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- No. Many slates have a uneven surface or “cleft” which may cause discomfort on bare feet, but if properly installed should not be a hazard. However, the cleft of a slate can vary greatly and should be considered when deciding which type to use. If an uneven surface is cause for concern, there are honed ( smooth ) slates available. There are some slates that naturally have a smoother surface such as slates from Vermont and Brazil.