This video shows the cavity tray was never inspected, and cleared of debris before the cavity wall insulation was installed. The bitumen cavity tray has also broken down, and needs to be replaced. Unfortunately this is a common issue that I come across now. When purchasing a property please consider a proper survey to evaluate defective cavity wall insulation installs, and see if the property is guaranteed, and if the guarantee is actually valid. I often find if there is the smallest of pointing issues on the opposite side of the building internally the guarantee isn't valid.... you may need to budget for extraction, and possible replacement wall ties.
Costs can spiral where scaffolding is needed, cavity wall insulation removal, wall tie replacement, repointing, and ventilation.
Click on my other videos that show other issues of cavity wall insulation where the sub floor ventilation is blocked and rot occurs in the suspended timber floors. All of this work is very expensive to repair, so make sure you instruct a surveyor.
Any questions put them in the comments below, and I'll answer them for you.

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