Verified by manufacturer 6 months ago
Bowers Basebed
ISO 45001 Health and Safety Management
Certificate type
ISO 9001 Quality Management
Certificate type
Portland stone for external facades and cladding.
Suitable for external wall and ceiling cladding applications.
Portland Stone is extracted from one of the largest mines on Portland and although there is no colour variation in the basic matrix of the stone, the shell content and texture of each bed will reflect the light differently, creating the eight variations of the stone.
Bowers Roach:
Contains large grey shell fragments that include Turreted Gastropods (Portland screws), as well as large clam shells. It has a large number of holes scattered throughout due to the removal of fossil shells by percolating rain.
Bowers Basebed:
Clean basebed that may contain small grey shell fragments that are randomly distributed across the stone.
Grove Whitbed:
Predominantly grey shells with some large white shell fragments, mainly large thin clams up to 100 mm long laid parallel to the bedding. Some banding is evident in larger slabs.
Fancy Beach Whitbed:
A moderately high shell content, which are predominantly grey. There are small voids throughout the slab and the texture varies.
Heritage Portland Stone:
The shells are randomly distributed across the stone, with some areas of low shell content and some areas of high shell content. Varied texture is evident across the slab.
Jordans Whitbed:
A medium shell content, mainly large, thin clams up to 80 mm long laid parallel to the bedding. The stone mellows over time to grey/ white due to grey and white fragments.
Jordans Basebed:
Fine grain Portland stone containing small grey shell fragments evenly distributed across the stone.
Ostrea Patch Reef Whitbed:
The shells are randomly distributed throughout the stone, including many large grey and white oyster shell fragments. It is typically coarse with some vuggy patches.
Stonehills Whitbed:
The stone has a low to medium shell content that are predominantly grey with some white fragments that are randomly distributed across the stone. Banding is evident, particularly in larger slabs.
Features and benefits:
Color | Cream White Grey Manufacturer guidanceCreamy/ white is typical Portland colour with grey shell included. |
Finish | Honed |
Material | Limestone |
Shape | Circle Oval Square Triangle Rectangle |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Uniclass | |
CAWS | H51/110 Cladding H51/110 Cladding |
Stone slabs | |
Standards | To BS EN 1469: 2015. |
Stone type | |
Name (traditional) | Portland stone. |
Petrological family | Limestone.Guidance for specification option: Fine to medium oolitic and bioclastic limestone containing bioclasts (5 µm in width by 20 µm in length). |
Colour | Creamy white.Manufacturer guidanceCreamy/ white is typical Portland colour. The content of grey shell can vary the overall colour depending on the density of included shell. |
Origin | Bowers Quarry, Isle of Portland, UK. |
Compression strength | To BS EN 1962, 54.99 MPa. Guidance for specification option: Lowest expected value 30.0 MPa, highest expected value 90.5 MPa. Manufacturer guidanceAverage value. |
Flexural strength | To BS EN 13161, 7.95 MPa. Guidance for specification option: Lowest expected value 4.67 MPa, highest expected value 12.50 MPa. Manufacturer guidanceAverage value. |
Density | To BS EN 1936, 2226 kg/m³. Guidance for specification option: Lowest expected value 2123 kg/m³, highest expected value 2331 kg/m³. Manufacturer guidanceAverage value. |
Porosity | To BS EN 1936, 15.39%. Guidance for specification option: Lowest expected value 12.70%, highest expected value 18.40%. Manufacturer guidanceAverage value. |
Saturation coefficient | To BS EN 12370, 0.76. Guidance for specification option: Lowest expected value 0.67, highest expected value 0.85. Manufacturer guidanceAverage value. |
Light reflectance | 62.20 (mean value). Guidance for specification option: Value from Jordans Basebed test, however these stones are very similar. Manufacturer guidanceLight reflectance tested using NCL Colour Scan instrument - Grit 60. |
Breaking load | To BS EN 13364, 4601 N. Guidance for specification option: Lowest expected value 3492 N, highest expected value 5949 N. Manufacturer guidanceBreaking load at dowel hole (at 75 mm thick). Average value. |
Water absorption (maximum) | To BS EN 13755, 5.52%. Guidance for specification option: Lowest expected value 3.40%, highest expected value 8.40%. Manufacturer guidanceAverage value. |
Contains Red List materials | No |
Country of material origin | United Kingdom |
Country of product manufacture | United Kingdom |
Material | Limestone |
Embodied carbonA1-A3 (production stage) as defined in BS EN 15804 | 0.04 kg CO₂ eq/kg Self declared |
Recyclability | 100 |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0 % |
CE - External Wall - Bowers Basebed
CE - External Wall - Bowers Roach
CE - External Wall - Bowers Whitbed
CE - External Wall - Fancy Beach Whitbed
CE - External Wall - Grove Whitbed
CE - External Wall - Jordans Basebed
CE - External Wall - Jordans Roach
CE - External Wall - Jordans Whitbed
TDS - Bowers Basebed
TDS - Bowers Roach
TDS - Bowers Whitbed
TDS - Fancy Beach Whitbed
TDS - Grove Whitbed
TDS - Jordans Basebed
TDS - Jordans Roach
TDS - Jordans Whitbed
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