Dear Houzz Customer - Thank you for your interest in our products! You can use our murals in a bath as long as the mural won't be in direct contact with water, as in a shower stall. We also like to caution against installing a mural where it may get hair spray or perfume overspray on the print, as these chemicals may remove some of the printing. Generally, a humid environment won't have any effect on the mural adhesion as long as the surface was correctly prepared. I hope that this helps you in your decision making process. Thanks so much! Jeanne - Magic Murals