rigid insulation thickness for a condo/townhouse

goldberg245

i used 2"blue rigid insulation on the 2 exterior walls (front and rear of unit)
which gives me r10 and framed in front of that and filled with roxul safe n sound.

but for the divider walls ( we are an inside unit ) how thin (r value?) can i go...
1/2 " pink has a r3 and goes up from there

im in kitchener ontario so im trying to do it to code

any help would be great

concretemasonry

Why would you want to insulation the interior walls from the heat of the adjacent unit?

The only reason, I could think of would be to Roxul for reduced noise transmission between units.

Dick