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 You don't mention what era you are modeling, which would be helpful to know. As mentioned above a 6" thickness is now standard. In the past sidewalks as thin as 2" of concrete were common. In the relatively 'tiny' scale you are using I'd suggest you trust your eye for suitability. If you decide on styrene thicker would likely result in less warping due to shrinkage in the substrate and heat deformation. Avondale's ideas on heaving and crackage were very insightful...I intend to make use of them. Scribing the prototype 3 to 4 foot crackage lines may look a bit too close. As always in scale perspective work "If it looks right it is right". Randy
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