ᐅ Should the exterior window reveal be plastered when using compressible foam tape?

Hello everyone,

Since the exterior wall of the existing property is not perfectly vertical, there is a gap of 5mm (0.2 inches) at the bottom between the terrace door and the wall, and nearly 1.5cm (0.6 inches) at the top edge. It is sealed with compressed sealing tape.

Do you have any suggestions on how I can plaster the exterior reveal so that it remains vapor-permeable on the outside?

Lime-cement plaster is generally purely mineral-based and vapor-permeable, making it ideal for plastering your window reveals.

Attach the plaster stop bead with sealing tape and then apply lime-cement plaster.

Yes, that is the most effective way. This also allows you to straighten the sloped wall.