RASCOtec expansion joint units are chiefly incorporated at locations where the structural geometry or subsoil conditions necessitate the accommodation of movement. The expansion joint units may be used for a maximum joint width of 20 mm and a maximum horizontal joint movement equivalent to 10-15% of the original joint width. The joint design should be such as to minimize any vertical joint movement (e.g. through the incorporation of dowel bars).

Given the inherent difficulties in specifying or estimating the effective movement to which expansion joints are subject, every effort is made – in collaboration with the relevant design team members – to accommodate the likely movement by means of RASCOtec crack-inducing units as an alternative or in addition to the incorporation of RASCOtec expansion joint units.

A 30 mm wide, 100 mm high RASCOtec expansion joint unit comprises the following components:

• RASCOtec injection channels at top and bottom that also allow fixing
• Special foam insert for flexible waterproofing

RASCOtec expansion joint units are incorporated in:

• Ground slabs
• Walls
• Suspended slabs

As the constituent material HDPE is as easy to work as wood, the expansion joint unit – like the RASCOtec injection channel and the RASCOtec crack-inducing unit – may be effortlessly adapted to fit any conceivable element geometry.

Again, as with the RASCOtec injection channel or RASCOtec crack-inducing unit, the waterproof barrier is provided through the injection of low-viscosity RASCOflex acrylic grout. All materials used are weatherproof and amenable to installation in any outdoor conditions – a benefit that can sometimes pay large dividends in terms of construction time and cost.