EXPANSION JOINTS- Trims Settlement, deflection, expansion, creeps, shrinkage, thermal and moisture excursions, all these factors contribute to movements and solicitations on the building’s structure frame. It is then advisable that a proper expansion and structure joints layout planning is implemented both during the slab/mortar-bedding phase and at floor level. Planning for the right type of joint is a task, which involves the calculations of the movement solicitations, tensile strengths and the thermo-hygrometric coefficient readings, in relation to the type of construction and relative coverings and to how they interact with all the combined building materials. The underlying mortar bed sectioning is a determining factor in guaranteeing a job well done, whether the covering is laid with the thin bed adhesive or the traditional deep bed method. An expansion joint must be placed whenever: In correspondence to an underlying substrate material change or alteration and/or slab casting discontinued placements. In correspondence to pre-existing discontinuities in substrate such as structural construction joints, screed section edges. In correspondence to fixed elements like columns and doors, entrances. Where there is a change of direction in tiling patterns. Where tiled floors abut walls or restraining features. The resulting bays should be as regular as possible. The proportion between the two bay sides should generally not exceed 2:1. For information visit www.profilitec.com