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STRUCTURAL ELEMENTS Watertight concepts


Christopher Burbridge from Delta Membranes looks at the importance of concrete in below ground waterproofing, and the key factors for achieving a robust specification


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he restrictions Covid-19 will inflict on the construction industry, and how the pandemic might influence how we work in the future, is very much an unknown. Of huge reassurance is that the industry is well versed in dealing with difficult times, and adapting to change. We often think of the word “change” as being a negative, however, it can help us to develop a more resilient approach and assist with our capacity for growth and learning. One material which has definitely seen a lot of coverage during the pandemic has been concrete. With many plants closing during lockdown, concrete supplies were choked off, with limited options and increased lead times. Construction projects rely heavily on quarry products, and this will have impacted on projects in various ways ranging from delays to sourcing new supplies.


T


The strong industry demand for concrete, due to its many important attributes such as in structural waterproofing, will continue in importance, as specifiers look to ensure life-cycle oriented design


and reliable, durable and robust waterproofing solutions.


Structural waterproofing In terms of types of structural waterproofing, concrete is classed as a Type B, integral protection system. British Standard BS 8102:2009, which all waterproofing systems should adhere to, defines three types of systems.


Type A (Barrier) Protection Also historically referred to as ‘Tanking,’ this provides protection against groundwater ingress by applying a waterproof material to the internal or external walls and floor slab of a basement or underground structure, forming a barrier between the structure and any groundwater. Historically, methods for Type A systems included internal, external and sandwich.


Type B (Structurally Integral) Protection


This is protection against water ingress provided by the structure itself. Type B


ADF NOVEMBER 2020


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