Colour variations can occur within packs, therefore: Ensure your sample and blocks are from the same factory. Block paving should be ordered from the same batch number to avoid colour variation. Do not mix blocks from different factories. Bradstone cannot accept responsibility once blocks are laid from different batches. The responsibility of ensuring this is correct lies with the landscaper. Best results are achieved through mixing from 3 to 5 different packs and from vertical columns rather than horizontal rows. We recommend a neoprene faced or rubber sole plate on vibrating plate compactors to reduce scuffing (specifically on our Stonemaster, Braddrive Cobblestone ECO and Woburn Original ranges). Light colours are susceptible to staining and care should be given when selecting blocks for driveways.
Differential weathering can cause patchy dark discolourations on the surface of individual units. Again this will generally diminish over time and will not affect long term performance. This is due to differential weathering where the surface of the paving has cured at different rates. All decorative products will weather and change appearance over time.
Efflorescence can appear on all paving products as white patches or a lightening of the surface colour, but seems to disappear when wet. It is formed by a normal chemical reaction which causes calcium hydroxide (lime) to migrate through the damp paving surface and then react with carbon dioxide in the atmosphere resulting in a deposit of calcium carbonate crystals. Efflorescence is very unpredictable in its occurrence and can happen at any time of the year but is more prevalent in winter.
Although there are cleaners available, efflorescence is a natural phenomenon and will generally disappear with the natural weathering process and the passage of time. It does not compromise the integrity of the paving. Aggregate Industries cannot accept responsibility for the effect of efflorescence which can be a characteristic of all good quality products with a high cement content.
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