Throughout the 20th century, lath and plaster, among other building products, frequently used asbestos as a fire-resistant and insulating substance. The existence of asbestos in plaster and lath, however, has raised significant concerns. It was especially popular in the late 19th and early 20th centuries, and remained a common building material until the mid-20th century. Lath and plaster were used for both interior and exterior walls and ceilings in homes, commercial buildings, and other structures. The plaster dries and hardens, creating a durable and fire-resistant surface. It consists of a framework made of thin strips of wood or metal called lath, which is covered in a layer of wet plaster. Lath and plaster is a building material that was widely used in construction before the advent of drywall. It’s still a face-full, but it works well.11.3 What should I do if I think my building has asbestos-containing lath and plaster? Introduction to Lath and Plaster Hopefully, this idea might give you a new approach if you’re faced with the task of opening up a plaster wall or ceiling. I’ve used this technique again, while opening large holes for a Solar Tube and a bathroom vent. I was easily able to create a finished edge using standard drywall corner bead. It wasn’t smooth, but it was consistent and there was no additional damage to the surrounding plaster. It went surprisingly fast and I ended up with a pretty decent line. After I perforated the ceiling, I used the grout cutting blade on my oscillating saw to connect the dots. The extra length on the drill bit meant I didn’t to use a ladder. Then, following the line a punch a series of holes about a 3/4 of an inch apart. So, my solution was to mark my line for my opening. (most of my cement drill bits look like they been abused, which they probably have been) Of course, a new cement drill bit can punch through the plaster in a blink. It stood out since it was unusually long and it was unusually new. Perusing the mess on on mess work bench, I came across a new 3/8th inch concrete bit that was about 20″ long. At that rate, I wasn’t sure I’d live long enough to finish the job. It was slow and trying force that blade into a full-coat plaster surface wasn’t exactly ideal. I also have an old Rockwell SonicCrafter oscillating saw. A chisel would be slow and make a mess of the hole. I couldn’t think of any hand saws that would stand up to what’s basically a cement ceiling. Plus, using a circular saw upside down to cut the hole in the ceiling didn’t sound like a ton of fun, either. I imagine that would get the job done, but the dust would be incredible. My first inclination was to use a concrete blade on a circular saw. I was thinking about the various tools (that I own) that might get the job done. When I wanted to add a skylight in the kitchen ceiling, I was faced with the daunting task of cutting a 4’x4′ hole in my kitchen ceiling. At least, it makes the job more interesting, if you don’t mind catching the house on fire. I also tried a variety of bits on my Roto Zip. It worked, but the (pricey) hole cutter was trash, by the time I finished the hole. The first time I wanted to mount a recessed lighting can, I tried a hole cutter on a drill. Trying to cut holes in this stuff can be tricky. The alternative might be plaster over wood lath or metal lath. If you haven’t run into rock lath, it’s essentially drywall, but with a bunch of holes, which hold the plaster in place. The walls in my home are plaster over plasterboard or rock lath. Like most older homes, the walls are plaster. I often find myself working on older homes.
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