Diamond blades are not meant to cut wood.dry oak lath is still tough and will smolder almost immediately from the friction of a diamond blade. Diamond blade is out.unless you want to run the risk of producing live embers and set the house on fire. Reciprocating blades are brutal on old plaster. Why make two messes and do the job twice? Salvege the plaster only to replace it later? Just plan on one big messy job and tear the old ceiling out.locate the fan where it is needed and do a proper framing job while you have access to the whole ceiling.Ĭircular saw not a good idea.that's one tool I do not like to invert for use.and the dust falls back into saw and can cause the guard to hang up. Would it be a good idea to use that on the plaster/lathe? I may be picking up a diamond blade to do some concrete cutting. I am thinking of using my cordless circular saw and a cheap blade to cut the square in the plaster and lathe. Eventually the hallway will be redone and the plaster will be replaced with fire-code drywall. The last thing I need right now is a sagging plaster ceiling. I know how easy it is to break the tongues off of the plaster that hold it to the lathe. For larger jobs, where I needed to open up a section, I have had success with using a circular saw. I have, in the past, used a drill and kehole saw for small openings in walls (i.e. I need to cut an approximately 24" square opening in the ceiling without damaging the surrounding plaster. The house has it's original horsehair plaster ceiling and walls. The job is a relatively simple one, except for the plaster problem. I am getting ready to install a whole house fan in the upstairs hallway/attic.
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