Gap between render & brickwork

[wickedwjc]

Hi all,

I have a gap between render and brickwork (approx 17.5mm at widest point) - see photo. I'm wondering if this should be filled with mortar or whether it's better to use something more flexible?

Any thoughts? Thanks

IMG_20190419_141516.jpg (664.46 KiB) Viewed 1306 times

[rooster4321]

Looks like an expansion joint should probably use some kind of caulk like np-1

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