Engineered Levelling Shims | Brilliant Ideas Brilliant Ideas | Engineered Levelling Shims

Our engineered levelling shims are called Stacker Packers and because of their compressive strength, they’re trusted by industry. They’ve been used on all sorts of high-profile projects, including Barcelona Cathedral, Fulham Football Club, Sandwell Aquatics, Anfield Main Stand, Wimbledon Court One, Manchester Metro and Emirates Stadium.

In the last 12-months alone, orders for Stacker Packers has increased 225% – they’re shipped across the UK and abroad. In fact, we’ve just despatched some more to our client in Barcelona.

Made from virgin High Impact Polystyrene (HIPS) they’re perfect for use on steel framed buildings which support precast concrete components. Stacker Packers have interlocking dowels which makes sure they remain safe and stable during installation – so, there’s no slipping against each other under load.

Why choose Stacker Packers

Our Stackers have been independently load tested by the HCC County Highways Laboratory – and passed with flying colours.

Very recently, we carried out extensive tests where we applied loads of up to 23T onto our 70mm x 70mm plan area of Stacker Packers. On shim stacks ranging from 25mm to 100mm we recommend a compressive strength of 30N/mm² is assumed for design purposes. Based on an applied load of 14.65T onto a 50mm shim stack, vertical deformation was only 0.38% or 0.19mm.

  • Manufactured from virgin high impact polystyrene (HIPS) with UV Sun Inhibitor – which stops the material becoming brittle over time.
  • Fully 3D tied interlocking system made from virgin material – which won’t shatter under load or drilling
  • Final location adjustments can easily be made – keeping hands away from the trapping zone.
  • Shims are modular – available in 2mm, 3mm, 5mm and 10mm

Traditional plastic shims on the other hand are not load rated, as they’re made from recycled plastic.

Here’s what the Market Leader in Structural Steel​ said about Stackers:

‘We love how Stacker Packers interlock together, where four or six shims become one, to create a safe and stable shim stack. We know that the shims have been independently load tested and manufactured from certified material, so we they are ideal for precast concrete stadia components. The interlocking side profile also enables adjustment which keeps the operative hand away from the trapping zone, you can also interlock adjacent shims to create a larger bearing area. We’ve already used thousands of them on our Fulham Football Club development and we will be using them on our forthcoming projects. Stacker Packers is a great product.’

Steve Burley, Senior Site Manager, Severfield (UK) Ltd

To download our datasheet please click here or contact us to find out more.