How (with what) would you fill this gap?

[MrDavidRoberts]

I have a gap that I left between old door frame and architrave (architrave is fixed directly to new tiles hence the gap in the thickness of the tile). I thought I will just fill it out with caulk/paint it and it will blend in with old door frame... However started filling the caulk , and that thing dries to semi squishable substance ( like an old chewing gum). I realize I should have put in a new Door frame to tie everything together nicely but that's no longer an option since everything is finished.

How would you fill this gap so that it's easily tied together with the old frame and would be paintable to match the old door frame?
I'm not sure if using a wood filler would be a good idea since it may crack up due to movement?

 

[novocaine]

I'd cut a strip of wood and nail it in. or I'd rip the architrave off and rebate the back of it to sit closer to the frame, most likely the second option.

 

[AJB Temple]

As above, bin architrave. Rebate a new one. That is a huge gap and you will never hid it properly.

 

[Bm101]

Can you post a picture of the reverse side from the tiled side? Is it sealed to the tiling? :shock: If you can't replace the architrave think I'd be tempted to glue/wedge in a few bits of waste to act as support then add the thickest strip possible to the side, glued and pinned. Over sized and plane it down to fit. Novocaines solution is probably better if you can accurately rip that length of wood.
While on the topic, I bought a tube of intumescent acrylic a while back. I've sanded, filled and painted the front door 3 times in three years. Sod that. Thought I'd try this gear out. Normally used round fire doors etc it swells under enough heat to block smoke passage etc. What got me was the movement rate at 12.5 percent. Thinking at the time was, well the paint might crack but that's a quick sand, a refinish but not a repair as such. Long story short, decided the front door has had it and better off replacing so the old intumescent gear has sat in a drawer. Been doing up the front room lately. Looked at the pine sash bay. The sill was badly fitted and had big gaps between the three sections. Bit cupped etc. It's above a rad. Planed it all down flat, put a 2 part wood filler in but left it shy. Shrank as it dried so I had a 3mm odd gap left. The gap between the windows and the sill was also shot to pieces and shabby. Gunned the intumescent gear in in a moment of kill or cure madness.
(hammer)
Very early impressions:
24 hour cure time.
Finishes well with the old spray bottle, water and fairy liquid and a teaspoon handle trick but not quite as well as a 'pure' mastic like sealant. Use a little more fairy than normal. More than you would add to washing up water.
Dries fairly hard, takes sandpaper/finishing well.
Takes a coat of one coat undercoat well. In fact if you're a picky sod about your painting, it takes 6 coats of one coat undercoat well, finely sanded between coats.....

That's it so far. Time will tell but I have a feeling its a good solution.
Mind you people used to have a feeling that the World was flat and look how that turned out. :roll:

Any opinions?