Exposed Laths in Porch ceilng help sought.

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We have just removed our rotting 1970s wooden porch frame from front of 1918-built semi. Mostly good; however, now small gap in ceiling and lathes exposed. This was previously “inside” as inside porch. Obviously patched in recent decades with gypsum-based plaster as repair now evident.

Question is: patch with mortar? Lime-based plaster?

We will not be replacing porch, but keeping as originally built.

Any help gratefully received.
 

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I can't make out the scale of your pic, but you can patch the plaster with either lime or gypsum. I've had a lime ornate ceiling in an open porch and it seemed to withstand the weather well for over a hundred years. You might like to screw some modern Expanded Metal Lathing to the structural timbers because the old laths may be perished or rotted, and the old nails rusted.

Don't hammer in nails as it may all fall down.

If you have access to the upper surface I can explain how go repair cracks and sags.
 
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Many thanks JohnD and foxhole. It’s not a large hole. Barely 6” by 1.5”/2” at a rough estimate.
 

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