Leave a 1/4 gap between the tile and walls. Do not walk on fresh tiles for about 24 hours until they set. When tiling counters, lay out tiles from front to back. Begin with counter trim then set full tiles on the first row working backward, so all cuts are made on the back row against the wall.
Atrophy is the general physiological process of reabsorption and breakdown of tissues, involving apoptosis.When it occurs as a result of disease or loss of trophic support due to other disease, it is termed pathological atrophy, although it can be a part of normal body development and homeostasis as well.stronauts in microgravity must exercise regularly to minimize atrophy of their limb muscles. There are many diseases and conditions which cause atrophy of muscle mass. For example diseases such as cancer and AIDS induce a body wasting syndrome called  cachexia , which is notable for the severe muscle atrophy seen.
Optic atrophy is the final common morphologic endpoint of any disease process that causes axon degeneration in the retinogeniculate pathway. Clinically, optic atrophy manifests as changes in the color and the structure of the optic disc (cupping) associated with variable degrees of visual dysfunction. The term atrophy is actually a misnomer, since, in its strict histologic definition, means involution of a structure due to prolonged disuse.