So, to add to this - I'm in the process of renovating the Master Bedroom - one section of wall had a hairline crack that no amount of sanding and filling in with Gibstop putty would fix it.
Eventually I decided the cut out a V section, in order to get a greater surface area for the putty to adhere to and to cover the crack...
Turns out that it's actually a thin strip of GIB (about 20 mm wide) that runs down that section of the wall, to account for the fact that the 2 larger sheets of GIB don't line up. To make matters worse, this thin strip of GIB isn't over a Stud.
I widened the gap a bit to about 30mm - so that some of the strip would be over the Stud, which in theory should give it enough structural strength - I don't particularly feel like re-GIBbing an entire room - that's a bit outside my current Time and Skill limitations.
After much swearing and cutting/trimming/breaking/cutting/trimming/breaking (repeat several times) a replacement GIB strip - I got it in, Taped it, puttied it, sanded it down - looking good, painted it - Life was good, wall looked nice...
Then after one of the recent Jolts - guess where there is a hairline crack again....
Physics; Thou art a cruel, heartless Bitch-of-a-Mistress
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