Joined: July 2004
||Posted: 22 June 2017,10:55
The ants *will* be creating tunnels and nesting chambers in the laying course sand, and, over time, these will collapse and there's a risk the paving will settle ever so slightly.
This may not be much of a problem if there is plenty of fall on the pavement, but on flattish surfaces, even a millimetre or two of settlement can lead to ponding, and, from then on, the problem ony ever gets worse. Never known a pond get better over time!
They key is to keep the ants (and other burrowing/mining insects) out of the pavement and Craig's generous offer will certainly help minimise the risk by effectively blocking their way into and out of the bedding via the jointing.
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