Leak above glass block exterior window

Joined
21 Feb 2011
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Location
London
Country
United Kingdom
Dear All,

I have a glass block window on the exterior of my building and have noticed that with all the recent wet weather, there is moisture leaking through just above the glass blocks.

I took this short video of the problem with my phone:
www.66georgerow.co.uk/repointing.m4v (8Mb)

About 20 seconds into the video, you can see there is a cavity tray followed by a single layer of brickwork beneath, followed by the glass blocks.

I had planned to hire a cherry picker and rake out then repoint the mortar around that single layer of brickwork. What I'm wondering though is - would applying mortar around these joints cause a problem for the cavity tray? I don't really want the expense, but would I be better off replacing the cavity tray?

Thank you in advance for any insight.

Regards

James.

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