Large gap above window


New Member
I've knocked off a load of plaster around a window to reveal a large gap between the window frame and lintel.

This gap was originally covered with a thin piece of wood tacked to the lintel above, then plastered over - god knows how the plaster stayed up so long as it was very flimsy!

I was thinking of filling with expanding foam, then covering it with a more secure cover, meshing it then plastering over, although it feels like a large area to fill with expanding foam!

Any other suggestions? See pic


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