Again, I'm not an expert on Sempervivums, or house plants in general (although I do have quite a few of them), so I hope someone with a more definitive answer can weigh in on this subject -- but it's always been my understanding (and experience) that houseplants, especially succulents, don't like to have that much "elbow room." I really think you'd have a better chance of success by putting it in a pot that's just a bit larger than the current root ball, and use a succulent-type potting mix.
