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Home > Building Blocks > Blocks Technical

Calxite Standard Stock and Technical Details

blocksBlocks are manufactured to European Standard BS EN 771-3

(Superseding British Standard BS 6073-1)

Type of blockSolidSolidSolidSolidHollowHollowSolidSolid
Face size: 440mm x 215mm x75mm100mm140mm190mm140mm215mm100mm100mm
FinishClose TexturedClose TexturedClose TexturedClose TexruredClose TexturedClose TexturedGeneral PurposeGeneral Pupose
Compressive Strength to BS EN 771-3 (N/mm2)
Equivalent Strength to BS 6073-1 (N/mm2)
Shear Bond Strength from Annex C of BS EN 998-2 (N/mm2)
Average Block Weight (kg)14.619.026.036.319.726.519.526.6
Gross Dry Density (kg/m3)18501850185018501850185019501950
Approximate Unrendered Wall Weight (kg/m2)154203275388208280209280
Thermal Conductivity (W/mK @ 3% moisture content)
Moisture Movement (mm/m) (shrinkage & expansion)<0.5<0.5<0.5<0.5<0.5<0.5<0.5<0.5
Water Vapour Permeability tabulated from EN 1745 (u)5/155/155/155/155/155/155/155/15
Configuration to EN 1996-1-1Group 1Group 1Group 1Group 1Group 2Group 2Group 1Group 1

Note: unit weights, which are given for design purposes, are approximate only and based on 3% moisture content. All units are Category 11 and manufactured to tolerance category D1.

Fire Resistance

Thakeham Calxite building blocks are manufactured from class 2 aggregates and are classified as reaction to fire Class A1.

Fire Ratings
 Loadbearing No Finish (hours) Non Loadbearing No Finish (hours) 
Block ThicknessSingle LeafCavitySingle LeafCavity
75mm solid1.5 hrs1.5 hrs1 hr4 hrs
100mm solid2 hrs2 hrs2 hrs6 hrs
140mm solid2 hrs2 hrs3 hrs6 hrs
190mm solid2 hrs2 hrs4 hrs6hrs
140mm cellular3 hrs--3 hrs--
215mm hollow----6 hrs--


Pack Details

Packs are delivered banded with or without pallets. Additional packing can be supplied on request. Pack sizes and weights are as follows:

Block ThicknessPack Sizes (metres)Pack Weight (tonnes)
75mm solid7.21.0
100mm solid7.21.4
140mm solid4.81.2
190mm solid3.21.2
140mm cellular4.81.0
215mm hollow3.21.0



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