External gap between old brick work and new render on corner

[Matt Thomas]

Hi, I have recently had a rear extension with a render finish, however I have been left with a fairly large gap on the corner where the new render and old brickwork meet (photo attached). The builder has said "that's the finish, cause if you fill it with render, it will simply fall out" however I'm not convinced, as this gap is on a corner at the start of a passage and the wind will surely push the rain into the gap and cause dampness. Any ideas on how to fill this gap would be greatly received.

 

[stevethespreader]

Can we see a bigger picture?

 

[Matt Thomas]

Hi Steve, if u click on the photo it should appear larger.... I think

 

[stevethespreader]

Yes it expands but I would like to see a bigger picture of the wall so to speak I want to see more of the wall and diff angle, one things for sure that's not a finish I would like to see more of job to see how best it should have been done and for best remedy