Bonding gutters

5 Oct 2004
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United Kingdom
I've just had a new roof installed for a mid terrace house. The neighbour has advised of an issue with the bonding gutter where he says some cement should be filled on the edge of tiles as the cavity is detrimental for wind and birds.

The neighbour on the other side has a newish roof too and does have cement underneath the edge of his tiles (please refer to second pic).

My roofer advises that they are dry bonding gutters and are meant to be left uncemented so the water can run off.

I am wondering if someone can please check the pictures advise?


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Type dry bonding gutter into Google and tell me if it's the same as what you have
Type dry bonding gutter into Google and tell me if it's the same as what you have
This is what I see:
Last edited:
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Thanks Celeronmanuk, I guess this is the key:
A mortar bed is applied to the sanded strip. The
slates or tiles are fixed on both sides, ensuring
they are located and butted up centrally over the
bonding gutter. Ensure the mortar does not enter
the water channel of the slate or tile.
I have the exact same issue and my roofer said some people mortar them some don’t, knew it was bullshit. Great so I have a draughty roof or have the tiles taken off and put back down again.

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