Talk:Gold Brick/@comment-68.228.204.134-20130118234226/@comment-4674838-20130118235341

No, bricks or blocks (any kind) never ward off monsters. However, the presence of multiple NPCs at your house does decrease the monster spawn rate (eventually, once you have a certain number of NPCs collected at your house, monsters will completely stop spawning near the house).

Additionally, monsters cannot spawn in places where you have placed walls in the background such as inside NPC rooms.