Joined: July 2004
||Posted: 26 Nov. 2017,10:37
There are a few possible causes for this 'phenomenon'.
1 - shade
2 - blocks of varying porosity
3 - poor drainage of bedding layer
4 - poor drainage of sub-base
5 - incorrect jointing
....at this time of year, and assuming it doesn't start to settle or deteriorate, I'd be very tempted to leave it until the Spring and see how it looks in, say, April. If it still has the same damp spots then, it might be worth investigating further.
Just to be on the safe side, I'd suggest puting your concerns in writing to the contractor, stating that you will review the situation in Spring and would appreciate their attendance at that time, if necessary.
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