I found the sand to be a waste of time. In summer loads of ants worked hard
taking all the sand out. I brushed dry cement in and that stuck to their
legs and they did not come back. When the rains came the cement hardened and
helped to keep the weeds away. I use a spray on weed killer for the
gaps upto just below the top of the blocks. Any bits that were on the blocks
I swept clear with a soft broom. I have charcoal blocks as well. I have
found that my snow covered drive clears quicker than others in my road who
have brick coloured blocks. I suppose the dark colour heats up quicker?
cover so will start in an unobtrusive area and distribute it with a soft
broom. Life is too short to fill gaps individually.
My frontage is mainly reddish bricks with bays bordered with charcoal
and I have not noticed the dark ones thawing quicker.
One or two blocks did stay snow covered when others were thawing so I
wonder if it is to with thermal contact to the ground below?
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