There are several ways in which to repair lath and plaster - using modern or traditional techniques, or by learning how to patch plaster. If, on the other hand, large chunks of your wall or ceiling are coming away, more significant repair work will be necessary. Simply check them regularly and keep an eye on any new cracks that appear - often simply skimming over them with a suitable, lime-based, plaster mix is sufficient. Of course, if your walls are still in good condition, there is no need to touch them. If you live in a house with lath and plaster walls (likely if your house was built before 1940) then you might be wondering how to repair damaged lath and plaster. You can insulate your existing lath and plaster walls by using blown-in cellulose insulation, which eliminates the need for removing plaster from the walls. How do you Repair Lath and Plaster Walls? This approach would leave the exterior of the building untouched. I understand the concern with condensation and moisture, he says, and I want to make sure I am planning and executing this job correctly. a 3/8' thick layer of rock lath or gypsum board lath. These mixtures usually used a 1:1:6 combination of gypsum or cement, lime putty and sharp sand for the initial two coats, then equal parts of lime putty and gypsum for the final layer. AJL plans to remove the interior plaster, and possibly the lath, then frame 2×4 walls, rewire, insulate, and install drywall. So from the top down and starting at zero on your tape, we have. Later on, it became common to add in gypsum or sometimes cement - this was to speed up the setting process between each layer. The third layer was commonly made up of lime putty and a fine sand in a 3:1 mixture - or sometimes just lime putty. The first two layers of plaster that were applied to the lath were usually made up of lime putty and sharp sand in a 1:3 ratio - often with animal hair added in to help bind them. The next step is to go inside and install fiberglass, batting insulation between the 2 x 4 or 6 studs. When a new house is going up, they frame the sidewalls and install exterior sheathing. You can also fill from the attic if you cant get it all from the 1st. A lot of times the walls are also missing blocking in the attic, you want to get these also sealed up as well. (Image credit: Getty) What Type of Plaster Was Used For Lath and Plaster? Most building codes today require that when a new house or addition is built in a northern climate, it must have a vapor barrier. If your 1st walls are open, the easiest is to put in the fire blocking for the 2nd floor, drill 2' hole in it and blow in the insulation. Lath and plaster walls were commonplace in house right up until the advent of plasterboard in the 1930s.
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