Fitting architrave when plaster is proud of door frame

3 Aug 2016
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United Kingdom
As the title. Standered 45mm taper architrave, the plaster in some places is 2-3mm proud of the door frame/lining. (This is what the original architrave I have removed was fastened /bodged onto)

Do I rebate the architrave over the plaster so I can get it to sit flush on the frame. (Will this cause a problem fitting skirting?)

Bring out the door with wood. (Whats best to fill the 2mm step - can only see strip wood in 4mm)

Fit it as best as I can and fill gaps where they appear with caulk.

Any better options?

Will all be painted when done.
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1. Cut back the proud plaster where the architrave will gi using a Stanley knife and old chisel. Fit architrave. Fill to edges of architrave to make good.

2. Cut thin strips of material and fix to front on door casing to build it out, ideally step back 5 to 10mm. Fix architraves to this, again stepped back. This "double reveal" avoide the inevitable cracking joints that otherwise might occur

3. Rebate the backs of the architraves with a power planer

All three work, but in your case I'd opt for number one as being the least work
Put a few 2/3mm packing pieces on the frame, fit the architrave, fill the wall gap with caulk, and fill the door frame gap with 2 part wood filler.

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