Posted February 3, 2013 This is on a built floor (not a ground tile) : Tested on stone brick and slate shingle floorsI've tested it in a few buildings now, some with writs I hold some without, I've had other people test this too.This was tested with mallet, hammer, and trowel (just to be sure)This is stopping people from building multi-story as there is no "plan XXX above" option - in fact, if you have a constructed floor, even on the ground level, you can't build anything, including your roof. Share this post Link to post Share on other sites