Cavity tray over bay window

We have recently had a bay window installed from a flat window our house is 9”solid brickwork since then it has rained in terrible they said it isn’t their problem we need a cavity wall tray why didn’t it rain in before the new bay window was installed then and can we put a cavity tray in a 9inch solid wall with no cavity? Over this bay window?

Asked by Lindy on 26th Feb 2026
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