Expanding Foam, Trim, Both

[charliegolf]

Hi all. Been helping nephew with his 'new' bungalow, and there is water ingress around this window. The window is bowed at the top (a builder recons it wasn't measured for this house, so was bodged), and a big gap below the lintel. The window will be replaced when he has more money, but it's winter. Looking in, I can see foam on the inner side, just visible on the pics.

Questions: Can I just fill all the void with foam, trim and paint? Do that and add a trim? Just add a trim and seal up?

All advice welcome. Ta.

PS the staining seems to suggest there was a trim...

I had a wider angle pic, will try and upload.

 

[motorbiking]

Just make sure the trim doesn't allow water to run down the inside. silicon or mastic will help. apart from that expanding foam is fine.

 

[Wayners]

I'd just like get some uPVC trim and stick on with polymer mastic
Eurocell or other trade centre for around £7 for 6m length so Its cheap.
DIY also sell but don't know prices

 

[^woody^]

That's a small gap.

For the cost and time of foam, mastic/adhesive and trim, you may as well just squirt two tubes of mastic in and smooth it with your finger.