many different types of failure. Furthermore, if movement joints are not included in the specification, liability for any resulting problems (even if the problem doesn’t directly relate to a lack of movement joints) could fall to the architect, as it’s their responsibility to specify the type of joint and location of them.


The Importance of Movement Joints F


luctuations in temperature and moisture cause movement in the subfloor and result in cracks transfer-


The question, however, is how do you


provide the movement joints necessary to ensure a durable installation and what movement joints should you use? Movement joints have to go through screed


to the covering, with consideration to intermediate surface joints and therefore need to be designed into the specification. Understanding the types of movement that can occur – namely drying shrinkage, differential movement, deflection movement, structural movement, moisture movement and thermal movement – will help when deciding which type of movement joint will best counteract the resulting stresses. In floors, there are two basic types


of movement joints: structural and non-structural. Both types will be subject to different movement patterns – for example, whether movement will occur from the covering through to the floor slab or just in


the covering assembly, and this will affect the type of joint needed to prevent damage. Pre-formed joints can accommodate


roughly 15-20 per cent of their movement zone. Schlüter®


-DILEX movement joints offer


complete protection and are available to specifiers in a wide selection of materials, colours, and movement capability. Find out more by hosting the CPD


seminar ‘Movement Joints and Uncoupling Membranes for Tile and Stone Coverings’ at your architectural practice, call Schlüter-Systems today. For priority booking quote ADFMJU09. Schlüter-Systems Ltd has NBS Clauses and


BIM Objects available on NBS Plus, National BIM Library and on the website.


01530 813396 www.schluter.co.uk


ADF SEPTEMBER 2017


WWW.ARCHITECTSDATAFILE.CO.UK


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