Perimeter expansion joints in tile assemblies essential and required in order to accommodate building movements and to prohibit cracks in the substrate from telegraphing to the tile finish. Perimeter expansion joints are required at all changes in plane and terminations of the tile. This detail illustrates a perimeter expansion joint where the tile floor terminates into an inside corner of the tile walls. The detail comprises two horizontal expansion joints where floor meets walls, and a vertical expansion joint at the inside corner of the two tile walls. Backer rod in each of the joints prevents three-sided adhesion of the sealant. Compressible filler is used at the backer board terminations in the walls to allow independent movement within the walls. Joint width of perimeter expansion joints are as specified by the design professional. Sealant type shall be specified by design professional and shall be compatible with other components in the system. This detail is based on Tile Council of North America (TCNA) method EJ171I. Details that show different or modified concepts or methods can be of equal validity and should not be excluded from consideration. this detail shall not be used for construction without the approval an signature of a licensed design professional. The person using this detail shall be responsible for its complete design and proper application.
