Mud the other patches and repaired areas with the drywall compound.
Repair lath plaster ceiling step through attic broken lath.
Mix the plaster filler as directed to by the instructions that come with it.
There is even a system available in the states called big wallys plaster magic or you can see an video that explains the principles here gluing lath and plaster.
When the tape and first coat are dry apply a second smoothing coat.
Keep the level of the render well below the surface level of the surrounding plaster to allow space for the floating and setting layers.
Dampen the laths and the surrounding plaster using a wet brush or water spray and then apply a coat of render onto the laths making sure that render goes through between the laths to provide a grip.
First you should be sure to clean the surface from any loose plaster.
Repair lath plaster after stepping through the ceiling kirk giordano plastering inc.
Apply wallboard tape and wallboard compound to all four sides of the patch.
Insert a 1 5 8 inch drywall screw through the center of a plaster washer.
Restoring original plaster how to repair lath and broken plaster duration.
To prepare for applying the filler try to undercut the plasterwork at the edges so that there is a good grip available for the new filler.
A popular way is to drill 4mm holes slightly countersink the holes vacuum then squirt a thin adhesive into the hole followed by the drywall screw.
This will help the compound form a bond and prevent it from falling away later.
Sand down any excess drywall compound and then prime.
Step 1 repairing small or medium sized holes if you have areas that need to be repaired that are smaller than a few inches in size you can fix this with a simple plaster or paris mixture.
Use a drywall compound and a putty knife to spread a thick layer of mud over the screws image 2 after it is dry put on another coat.
Use a spray bottle to lightly moisten the area around the hole.
You will hear this option discussed a lot hence being first in this list.
Snap off the temporary tabs from the repair clips.
A lath and plaster ceiling can be left in place and over boarded with plasterboard using long drywall screws through the existing lath and plaster into the joists not ideal but quite commonly done.