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Fixing gap in brick shed

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We have a brick garage where some of the cement(?) on top of the wall has come off, leaving a gap between the top of the wall and the roof. How can I go about replacing this in a way that doesn't look terrible? Just regular cement and try to shape it to match the existing layer? Any better options?
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Is the gutter leaking or overflowing into it?

You could replace that mortar fillet with something like 3:1:1 soft sand, sharp, cement.

Might be worth sticking some felt over that or a strip of zinc flashing.

Was that dpc strip just sat on top?
 
Can you take a photo from higher up, slightly away from the wall but looking along it?
 
Is the gutter leaking or overflowing into it?

You could replace that mortar fillet with something like 3:1:1 soft sand, sharp, cement.

Might be worth sticking some felt over that or a strip of zinc flashing.

Was that dpc strip just sat on top?
Thanks! Don't think the gutters leaking, it seems pretty solid. The dpc strip was under the mortar that's fallen off.
 

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The gutter and the roof are very intimately attached! I hope they are married.

Is that water sitting in the gutter?
You might want to check the outlet are clear (easy) or adjust the fall (hassle)

A trick is to leave a length of rope sitting in the gutter, with the end hanging over the outlet, it will slowly wick away any standing water, but will require regular checking and occasional replacement.

The dpc under the mortar won't be doing much, there's not enough weight on top to hold it down, and it will prevent the mortar from bonding to the brick.

I refer you back to my original advice.
 
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