Help needed from decorating experts amongst us?

bobfog

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Feb 7, 2016
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A couple I am friendly with had a garage conversion into a playroom. The doorway that originally opened into their utility room was sealed and a new doorway put in the hallway so the room feels more like part of the house without the need to access it through the utility room.

Anyway, that's the background, here's the problem. The old door way was sealed up with a 2x4 frame, insulated, plaster boarded and skimmed. Now on one side of the wall and only on the right hand side of where the old door used to be there are cracks forming in the plaster and a ridge appearing as if the two piece of plaster are coming together and creating a "mountain range" at the joint.

But what's puzzling is three attempts have been made to get it right, the initial work by the builder who did the job, him returning to try to rectify it and a third time when a independent decorator came to look at it at the request of the builder. Two things in particular strike me as odd:

1) The problem happens slowly over a periods of weeks with the ridge getting to its worse after about a month, so any filler, etc in the joint should be rock solid and dry by then, what's being squeezed to make the ridge?

2) It's only happening on one side of the doorway patch.

Any suggestions? I'm thinking maybe sanding back to plaster and trying to stabilise with PVA or possibly filling it with a 2 part car bodywork type filler, thoughts?

Any help greatly appreciated.
Bob.
 
I'm guessing joint tape was used for all the repairs.

Makes me wonder how the construction is of the opening and wall. Also curious if the foundation is moving due to rain/drought or if there is a second floor above that's affecting this.

Just some thoughts.
 
  Does this crack on the one side go straight down to the skirting / floor, or does it stop someway down? Have they tried putting in extra screws on either side of the crack and then re tapped. If this problem has had three attempts to fix it without success, and all the obvious fixes don't work I would be inclined to cut the plasterboard away and have a look at the stud work behind.
 
From my experience it is highly unlikely this is due to some sort of poor plasterboard or lack of screws problems in the wall board. This type of compression tends to be framing related. While it is possible that there is some sort of air or moisture leak that is causing the plasterboard to move at a different rate at that side I doubt it. i would want to pull the wall board off one side completely and see whats going on with the framing. Maybe they did a lousy job, maybe they took out a stud that was supporting the door header.
 
I know this is a UK based post and plaster if quite different from drywall. That being said. If my drywall work cracked within a month id be VERY concerned about settling or movement. Could a wild swing in humidity be affecting the wooden framing or lathe? The only thing I could think of is some intense expansion and contraction that telegraphs to this one weak point.

The other more concerning option is serious settling. Interested in the outcome so keep us posted.
 
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