If doing a whole room and the carpet is not removed I will lay down poly sheets and then plywood over that. Once the lath is mixed with the plaster chunks it makes it harder to shovel up and remove. it is nasty, dirty work! I like to remove the plaster as much as I can and clean it up from the floor before removing the lath. We have already decided to remove some of the lath and plaster and replace it with drywall. We recently installed minisplits and did not have any issue. The walls all seem to be in good condition without separation. My two concerns are (a) cracking the plaster and (b) mold. The contractor proposes green fiber blow in cellulose. Wear good masks/respirators, vacuum things down well after words using a shop vac with a fine filter bag, wetting the materials down a little as you demo also keeps some from going air born and having some ventilation going as well.Īs for the actual work. I am helping some friends with a reno on a 100 year old house with lathe and plaster walls. I’d like to take advantage of state rebates to insulate exterior walls behind plaster and lath and stucco. In my opinion doing a job like this on a very non regular basis ( what I mean is you may do only this one job ever) should not cause you much harm, but you still need to take precautions. Many of those plasters used asbestos and it is bad to breath in to your lungs. Some tips are that you should be wearing a good quality well fitting dust mask or even better would be a respirator when removing the plaster and lath. On homes with a vapour barrier placed under the drywall the walls are designed to breath to the exterior and to reduce the amount of warm moist air from inside the home from entering the walls. In colder climates frost will form in cavity spaces ,usually on the back side of the exterior sheathing and air flow helps dry this out when it melts and thaws. Air flow is important when using batt insulation because it helps to keep the wall cavities dry. Then plaster is applied to the lath in thin coats using a trowel. First, the strips of lath are nailed to wall studs or ceiling joists. The only way you could stop it would be to entirely fill the cavity with foam. Lath and plaster walls are wall covered with 1-inch wide strips of wood nailed closely together followed by 3 thin coats of wet plaster. Insulating the walls with a batt type insulation will somewhat reduce the ease of air flow but it will not stop it.
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