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Paving Bed Estimator

This form will calculate the approximate metric tonnes of sand and/or sand & bags of OPC required for the entered area.

Please enter the dimensions in the white fields below. The calculations will be completed when you leave the last input field.

Length in Metres
Width in Metres
Area in Sq Meters

Sand Only   Sand and Cement
Sand in tonnes Sand in tonnes
Cement in Kg
Cement in 25Kg bags
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Mortar Bedding

Slabs can be 'spot-bedded' with a small mound of mortar at each corner and one in the middle; whilst this is easier to adjust and correct than other types of bedding it is also weaker.
A full mortar bed provides the strongest support but can make it difficult to get the slabs true and level.
Box and Cross bedding is a good compromise; providing good support while allowing the mortar to squeeze sideways during levelling.

Basic laying steps

  • With a trowel place strips of mortar so that they form a rectangle slightly smaller than the slab dimensions, enclosing a cross strip. The cross strips can be omitted for small square slabs, but large rectangular slabs may need to be double-crossed. The strips should be 30-50mm high.
  • Position the first slab on the mortar bed and temp it level with a wooden or rubber mallet or a length of timber. It should not rock in any direction. Check for accuracy in both directions.
  • Repeat with successive slabs. Joint width will depend on the dimensions of the units, but will generally be 10-12.5mm.
  • Check alignment and level against adjoining slabs with a straight edge spanning two or more flags.

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