Levelling shims are manufactured in plastic and can be used with rubber support pads for paving slabs and plastic fixed height support pads.

They are used to alter the level by very small amounts in order to get correct paving, where the thickness of the actual paving slab alters slightly from one flag to another; where the deck underneath changes; or where an unexpected door threshold occurs, for example. These minor changes can be addressed with the use of levelling shims.

Levelling shims have been designed to fit on top of all fixed height support pads and will make up those small differences in the level. To avoid one of the slabs rocking, applicators can simply hang a levelling shim onto the support pad to make up the difference.

Shims are available 1mm, 2mm and 3mm thick. They are loose fitted and held in place by the positioning lugs. The 3mm thick shim has a slightly different shape to the 1mm and 2mm shims, but all three are suitable for all of the fixed height supports. The shims will overhang the rubber ring slightly, but this is no issue. The weight of the slab will ensure that the whole system is held in place properly.

All shims can be snapped apart into quarters of half shape, where only one corner needs extra support. This is often required where just one of the flags becomes unsteady and needs bringing up to the level of the others.

Multiple shims can be stacked onto a support pad, but care should be taken that the lug does not become engulfed as this will affect the paving guide and compromise straightness. There needs to be enough of the lug showing for the slab to butt up to.

RUBBER ACOUSTIC / ANTI-SHOCK SHIMS

These shims are styled in the same design as the standard plastic 3mm shim, but are made from PVC instead of plastic. They are 2.5mm thick and can be placed onto both fixed height support pads, ASP adjustable supports and TD timber decking supports.

They act as an effective vibration or sound control layer. They can deaden the sound of pedestrian traffic over tiles or timber decking (very useful when terraces are being installed on top of dwellings below) and give extra protection by preventing the risk of vibration damaging the tiles over time.

They can be used with rubber support pads for paving slabs, on plastic fixed height support pads, on adjustable height support pads for paving slabs and on EXTENDED HEIGHT ASP supports.

RUBBER ADJUSTABLE HEIGHT SHIMS

Wallbarn also offers wedge shaped discs. They slope from a thickness of 8mm at the highest down to 3mm. they can be used as a slope corrector beneath fixed height support pads. Simply placed onto the deck with a plastic or rubber ring loose laid on top without fixings, they can take out the fall in the deck to ensure that the support pad is completely vertical and straight, and the paving does not tilt in any way.

On areas where there is only a very small threshold, it is possible to use two of these wedge shaped discs together to act as an alternative adjustable pad. More a shock absorber or membrane protection than an actual support, they can be slid towards or away from each other to create different thicknesses, achieving a range from 3mm (where one has been used on its own, up to 11mm, where two have been stacked on top of each other completely.