Websters:
1ga·rage
noun
\gə-ˈräzh, -ˈräj; Canada also -ˈrazh, -ˈraj; British usually ˈga-(ˌ)räzh, -(ˌ)räj, -rij\
Definition of GARAGE
1
: a shelter or repair shop for automotive vehicles
The OP said "Garage".... IF he was in Calif. (I don't know where he is from), the code specifically states: 406.2.6 Floor Surface "Parking surfaces shall be of concrete or similar noncombustible and nonabsorbant material."
So, I guess the answer is, it depends on which state and which code you are using...... and which fish you feel like frying.....