Costhorpe Building ProductsCosthorpe Building Products

Tech Info & Installation

Standards:-

Thorpestone Walling is manufactured to BS 6457: 1984

Cement Efflorescence:

As with all reconstructed stone and cement-based products, the temporary phenomenon known as efflorescence is likely to occur.

This causes a lightening of the colour and is in no way detrimental to the product. This effect reduces over a period of time with natural weathering.

Manufacturing Tolerances:

Dimensional tolerances permitted by BS 6457: 1984 are:-

Dimension
Tolerance

Length

Height

Bed Width
 

-5mm to 3mm

-5mm to 3mm

-4mm to 2mm
 


*NB: there is no British Standard tolerance of bed width for Pitched Faced products.

Technical data

Mean Compression Strength (typical)
26N/mm²
Mean Density
2180 Kg/m³
Water Absorption
6%
Drying Shrinkage
<0.06%
Thermal Conductivity ’K’
1.40 W/m °C - exposed
1.28 W/m °C - protected
Thermal Resistance ’R’
0.071 m² °C/W - exposed
0.078 m² °C/W- protected


Installation Guidelines:

Movement Joints - Vertical movement joints every 6 metres in long lengths of walling.

Mortar Recommendations - The recommended grades of mortar are:

MORTAR PROPORTIONS BY VOLUME
Conditions
Masonary Cement: Sand
Plasticised Cement: Sand
Cement: Lime:
Sand

Servere Exposure

Moderate Exposure

1:4.5

1:6

1:5-6

1:7-8

1:1:6

1:2:9


Resistance to Rain Penetration:

On all facing masonry in heavy driving rain, external skins of cavity walls can allow water penetration through the mortar joints. To avoid this, normal ’good building practice’ should be observed.

Packaging Details

Sizes
No. Per Pack
m² Per Pack
No. Per m²
Weight Per Pack

225 x 65 mm
(9 x 3 inches)

300 x 65 mm
(12 x 3 inches)

375 x 65 mm
(15 x 3 inches)

450 x 65 mm
(18 x 3 inches)
 

216


162


122


140

3.80


3.77


3.52


4.83

57


42


34


29

0.74


0.73


0.69


0.94



225 x 140 mm
(9 x 6 inches)

300 x 140 mm
(12 x 6 inches)

375 x 140 mm
(15 x 6 inches)

450 x 140mm
(18 x 6 inches)
 

104


78


66


68

3.67


3.63


3.81


4.69

28


21


17


14

0.71


0.71


0.74


0.91



225 x 215 mm
(9 x 9 inches)

300 x 215mm
(12 x 9 inches)

375 x 215 mm
(15 x 9 inches)

450 x 215 mm
(18 x 9 inches)

440 x 215 mm
(18 x 9 inches)
 

120


90


60


60


60

6.35


6.28


5.20


6.21


6.08

19


14


12


10


10

1.30


1.30


1.08


1.30


1.22



Split Faced Coping
600 x 150 x 65 mm

Split Faced Coping
600 x 300 x 65 mm

49




40

-




-

-




-
 

0.60




1.00


NB:

• Imperial sizes are approximate.
• Number of stones per square metre (m2) are approximate and 10mm mortar joints
   are allowed for.
• All products have a nominal bed width of 100mm as standard.

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