![Repair this drywall: What are these boards? They have mortar or plaster in them. Also my repair board is 1/16” thicker & would protrude so I think I'm going about this all Repair this drywall: What are these boards? They have mortar or plaster in them. Also my repair board is 1/16” thicker & would protrude so I think I'm going about this all](https://i.redd.it/repair-this-drywall-what-are-these-boards-they-have-mortar-v0-k1wnvepa7zw91.jpg?width=4032&format=pjpg&auto=webp&s=335f3d1c2daa8a5478ae4875a2b0c786d07615b7)
Repair this drywall: What are these boards? They have mortar or plaster in them. Also my repair board is 1/16” thicker & would protrude so I think I'm going about this all
![Cut hole for light switch into lath & plaster. How to stabilize loose lath? - Home Improvement Stack Exchange Cut hole for light switch into lath & plaster. How to stabilize loose lath? - Home Improvement Stack Exchange](https://i.stack.imgur.com/OxLwK.jpg)
Cut hole for light switch into lath & plaster. How to stabilize loose lath? - Home Improvement Stack Exchange
![What is the best way to fix broken OLD plaster in a very old house? - Home Improvement Stack Exchange What is the best way to fix broken OLD plaster in a very old house? - Home Improvement Stack Exchange](https://i.stack.imgur.com/Nt4Z0.jpg)