The Window To Seal Sandstone Paving Has Now Passed

We are now in the middle of October and the weather has taken on a familiar Autumn feel.  I recently responded to a post on written by someone who was desperate to get his Raj Green Sandstone Paving sealed before winter set in.  He was particularly concerned because he was in a north facing garden that featured lots of trees and vegetation.  Rightly so he was concerned about the effect that the damp conditions would have on his newly laid sandstone patio.  Natural stone paving and north facing gardens are not the best combination in the world.  Usually in terms of sealing, the advice I give to my clients is that sawn paving should always be sealed and that riven paving does not need to be sealed.  If you do have a north facing garden though my advice would always to be to seal your paving whether sawn or riven.  North facing gardens can be damp at the best of times but in the winter they can become sodden with water and moisture.  The pores of natural stone paving are the perfect breeding ground for algae.  Sealing the stone will massively reduce algae growth but unfortunately in the case of the person who has posted on paving expert he has left it too late to seal.  In order for natural stone sealant to work properly it needs to be applied in dry and ideally, warm condition.  At this time of year, we cannot guarantee these type of conditions and even though paving can look dry it is often still very damp inside.  If sealant is applied in these conditions then it will simply fail to take resulting in unsightly white blooming on the surface of the stone.  My advice to the client was not to worry and wait for spring.  There is a good chance that his natural stone will get messy over the winter but there will be no permanent damage caused.  As soon as we get better conditions the stone can be cleaned and sealed

By London Stone Blog | Published 15th October 2013
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