Insulation properties of building materials

A link to the insulation properties of building materials.

Some of the R values quoted appear to be outdated or may be different due to variations in US materials.

Material:-------------- R/inch
loose f’glas--------------3.0
f’glas batts--------------3.5
extruded p’styrene-------5.0
p’styrene beadboard-----3.6 to 3.8
urethane foam-----------6.0 to 6.5 (depending on quality)

Thank you for your input.
I though it might help others.