Tiling issue with recessed window and trickle vent

[mossley74]

Hi,

We have a recessed window in the bathroom which has a trickle vent at the top of the recess ( please see attached photo). We will be fitting a tile backer board to the underside of the lintel ( top of recessed window). This then means that when the tiles are fixed they would cover the trickle vent.

Anyone any ideas what we should do here?

 

[foxhole]

Doesnt need tile backer board.

 

[mossley74]

Yes, but whatever the substrate plasterboard or else, the issue is tiles will cover the tricklevent, what is usual way to deal with this issue

 

[dontbelieveawordofit]

foxhole means tile straight to the lintel.

 

[tel765]

OP,
is it your intention to replace the green p/board with BB? or fix BB over the green p/board?

If you removed the recently fixed green p/board, and were left with a half decent window head surface then you could tile directly up to the head?
Even a rough surface can be made presentable by combing the surface & buttering the tile with adhesive.

Fwiw: once satisfied i would then mitre and set my edge beads before any tiling.