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.
Upgrades & Design Ideas For Stained Concrete Pool Decks. As mentioned above, staining a concrete pool deck tends to cost anywhere from $1.50 to $12 per square foot. However, that is for a stain applied to an existing concrete deck. Pouring the deck itself, should that be necessary, will bring with it additional costs that tend to be upwards of $10 per square foot.