On 25/05/2020 18:13, Caecilius wrote:
On Mon, 25 May 2020 17:52:48 +0100, Andy Bennet
wrote:

On 25/05/2020 17:42, Caecilius wrote:
One of my internal doors slowly swings fully open unless it's latched
closed. None of the other identical doors do this so I think it's
something to do with how it's hung, but I can't find any obvious
problems. It's a solid hardwood door (so pretty heavy) hung on two
brass hinges.

A spirit level shows that the door frame on the hinge side is
vertical, and the hinge side of the door is vertical as well. A plumb
bob made from a nut&bolt on a piece of string shows that the two
hinges are in line vertically.

Any ideas on what could be causing this?


Either a bowed door or wind.

It's not wind, as it happens in still air.

But a check with a straight edge shows that the door is bowed
slightly, and the others that don't swing open aren't. So I think you
may have found the cause. Thanks.


If the door is bowed and currently sitting on 2 hinges, you could add a
third hinge in the middle which may reduce or eliminate the effect.