Correct positioning for bifold frame

samedi 8 août 2015

I recently purchased some bifold doors that have a 140mm jamb/sill/head. I need to install the door into a 90mm wall external wall. I assume that the jamb extends 10mm inside past the wall frame so that once gyprock is installed a casing can sit evenly across the gyprock and jamb. Is this correct? Any advice would be appreciated, thanks!

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