Crack in mortar where extension joins house

[BelindaJ]

Please see attched photos of one side of the extension. The other side is exactly the same.
The extension was built 3 years ago and has been fine up until now.
I would appreciate any thoughts on potential cause, and what are the next steps.

 

[^woody^]

It's normal. The joint should be of flexible mastic to deal with such movement, not mortar.

 

[BelindaJ]

Thank you for replying. What is the best way to rectify this, as there is no mortar holding the bricks together. I put a regular knife in to one of the cracks and it goes all the way in, to the depth of a brick. Also water can get in, which is a concern.

 

[Notch7]

Great brick match……

 

[RonnyRaygun]

What is the best way to rectify this?

Rake out the joint and install a compressible strip and finish with polysulphide sealant.

 

[BelindaJ]

Thank you for your advice. Much appreciated.

 

[BelindaJ]

Thank you.