what are Calibrated Indian sandstone flagstone paving, Basically they are the same stone as the Non calibrated but are generally much thinner on average 22mm by having the back of the flagstone shaved off to give a consistent    thickness through out the pack . They are far easier to use and most landscapers will use nothing but calibrated stone nowadays. They came about as shipping costs increased and importers wanted and needed to get more stone in the container to keep costs down. Where as you can get 21 sq mts in a crate of calibrated you are looking at about 14-15 sq mts of non calibrated stone in a crate. Also the landscapers  like them as they do exactly the same job as the thicker slabs but are far easier to move and can be done a lot of the time with 1 person. They do work out more expensive that the Non Calibrated ones but you should be able to negotiate a far better laying cost as they can be put down much quicker saving time .

We sell a product called Easy Joint which is used for Jointing Sandstone paving or cobble stone setts. If you can use a broom then you can save time money and effort with our easy lay jointing Compound.  We even offer it a massive discounted price £22.50 +vat instead of £30.00 +vat if you purchase it at the same time as the stone from us. 1 pot will cover an area of 7sq mts on calibrated 22mm stone.

Whilst it is slightly more expensive that the old fashion method of mixing sand and cement mortars but considerable savings can be made when you take time and effort into account. It is also very good at stopping weeds and algae growth and even hold if you use a power wash regularly.

for more information follow link  http://www.herefordbrickandstone.com/jointing-compounds.html 

Calibrated Slate and sandstone paving is a way of finishing off Flagstones and Slabs of various thickness into a standard thickness (rather like a tile) in our case 20mm or 22mm. This is mainly produced with stones from India and China .
         Theses can be used and laid on a level screed bed rather than the harder to use un-calibrated stone paving. The calibration takes place on the under side of the stone and generally you will see lines running on the underside where the machinery has been used to level it off.
          Whilst Calibrated natural stone is more expensive than standard  non calibrated most landscapers quote less for laying so you should make them aware that you are going to purchase Calibrated and if you are using it yourself you will find it much easier to use.

Reasons to Use Calibrated Stone Paving
Easier to lay . No variance in thickness. Lighter to pick up and carry, Cheaper Costs for having laid. More cost effective when it comes to delivery costs  (up to 22sq mts per tonne)