Specifications – 100mm Cob Block
Cob Block Dimensions
Cob Block Length – 385mm
Cob Block Depth – 215mm
Cob Block Height – 100mm
Cob Block Weights
Cob Block Manufacturing weight – 18.5kg
Cob Block Dry weight – 16kg
Cob Block (in-situ) Compression Strengths
Cob Block laid flat – 10t+ of spread load
Cob Block laid on edge – 1.8t of spread load
Coverage (per square metre – single skin wall)
Cob Blocks (laid flat) – 24 p/s/m (mortar required – 60kg)
Cob Blocks (laid on edge) – 12 p/s/m (mortar required – 25kg)
Cob Blocks – Packaging
Cob blocks per pallet – 52
Total (full pallet) weight – 700kg
Cob blocks are also sold individually
Cob Block point-of-use
Medium to large cob wall repairs
Cob wall rebuilds
New cob walling
Recommended binding mortars
Natural Hydraulic Lime (NHL2) + coarse sand (2.5 parts sand to 1 part NHL2 by volume)
Non-hydraulic lime (lime putty) + coarse sand (2.5 parts sand to 1 part lime by volume)
Sieved, clayey soil + water (consistency should be more wet than dry)
Preparation
Ensure that the accepting surfacing is moistened prior to a mortar bed being introduced. This can be achieved with either a low-pressure water sprayer or a soft bristled hand brush dipped in water and applied to the surfacing. NB These operations are not essential, however they will ‘buy the user some time’ to ensure the cob block is levelled accurately before the mortar starts to cure.
Specialist Skills
There are no specialist skills required to install these cob blocks. A general builder or a competent DIY’er can achieve effective results with relative ease.
Precautions
Cob blocks can be stored inside or outside. If stored outdoors – keep the cob blocks off of the ground and cover with a weatherproof sheeting – do not allow the cob blocks to become moisture/water saturated.
Do not drop these cob blocks. Whilst our cob blocks deliver high compression strengths within any given wall they have minimal tensile strength.
Handle with care.
Cob Block Prices (exc VAT and delivery)
Cob Blocks (each) – £2.90
Cob Blocks (100+) – £2.61
Cob Blocks (pallet of 52) – £150.80
Technical Information – Compression Strength
(100mm cob block – flat)
Compression strength was tested to 10t of spread load however this failed to compromise the integrity of the block. Therefore, and until we ascertain a failure point, the overall compressive strength is +
Loading = 10,000kg (22,046lb)
Area = 131.7″
PSI = 167.4 (11.77kg/cm2)
Density = 1610kg/m3
Compression Strength = 1.15N/mm2 +
Technical Information – Compression Strength
(100mm cob block – on edge)
Max Loading (spread-load) = 1.8t
Area = 34″
PSI = 117lb (8.2kg/cm2)
Density = 1225kg/m3
Compression Strength = 0.8N/mm2
Technical Information – Thermal Conductivity
https://earthblocks.co.uk/2022/11/28/cob-blocks-thermal-qualities/
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