How to close cavity when using lintels above sewer?

tomfe said:
Cavity batt sits on wall ties, are you sure you're just not inventing a problem.
Click to expand...

Possibly, hence I came on here to ask! I'm not worried about the cavity insulation falling out, more about stuff over time working it's way in. If it got full of soil then damp could penetrate from the outside skin to the inner
 

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