Please note: online orders placed after Thursday 20th December 2018 will be processed from Wednesday 2nd January 2019.

Buy Marshalls for essential peace of mind

The Turnbull Paving Team answer some technical FAQs to give you peace of mind when buying Indian sandstone. Turnbull sells high quality sandstone paving produced by Marshalls and we’re confident our customers are getting a great product. But don’t just take our word for it!

What does the Marshalls ‘Stone Standard Exceeded’ logo mean?


All stone supplied by Marshalls exceeds the base technical levels set by British Standards for stone paving products.  So, when you see ‘Stone Standard Exceeded’ logo on a Marshalls product, you know you’re getting paving, walling or driveway blocks that are technically superior and of the highest quality. You won’t find sub-standard sandstone on sale on our website!

What is the Marshalls Stone Standard?

Marshalls have their own exacting technical standards for paving strength and porosity, called the Marshalls Stone Standard.  And what’s more, all their stones and slabs are repeatedly tested by an independent UKAS accredited laboratory.  This gives customers full confidence in their stone’s technical performance.

What are the official standards for stone paving?

The base technical levels for paving slabs are outlined in the British Standard for design and installation, BS 7533-Part 12.  All Marshalls sandstone is CE marked and tested in accordance to BS EN 1341.  You can find out about the quality of individual products by going to the Marshalls website where their Declarations of Performance are available to download at

What is high-quality sandstone?

All sandstone should have relevant and valid test certificates to confirm its technical performance.  Buying a Marshalls Stone Standard marked product means you are assured your sandstone paving has a maximum Water Absorption of 1.7%, a flexural strength of no less than 12.9mpa, and has a visual inspection rating of 0 for frost impact.   Translated that means: your paving is much less likely to absorb moisture, get slippery and green with algae; it’s strong enough to withstand pressures of transportation, installation and is ideal for high traffic garden patio areas; and its frost-resistance means it will last through our harsh UK winters.  Sandstone slabs are even freeze/thaw tested in a lab to make sure they’ll take the cold!  Denser, harder sandstone from Marshalls takes longer to cut and process, which means you’ll pay slightly more than for softer sandstone with higher water content.

Why is 22mm an essential thickness for sandstone paving?

From £232.12 Per Pack
From £23.93 Per m2
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Calibrated paving slabs are now a popular option for homeowners.  Calibration means stones have been put through a strip mill to give them a consistent depth or thickness.  This makes laying quicker and easier as your installer doesn’t have to make constant alterations for each slab he lays.  It also means you know you have slabs of a suitable thickness for your project. Good quality Indian sandstone is machine calibrated between 20mm and 25mm; Marshalls Indian Sandstone is calibrated at 22mm for essential strength in all garden installations. Cheaper, sub-standard paving will be thinner and is much more likely to crack or fail.  So, be careful before choosing the lightest slabs you can find.  They might be cheaper and easier to lift, but in the long run will prove poor value for money. 

Do I need to seal Indian sandstone?

Marshalls sandstone paving slabs have such low water absorption they do not need to be sealed and need less cleaning than sandstone with high absorption rates.  Just a sweep with a good yard brush, some soapy water or light touch clean with a pressure washer is all that’s needed.

How do I know the Indian sandstone I am is buying is fit for purpose?

You need to have a YES to these essential questions!

  1. Is the stone CE marked and can the values be proven with a test report which is less than 2 years old?
  2. Is the water absorbency of your sandstone less than 2.5%? (If not, the stone will go green quickly and will be harder to maintain)
  3. Is the flexural strength of the sandstone more than 12mpa? (If not it has a greater chance of arriving damaged, cracked or breaking during installation, or once in place)
  4. Has the sandstone gone through frost resistance testing? (If not it could degrade quickly and is likely to fail once installed)