Most schist contains the mineral mica and is called mica schist. Schist is often used as a guide to measure specific sizes and dimensions of objects. Before the 18th century, schist, shale, and slate were used interchangeably to describe the same rock.chist Rock Facts. Schist is a metamorphic rock that contains flakes of mica. Schist can originate as a sedimentary rock or igneous rock. It can contain different miners. Interesting Schist Rock Facts:
1 Insulating the garage overhead door is another way of cooling the garage in the summer and keeping the space warmer in the winter. 2  For an uninsulated metal door add a two-inch thick layer of rigid insulation attached to the inside of each panel with contact cement.
The insulation retards heat transfer at the east facing garage door so it doesn't heat up during hot summer mornings. The grates face south and keep the garage from heating in the afternoon. Because of thermal inertia and deciding when to open the garage door for natural cooling, the garage is now almost always cooler than ambient, except only if a cold front blows through the Chicago area.