Joined: July 2004
||Posted: 14 Jan. 2020,13:51
You *could* rely on Day Joints between alternate bays of the concrete base, but for what it costs, I'd slip in a bit of fibreboard or similar just to make sure there's room for movement.
Then don't fret about the paving joints: let them land where they will. They act as the weakest point in the pavement surface, so any movement will reflect through them, zig-zagging as necessary in most cases, althoughh, if you are using units larger than say 600x600, there may be the occasional cracked flag if the bond between bed and flag is particularly strong. The alternative is to mirror the Movement Joints by creating full width joints in the paving directly above the MJ, but that can sometimes mar the look of the finished project.
I'd *always* use a DPM with concrete, regardless of the season. It maintains the critical w/c ratio while the concrete cures and then it offers protection against corrosion from aggressive groundwater, which should always be considered in indiustrial/urban areas or anywhere mining, tanning or steel-making took place.
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