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oOorolo t1_j1u5r0u wrote

It's so shims can be inserted to make sure the door frame is vertical and plumb. Rough openings are exactly that, rough openings, and are rarely perfectly square and plumb. The gap and shims give you room to adjust it so your doorway is square

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SloightlyOnTheHuh OP t1_j1u62cv wrote

Cool, so if I frame the rough aperture fairly square can I slim down that 5 mm each side because I know I'll have removed most of the error in the outer framing? I'll only have minimal tweaking to do I hope.

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oOorolo t1_j1u6vz9 wrote

You can, but the idea of having a minimum 1/4 inch or 5mm is pretty standard practice, so you can insert 2 wedge shims, one per side to square your frame. Leaving a smaller gap leaves less room for shims and my result in a twisted frame if only 1 shim can be inserted.

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