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.
When you put in an insulation panel on your garage door, you're adding to the weight that the springs the door opener has to carry. The door will need to be rebalanced and the spring tensions adjusted in order to prevent breakdown. Seal the bottom of the garage door. Don't forget to seal the bottom of your garage door as well, in order to prevent wind from going through the door bottom. For this, use a garage door threshold kit. This will keep out the wind, dust, water, leaves, and pollen from your garage.