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Cement board ceiling repair.
The concrete or support structure are beginning to fail.
Ordinary cement won t work because as it dries it shrinks.
How to replace lath plaster with cement board.
The soil can set causing the foundation to shift and concrete ceiling crack repair becomes necessary.
Replacing lathe and plaster in your older home s bathroom is a time consuming and messy job but the results can be worth it.
The repair compound will have pushed up a little so you ll need a coarse grade sandpaper designed for metal or concrete to smooth the surface for painting or sealing.
It is made of cement water silica limestone flour and fibers such as kevlar or fiberglass for increased strength.
By replacing plaster.
Cement backer board is a mineral based pre fabricated wall unit usually 1 4 inch or 1 2 inch thick and 3 feet by 5 feet long.
New materials are durable strong expand as they dry and create a permanent repair.
If the repair is inside a finished space recoat or paint the ceiling where the repair was done.