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 >> Quantity Calculation Guide  
     
 

Metric Quantity Calculation Guide

PLEASE NOTE This information is intended as a guideline and H C Wraxall and Co Ltd bear no responsibility for its accuracy. A quantity surveyor should be consulted where accuracy is important. Materials are natural and will be subject to variation.

If you would like to know what area will be covered by a certain tonnage of cobbles please click here.

Quantity Calculation Guide - Flat Roofing Shingle

Our quantity calculation guide requires the area dimensions expressed in square metres and calculates the tonnage of flat roofing shingle required for that area with a depth of 50mm.
 

Roofing Dimensions - area in square metres 

sq m

 

Tonnage required for 50mm depth is 

tonnes

 

 

Imperial Quantity Calculation Guide

Quantity Calculation Guide - Flat Roofing Shingle

Our quantity calculation guide requires the area dimensions expressed in square yards and calculates the tonnage of flat roofing shingle required for that area with a depth of approximately 2 inches.
 

Roofing Dimensions - area in square yards 

square yards

 

Tonnage required for 50mm depth is 

tonnes

 

 

Quantity Calculation Guide - All Size Cobbles

Our quantity calculation guide requires the area dimensions expressed in square metres and the tonnage required is dependent upon the specification for the way that the cobbles are to be laid:-

  1. Laid Flat
  2. Laid on Edge
  3. Laid on End

1. Laid Flat Cobbles

 

   

LAID FLAT Area in square metres

sq m

 

Tonnage required for LAID FLAT cobbles is 

tonnes

 

2. Laid on Edge Cobbles

  

 

 

LAID ON EDGE Area in square metres

sq m

 

Tonnage required for LAID ON EDGE cobbles is 

tonnes

 

3. Laid on End Cobbles

 

 

 

LAID ON END Area in square metres

sq m

 

Tonnage required for LAID ON END cobbles is 

tonnes

 

All Size Cobbles

Approximate number of cobbles to tonne:

Metric Sizes

Imperial Sizes

Approx. no. of cobbles per Tonne

38-50mm

1.5-2 “

6750

50-75mm

2-3”

2875

75-100mm

3-4”

1800

1.6 tonnes = 1 cubic metre

Knapped cobbles for walling

1.00 tonnes = 10 square metres

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