I was about to redecorate a room but it had a crack down one of the corners. I was going to do a simple fill but on closer inspection it had already been filled with some flexible type of material, possibly caulk. This itself was cracked so I just started to pull it out. It mostly pulled out in one piece and has left me with a 2-3mm gap between the plastboard in the corner.
There's about an inch gap through the gap to the blockwork behind. What's the best way to finish this gap now? I was thinking of filling it up with foam to provide a backing, then filling as normal, but not sure if there is a better way.
![DSC_1603.JPG DSC_1603.JPG](https://cdn.diynot.com/data/attachments/254/254811-dd964c0b8fd6e5f20dd6e58002ce8393.jpg)
There's about an inch gap through the gap to the blockwork behind. What's the best way to finish this gap now? I was thinking of filling it up with foam to provide a backing, then filling as normal, but not sure if there is a better way.
![DSC_1604.JPG DSC_1604.JPG](https://cdn.diynot.com/data/attachments/254/254810-625d31c8c3036be9b5c266574b740c8e.jpg)
![DSC_1603.JPG DSC_1603.JPG](https://cdn.diynot.com/data/attachments/254/254811-dd964c0b8fd6e5f20dd6e58002ce8393.jpg)