Prepping and Filling Big Gaps Around Window Fillers, sealants and adhesives for all types of DIY work. Help, advice and information on all aspects of this subject

[Moveonup]

Please see the four images uploaded onto the google drive link below.

I need to prep and repair the area around the window. I feel the right thing to do is pull out all the old silicon filler and re-fill.

What I find a little daunting is the size of the gap to fill.

How is the best way to do this and what should I use, expanding filler, silicon ??

https://drive.google.com/drive/folders/0B-Qaks6IaaSaaWFuc2VXdFlsLTQ?usp=sharing

[welsh brickie]

you can fill the gap with expanding foam, then instead of filling over it with silicone you can buy small plastic trims to cover the gap. Try https://www.gap.uk.com