There are three principal layers; 1  External intercostal muscles aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12. 2  Internal intercostal muscles aid in forced expiration (quiet expiration is a passive process).
Costs. A professional concrete contractor will typically charge $2-$4 per square foot for a simple stain application, including the sealer. A stain application with patterning and sawed lines will typically cost between $4 and $10 per square foot.
Stained Concrete Cost. With staining, itâs often possible to dress up plain gray concrete for less than the cost of covering it up with carpeting, tile, or most types of high-end flooring materials. When comparing the cost of stained concrete with alternative flooring materials, such as carpet, tile, or hardwood, don't forget to factor in longevity and replacement costs.