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.
Prices for acid stained concrete can fluctuate considerably. While you should never take the prices below to heart, it will give you a pretty good idea of how much your particular acid stained concrete project can cost. As always, if you need firm pricing information, please contact us at Harmon Concrete and weâll give you a 100% free estimate! When trying to estimate the cost of your project, there are several factors that could impact the final cost.