Calculating the amount of mortar
This calculation depends on the measurements of the chosen brick. Estimate the necessary number of litres/m² of mortar by means of this table.
Calculate the surface (see calculating the number of bricks) and multiply this by the number of litres/m² to get the volume of mortar.
- For a bastard mortar with approx. 1 m³ of sand and a proportion 1 : 1 : 6 you will need the following:
- Portland cement (CEM I and class 42,5): approx. 200 kg
- Chaffed lime: approx. 100 kg
- Rhine sand 0/2: approx. 1600 kg of 1m³
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For lime mortar with approx. 1 m³ of sand and a proportion 2 : 1 : 1 you will need the following:
- sandy clay: approx. 3200 kg
- Rhine sand 0/2: approx. 1600 kg of 1 m³
- chaffed lime: approx. 600 kg
Example (by means of building plan):
- number of litres mortar/m² ½ brick wall for Module 50 = 32 litres or 50 kg
- number of litres mortar/ m² 1 brick wall for Module 50= 64 litres or 100 kg
- total surface ½ brick thick = 2,576 m²
- total surface 1 brick thick= 5,422 m²
- total surface vault ( 1 brick thick) = 2,24 m²
- necessary volume of (bastard) mortar = (2,576 x 32) + (5,422 x 64) = approx. 430 litres
- necessary (bastard) mortar in kg = (2,576 x 50) + (5,422 x 100) = approx. 670 kg
- necessary (loam)mortar in kg = 2,24 x 100 = approx. 224 kg
Tips:
- Always take into account a decrease in volume of 25-35%
- 25 kg of mortar cement gives approximately 12,5 l of mortar.
- 25 kg of cement gives approximately 20 l of concrete
- 25 kg of chaffed lime gives approximately 45 l of lime putty
- specific weight cement: 1250 kg/m³
- specific weight dry sand: 1600 kg/m³
- specific weight chaffed lime: 600 kg/m³
- specific weight gravel: 1300-1560 kg/m³