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Portland Stone - Decorative Stonework / Ornate Carving - Natural Limestone Carving

Verified by manufacturer 5 months ago

Bowers Roach

Albion Stone plc Variant:
Third party certifications:
  • ISO 45001 Health and Safety Management

    Certificate type

  • ISO 9001 Quality Management

    Certificate type

Portland stone for decorative stonework/ ornate carving.

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Application

Suitable for decorative stonework/ ornate carving and masonry units greater than 80 mm thick.

Description

The 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. All beds of Portland Stone are suitable for carving, however, tighter stones such as the Basebed are particularly suitable for intricate carving.


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:

  • Creamy/ white in colour.
  • Masonry units (>80 mm) manufactured in natural stone.
  • Intricate designs.
  • Uses the UK's most environmentally friendly techniques.
  • From the Jordans/ Bowers mine and Stonehills mine on the Isle of Portland.
  • Regularly assessed and accredited by the completely independent British Standards Institute.
  • CE marked.

General information

Color

Cream

White

Grey

Manufacturer guidance

Creamy/ white is typical Portland colour with grey shell included.

Finish

Honed

Material

Limestone

Shape

Circle

Oval

Triangle

Square

Rectangle

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Length

Bespoke

Width

Bespoke

Height

Bespoke

Uniclass

Pr_20_93_52_56 Natural dimensioned stonesPrimary

CAWS

F21/110 Ashlar

F21/110 Ashlar

Specification data - Natural dimensioned stones

Standard

To BS EN 771-6.

Denomination

-

Name (traditional)

Portland stone.

Petrological family

Limestone.

Guidance for specification option:

Open textured oolitic limestone formed from ooliths in a micrite matrix.

Colour

Creamy white.

Manufacturer guidance

Creamy/ 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.

Unit dimension tolerances

Category D2.

Compressive strength

-

Mean value (minimum)

To BS EN 1926, 54.99 MPa.

Open porosity

To BS EN 1936, 17.58%.

Guidance for specification option:

Lowest expected value 9.88%, highest expected value 28.39%.

Manufacturer guidance

Average value.

Additional requirements

-

Apparent density

To BS EN 1936, 2191 kg/m³.

Guidance for specification option:

Lowest expected value 2123 kg/m³, highest expected value 2331 kg/m³.

Manufacturer guidance

Average value.

Mean flexural strength

To BS EN 13161, 4.07 MPa.

Saturation coefficient

To BS EN 12370, 2.88%.

Guidance for specification option:

Lowest expected value 0.67, highest expected value 0.85.

Manufacturer guidance

Average value.

Light reflectance

57.00 (mean value).

Guidance for specification option:

Value from Grove Whitbed test, however these stones are very similar.

Manufacturer guidance

Light reflectance tested using NCL Colour Scan instrument - Grit 60.

Breaking load

To BS EN 13364, 4032 N.

Guidance for specification option:

Lowest expected value 3492 N, highest expected value 5949 N.

Manufacturer guidance

Breaking load at dowel hole (at 75 mm thick). Average value.

Water absorption (maximum)

To BS EN 13755, 6.02%.

Guidance for specification option:

Lowest expected value 3.40%, highest expected value 8.40%.

Manufacturer guidance

Average value.

Sustainability data

Contains Red List materials

No

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

Material

Limestone

Embodied carbon

A1-A3 (production stage) as defined in BS EN 15804

0.04 kg CO₂ eq/kg

Self declared

Recyclability

100

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

0 %

Third party certifications

ISO 45001 Health and Safety Management

ISO 45001 Health and Safety Management

ISO 45001

ISO 9001 Quality Management

ISO 9001 Quality Management

ISO 9001

Literature

TDS - Jordans Whitbed

TDS - Jordans Whitbed

TDS - Jordans Roach

TDS - Jordans Roach

TDS - Jordans Basebed

TDS - Jordans Basebed

TDS - Grove Whitbed

TDS - Grove Whitbed

TDS - Fancy Beach Whitbed

TDS - Fancy Beach Whitbed

TDS - Bowers Whitbed

TDS - Bowers Whitbed

TDS - Bowers Roach

TDS - Bowers Roach

TDS - Bowers Basebed

TDS - Bowers Basebed

CE - Masonry Units - Jordans Whitbed

CE - Masonry Units - Jordans Whitbed

CE - Masonry Units - Jordans Roach

CE - Masonry Units - Jordans Roach

CE - Masonry Units - Jordans Basebed

CE - Masonry Units - Jordans Basebed

CE - Masonry Units - Grove Whitbed

CE - Masonry Units - Grove Whitbed

CE - Masonry Units - Fancy Beach Whitbed

CE - Masonry Units - Fancy Beach Whitbed

CE - Masonry Units - Bowers Roach

CE - Masonry Units - Bowers Roach

CE - Masonry Units - Bowers Basebed

CE - Masonry Units - Bowers Basebed

Heritage Portland Stone Datasheet

Heritage Portland Stone Datasheet

Case studies

Green Park Tube Station

Green Park Tube Station

Pagan Pillars and Roundels

Pagan Pillars and Roundels