"R" is a value associated with heat penetration.
The thickness of a material (for example, typical pink panther insulation) of any "R-value" will vary. If, for example, your wall space involves either a 2"x4", 2"x6", or even 2"x8" wall space then the material you insulate with will, of course, vary in size, however the "R-value" of your material will remain its rated value.
It depends on what "5 thick" is: 5 inches thick, 5 feet thick, 5 yards thick, 5 miles thick etc.
What is the r value of water 2 feet thick
Depends on the MFG, and type. I have seen R19, from 5 inch to 6.5 inch in thickness.
it is about 5 foot thick.
1.5-5 cm thick
The 5 is thinner. The 4 is .28 inches thick, and the 5 is .24 inches thick.
5 to 8 KM thick.
Very thick, 3-5 feet thick.
The walls were 5 feet thick!
5(r+5) is.
5 millimeters
5 to 25 miles thick