Dont Lay Natural Stone Paving On A Concrete Base

In theory, laying natural stone paving on top of a concrete base seems like a good solution. A concrete base offers a strong platform on which to lay natural stone and on the surface seems like a perfect solution. The problem comes when the paving material is of a variable thickness, which is often the case with imported Indian sandstone and limestone paving. As of January 2011 all the stone supplied by London Stone will be calibrated to a uniform thickness of 25mm, but a lot of the imported stone is still supplied in 15-40mm thickness. We often receive calls from clients whose contractors have installed a concrete base for the paving to be laid on. The said contractors will often have allowed for a paving depth of 25 or 30mm and not taken into account the fact that the paving can be as thick as 40mm.  The problem that this creates is that a difference of 10 0r 15mm can often take the finished height of the paving over the height of the damp course. The cost of ripping out a concrete base is very expensive so in our experience people will either opt to go for a thinner, often unsuitable paving material or will opt to leave gravel strips around any brick walls to avoid breaching the damp course. Both options are flawed and will result in a sub standard project or a undesirable finish. The best advice we can give is to work very closely with your contractors and keep them well informed of material specifications.  Good communication is the key to avoiding expensive mistakes on any type of construction project.

By London Stone Blog | Published 19th November 2010
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