The insulation line type is a 'symbol' line.
You would have to duplicate it and then edit it.
You can copy the pattern, paste it in your plan, resize, then copy it back into the new duplicate line type.
You can use a simple wall that uses a building material that has an insulation fill (fit to skin).
Then you can place a wall of any thickness and the insulation will fit.
Barry.
One of the forum moderators.
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