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How to fill an internal masonry wall cavity?

Hi all. I’m renovating our ensuite and currently have a wall cavity from a previous recessed shaving cabinet. I want to fill in the cavity as will be installing a flat mirror. The mirror is oval in shape and doesn’t cover all the cavity and I think my preference is to fill the cavity completely and render over the top to match the rest of the walls in the ensuite. Would it be best to remove current wood frame and then brick it out and render over the top? or is there a better solution. Any guidance, advice appreciated.

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MitchellMc

Welcome to the Bunnings Workshop community @Damian08. It's a pleasure to have you join us, and many thanks for your question about filling a masonry wall.

The main issue you’ll face is that the existing timber frame is flush with the wall surface, so it will need to be removed before you can properly fill the cavity. Bricking up the area is a solid and long-lasting solution, especially if you want the repair to be consistent with the rest of the masonry wall. Once the cavity is bricked in, you can render over it to match the existing finish seamlessly.

Alternatively, if you’d like an easier option, you could remove the current frame and replace it with a new timber frame that’s set slightly back from the wall surface. This would allow you to fix a cement sheet over the opening, somewhat recessed from the surrounding wall, and then apply a render finish over the top. This approach avoids the heavier work of bricklaying but still gives you a strong, stable surface for your mirror and a neat final result. Either method will work; it really comes down to whether you want a fully masonry repair or are happy with a framed and sheeted solution.

Please let me know if you have any questions.

Mitchell

Damian08

thanks - will give the cement sheeting a go.

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