How to add/fix architrave to existing frame

Soldato
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I've got a missing side of architrave after inserting a new steel beam. It previously had an old archway, but I've since opened up the room to be open plan.

The existing architrave is circa 30mm in width and Ive bought some which is 70mm in width. The new architrave has a slight radius on the end and I can cut it down on one side (it doesn't match existing edge though so can't just do one side of the frame ).

What would be the best way to remove the other side also? (recently reskimmed). I was thinking of using a multi tool and cutting out the side?

Then sticking new architrave down each side? Is it best to use nails or glue? Can filler cover any small issues in framing to existing shape? I'll paint both sides after.

Should the new architrave be cut down to similar size as existing other ones?

If it's a better job left to a carpenter, Ill end up getting one in to fit other doors, but seem to struggle getting them in to do any jobs (no trouble with other tradesmen)

Pics:

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Good call on the multitool.I did just that on 7 linings and doors+arch a few weeks ago
Remember that if the new architrave is wider you will probably want to rebate the back of it to let it sit properly to the door frame
after taking off the old architrave scrape/sand and fill smooth then cut the architrave and nail with some thing like 1.5" pins is my recommendation
 
Good call on the multitool.I did just that on 7 linings and doors+arch a few weeks ago
Remember that if the new architrave is wider you will probably want to rebate the back of it to let it sit properly to the door frame
after taking off the old architrave scrape/sand and fill smooth then cut the architrave and nail with some thing like 1.5" pins is my recommendation
Did you manage to avoid making a mess of the plaster work when removing the architrave? (did you go from the plaster side or the door side?)

When you say rebate I assume you mean reduce the depth so it aligns with the plaster? What would the best tool be to do this? I've only got saws, multi tools but can buy woodworking tools if its an easy enough job

Are these the sort of pins youd suggest?
https://www.screwfix.com/p/easyfix-panel-pins-1-4-x-25mm-0-5kg-pack/12998
 
Yeah no damage to plaster.prise archtrave from door side carefull with wide chisel and or a flat nail bar.As for the rebate you may not need to depends on dept of plaster.I used an electric planer
pins look ok,I use 32mm ones except on oak when I use those pins you linked to
 
Yeah no damage to plaster.prise archtrave from door side carefull with wide chisel and or a flat nail bar.As for the rebate you may not need to depends on dept of plaster.I used an electric planer
pins look ok,I use 32mm ones except on oak when I use those pins you linked to

Did you have to cut first with multi tool prior to prying open with a chisel/nail bar?

Thanks for your help
 
Finally got round to this today! Got the architrave off OK and cut the new architrave to size (ordered an mdf set with the skirting... Hopefully once painted will look OK

Bought an electric plane to square up the backs with excess plaster and will fit tomorrow
 
You've solved it now but just thought I'd add that gluing then clamping in place architrave has always worked for me.
Agreed glue/clamps would be my preferred option but for this door into a relatively narrow hallway the clamps wouldn't work/have anywhere to grip

I'll post up some pics when its done maybe as long as its not too bad :p

Got one side of unprimed mdf to paint. Reckon it will need painting with a primer (eg Zinsser ) before gloss?
 
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