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I'm blocking up a doorway in a brick wall. I've decided to block it up using a stud wall as that should be a bit easier than bricking it up.

I know that the bricks are 11cm depth plus approx 2cm plaster on either side so totaling around 15cm

The stud work would be 10cm depth plus approx 1cm plasterboard either side totaling around 12cm

How will I ensure that the stud work and plasterboard end up being the same thickness as the plastered brickwork?

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up vote 1 down vote accepted

Add shim strips on the face of the stud wall that add up to 3cm. A bit less is usually better, and then you makeup any deficit with mud (joint compound). Since this is a lot of material, you might just place the shims at regular intervals, such that you can screw through them to attach your plasterboard.

I like to glue and pneumatically nail such strips with 18 ga or thinner brads..

On another tack.. What about splitting the stud wall in two, make each 5cm thick, attach the top-bottom and sides to the original frame and leave a 3cm air gap between.

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