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.
Patina Concrete Staining-Average Cost Per Square Foot. Expect to pay in the high end of the estimated price range for a licensed, bonded and insured contractor and for complex or rush projects. Hire carefully, only after verifying prior work quality.or a basic 125 square feet project in zip code 47474, the benchmark cost to Stain Concrete Patina ranges between $3.05 - $3.88 per square foot* .