specifications. If your vehicle was originally charged with R12 refrigerant, for example, the oil type specified, 'mineral', will not apply. Additionally, General Motors issues Bulletin # 02-01-39-004B replacing PAG 150 oil with a lower viscocity oil.
The term square in reference to roofing materials refers to 100 square feet of roof area. One square of slate is the amount of slate that it takes to cover 100 square feet of roof area. A 10 foot x 10 foot section of roof would equal one square. So would a 4 foot x 25 foot section. Ditto for a 5 foot x 20 foot.
Instead of the typical square feet used for many other building materials, roofers rely on squares. A square is equal to the amount of tile needed to cover a 10 by 10-foot area of roof, or 100 square feet. Keep this in mind to more accurately compare estimates as you price your concrete roof project.