From everything I have seen it would be about 12 inches for conventional fiber glass insulation available from Home Depot or Lowes.
Polyiso insulation can give up to r-6 per inch. That equates to 7 inches for r-42.
An R-value indicates an insulation'sresistance to heat flow. So, thickness will depend on the material used.
6 inches
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I need a manual instruction of Kenwood multiplayer DP-R28
about 9 1/2 inches thick
The value of R is 6.8. This is in half inch rigid form.
loft insulation, draught proofing cavity wall insulation thick curtains thick carpets double glazing
Rigid insulation by DOW makes many different types of insulation, most have a foil side which should be glued to the concrete while the colored side with logos on it will face out ready for walls to be framed and sheetrock to be hung.
A thick mug.
A thick mug.
Usually the wrap iss installed first. Rigid foam insulation is often installed outside the building wrap, and batt insulation is always installed inside the building wrap. This is because batt insulation is much more moisture absorbent than most rigid foam so needs to be protected from external moisture. So batt insulation will not be installed until after the building wrap is in place to protect it, and externally installed rigid foams are not fixed in place until after the wrap is in place because they are fixed over it.
A thick mug.
The thick outer layer of a plant cell is called the cell wall... 8) A.I
If someone were interested or looking to purchase rigid foam sheets for insulation purposes they could most likely check their local hardware stores as shipping would be rather extreme depending on size and weight.