#Terraria house minimum free#

However, even if you build your walls out of blocks the crimson can't convert, the crimson does not need a direct connect path to a block to convert it. The best way to protect your entire area is in fact to either dig a gap or place non-spreadable blocks between you and the crimson.

#Terraria house minimum free#

If you build beneath the surface then you will need to keep a perimeter of 79 blocks free from crimson/corruptions (less if you are not at least that many blocks beneath the surface.) So, taking (pi*45^2)/2 is area of 3180 blocks or basically you need to keep the crimson 56 blocks away from below you and around you on the surface. So if your entire base is above ground and crafted blocks, then only the area below is of concern. Also note that planting sunflowers will negate some of the detected blocks (5 blocks per sunflower). Consider that certain natural blocks don't corrupt (air, mud etc) and you are likely surrounded by other crafted blocks you may not have to worry. It checks this area and determines if more than 500 blocks are crimson or corrupt. The effective area for detection by NPCs is 45 block radius. However NPCs will abandon them if crimson gets too close. You houses only need 1 block of suitable material surrounding themselves, and the viable blocks for making houses are ones which are unaffected by crimson spread. Blocks which are crafted are typically safe. Those listed blocks (and some of their alternate types) are the only blocks that actually convert. If you're houses are made of anything except sand, grass:dirt, ice, normal stone, or mud* then the crimson cannot spread or convert them.