Karl: Thank you for contacting Porch. As long as there is no underlying structural issue causing the crack it might be just relate to improper original installation, age and or impact. The loose material will need to be removed, any damage to lath repaired and new plaster installed to match the texture as close as possible. Possibly a handyman can assist, or if more complex a plaster contractor. You can input your zip code at the URL here:
https://porch.com/near-me/handyman or you can call us 1-855-707-0141 to get started locating a local professional. ...
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