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. Stained concrete is achieved by applying color to the concrete after it has cured. This is a great option for updating your concrete, as it can be done years later. For example, many are choosing to update their basement flooring by removing the carpet and staining the concrete underneath.