Paving slabs

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Hello does anyone no why my new patio is changing colour, sorry only picture i have atm
 

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What colour was it in the past, and how does that compare with the colour it is now?

is it sandstone slabs, or concrete?

What have you been cleaning it with?
 
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What colour was it in the past, and how does that compare with the colour it is now?

"Formed from wet cast concrete"

What have you been cleaning it with?


?
 
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Nothing yet its only 2 months old. The colour is a buff colour it shows it on the link i posted so they are turning darker and brownish
 
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if it is getting darker, it is probably damp from water penetration, especially if there is muddy ground.

I have slabs with a good fall so rain runs off, towards the lawn which is lower, to drain away. The slabs are set in mortar so not much absorbtion from below.

My neighbour has his slabs flat, so water lies on them, and they are certainly darker and dirtier than mine.

Yours don't look brown to me.

Damp concrete usually goes a darker grey.
 
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Mine is laid on 6inch thick bed of morter theres no mud underneath
 
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