Wholemeal Sough Dough Crust lifting

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Hi - looking for some help. 

On checking this loaf after 15 mins I notice that the top crust is splitting away from the sides.

Can anybody help as to why and what I might do to stop this happening.

I like the end look but would be keen to have some input.

 

With thanks

You mean 15 minutes into baking? 

This is probably related to shaping and dough strength. You probably didn't slash your crust, did you? Expanding dough will take the path of least resistance (weakest point), and in your case it's the edge of the crust. 

Underproofing can cause blow-outs as well.