Portland Stone Landscaping

Portland Stone'€™s strength, versatility and natural beauty has encouraged  its use in a wide variety of landscape applications.

Armed Forces Memorial

The use of Portland Stone in landscaping (excluding cladding) has been sub-divided into three sections:

Walling (Load Bearing Walling Masonry)

Paving

Sculpture (Ornate)

Selecting the Stone

The Stone Federation has produced a document explaining the processes that should be considered when selecting a stone, 'Selecting the Correct Stone'. 

If you'd like to request a copy please email enquiries@stonefed.org.uk or contact us directly at enquiries@albionstone.com.


Samples

The initial selection of the stone is normally made after viewing an Indicative Sample.

These are small samples that show the typical colour and texture, but cannot show the natural variations that are present in all stones.  The stone selection should always be confirmed with an inspection of buildings (case studies) built using the same stone and a visit to the quarry and mine to view the natural faces and Quarry Range Panels.


Inspection of Past Projects

Albion Stone can provide a list of case studies showing projects using the same stone and application. 

Please note that some of the projects may be private houses where access can be a problem, but we can normally direct you to some public buildings. When visiting the site, it is important to view the stonework as an entirety as well as looking at the individual geological features that give the stones their unique character.


Inspection of the Mine

Most project teams will arrange at least one visit to the Mine at Portland, Dorset. 

The visit provides an opportunity to examine the Mine faces and the stock and to familiarise yourself with the geological variations from bed to bed. Albion Stone has produced large Range Panels that show the natural geological variation of each stone. It is important to provide information on the quantity of stone required and the programme for the project so that the availability of particular stones can be established. The potential and merits of a block pre-purchase can also be examined. Albion Stone produces a quarterly ‘Mine Report', which provides information on the availability, geology and sizes of the blocks in stock. Although long stones are available, it is advisable to check that the sizes of the typical stones on the project are readily available from the chosen blocks.


Technical Data Sheets

The stones' physical properties need to be considered as part of the selection procedure.

Albion Stone has Technical Data Sheets for the various beds in the quarries and mine.  The figures on these sheets have been prepared using the methods set out in the harmonised European Testing Standards into the highest expected values (HEV), the lowest expected value (LEV) and the average. Due to the large number of tests, these figures provide the design team with a high level of confidence.

CE Certificates and Declarations of Performance

The figures from the Technical Data Sheets have been used to CE mark Albion Stone's products. 

The CE marking of all natural stone became a legal requirement in July 2013, but Albion Stone have been CE marking all their stones since 2008. CE marking provides a legal confirmation to the client that the product is suitable to be placed on the market.

The European Standard BS EN 1469 requires that all stones comply with a regime of Initial and Factory Control Testing. Although results from a number of different tests will help build a picture of the physical properties of the stone, it is normally only certain tests that determine the suitability of a particular stone in a particular application.

Please email us on enquiries@albionstone.com if you wish t request any of our CE Certifcates and Declarations of Performance. 

Inspection of the Range Panels

To assist the selection of the most appropriate bed, Albion Stone has produced large Range Panels. 

These panels show the natural geological variation in the different beds of stone and shall not become a reason for rejection unless their concentration becomes excessive and the typical character of the stone is lost. As stated in BSEN 1469 'The reference sample does not imply strict uniformity between the sample itself and the actual supply; natural variations may always occur'.

Quality

Albion's Portland Stone bears the BSI ISO 9001 certification kitemark. 

This is your assurance that samples are regularly subjected to rigorous, independent testing to ensure that they comply with stringent standards for safety, product performance, and reliability. In addition, this also means that the quality systems of the factory where this Portland Stone is manufactured are systematically assessed.

The certification is therefore Albion Stone's commitment towards maintaining the highest possible standards.

Certificate of Registration is available upon request. 

British/European Standards

We recommend that the following standards are read in conjunction with this Technical Manual:

  • BS EN 771- 6:2011 Specification for masonry units. Natural stone masonry units
  • BS EN 1341: 2012 Slabs of natural stone for external paving-Requirements and test methods.
  • BS EN 1342: 2012 Setts of natural stone for external paving-Requirements and test methods.
  • BS EN 1343: 2012 Kerbs of natural stone for external paving-Requirements and test methods.  
  • BS 7533-12: 2006 Pavements constructed with clay, natural stone or concrete pavers.

Specification Clause

Q25 - Natural Stone Slab/Brick/Sett/Cobble Paving