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Internal doors don't sit in frames, the technical term is a door liner. The door liners are fixed to the wall they sit in by mechanical means (shimmed at fixing points to keep the liner straight and plumb). Traditionally this is done using masonary or cut nails, but now days using screws and plugs. These fixings are hidden either behind the doorstops on the frame (in the case of good chippies) or with filler.
I'd be surprised if they moved having been left without support.
Bobbo
@Nef
So, replacing the fucked pine floor in my hall. Around the door frames I’m cutting the old boards back around 2cm so that the architrave is overhanging, leaving me space to slot the new boards under.
My concern is that some of the frame isn’t directly over a joist, and surely must rely on the floor between the frame and the joist for support. But obviously if I’m cutting that away, I’m taking away an amount of mechanical support. I’ve added this board to bridge the gap, is this right/sufficient?
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