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<div class='quotetop'>QUOTE(another_guest @ Feb 16 2007, 12:03 PM) [snapback]279542[/snapback]</div>

<div class='quotetop'>QUOTE(the_fifth_horseman @ Feb 16 2007, 12:09 PM) [snapback]279527[/snapback]

That "erosion" happens only when you don't build them on concrete slabs.
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Hm, I thought there was always some slow erosion happening, in the vein of a few % per hour on normal speed. But indeed it was significantly higher without concrete slabs.
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Yes, there is erosion (at least in the version I used to have) it's slow indeed and it's not related to placing your buildings on concrete slabs. If I remember correctly, the erosion only happens after the first couple of levels (after the learning/basic ones), it affects all buildings and as a result some of them won't function at 100% capacity (wind traps and spice storage are a good example). Also the building upgrades can only be done on fully repaired buildings so eroded buildings can't be upgraded until they're repaired. The enemy buildings never erode. And I think the erosion stops at 50% (stays at minimum level of green, doesn't go into yellow).