Is it necessary to remove existing plaster down to the studs before attaching drywall, or is it possible to simply hang drywall over it?
Asked by Harry Grant 
5 months ago
Last Updated: July 26, 2024
I’ve heard that you can put drywall over existing plaster, but wouldn’t it be better to remove the plaster first and then attach the drywall to the studs and lathing?
That’s really the only way to go about it. I definitely wouldn’t suggest placing sheetrock right over the existing plaster, and there are multiple reasons for that.
💯
Certainly, adding an extra layer may necessitate adjustments to all your trim, casings, outlets, and switches to accommodate the new depth. If you’re using wallboard, there’s no need for the lathe.
Exactly, because if you skip the stripping process, it raises the question of what the drywall will be attached to.
Mentioned the studs. I think we should demo it. It’s a good chance to check for any MEP items in the wall.
Is the one who installed the slats behind the plaster.
Yeah, they’re only a 1/4 inch thick… haha. I’m not sure what your profession is, but I’ve been working as a contractor for 43 years now.
Absolutely, there are many reasons for this, mostly related to outlet and switch boxes, as well as door/window trim, crown molding, etc.
PLUS probable absence of insulation in walls (either not installed or has deteriorated)
It’s definitely the way to go. However, not everyone chooses this route because it involves a significant amount of work and creates a big mess when removing lathe and plaster. Additionally, there’s often blown-in insulation that can fall out, requiring a complete redo of the trim. I have experience with both methods.
That’s the most ideal option, although it can be quite messy. I covered cracked but still flat plaster with 3/8 drywall and it worked really well. I simply created small holes at the top of the wall to find the studs.
Definitely
If you skip this step, you may need to reposition all of your electrical boxes and switch boxes, and you could end up with missing studs when attaching the drywall.
There’s no problem with going over the existing plaster. Just make sure to screw into the studs when hanging drywall. Removing the plaster and lath can lead to additional challenges and a messy situation. Ceiling joists were not perfectly level 100 years ago, so you may need to do a lot of shimming to achieve a flat ceiling due to settling over time.
Make sure to test the plaster for asbestos before you start removing it.
No, actually, plaster itself does not have asbestos. However, there might be some vermiculite insulation behind it that does.
Yup, and even some of the early drywall muds.
https://www.cooneyconway.com/blog/asbestos-in-plaster-walls
Asbestos was commonly added to plaster in the ’70s and ’80s for insulation and fire protection. If you’re planning on removing or disturbing plaster, it’s best to have it tested just to be on the safe side.
I’m always learning something new every day. My entire house was filled with plaster and lathe. I took it all down one room at a time, but I might have unknowingly impacted my health in the process.
I once gutted a plaster and lathe house without knowing the risks. I wore a mask for the dust, not realizing the danger of asbestos at the time. I’ve since warned others to get their homes tested before remodeling – some had it, some didn’t. It’s better to be safe than sorry.
Pointed out that the plaster may contain asbestos.
Sure
When removing plaster from walls, remember to keep the lathe intact as it provides support between the studs and results in a smoother wall. To secure loose electrical boxes, consider using Madison straps. Additionally, keeping the lathe in place helps ensure that door and window frames align with the finished wall.
However, if you don’t remove the lathe, you’ll have to keep the old, sometimes very old, wiring and insufficient insulation. It’s better to strip it all down and replace everything now to avoid paying a higher cost later.
Stripping the plaster has several benefits, as mentioned before. On exterior walls, it also allows for the opportunity to upgrade insulation or inspect the current insulation levels.
And update knob and tube
Absolutely, remove the plaster and lath
Hey man!! Do yourself a favor and tear it ALL DOWN!! OPEN THAT UP! If you’re concerned about the mess, don’t worry because when you plaster it, it’s going to be chaotic anyway! Just section off areas for a ten by ten space!
Thanks to everyone for the suggestions. I’ve decided to completely strip it down to the basics and begin anew. Now I just need to determine if my plaster walls contain asbestos…yay 🙄
If the plaster is on an outer wall, taking it out will give you the opportunity to insulate the wall.
Feel free to take off that plaster. Trust me, you won’t want to do it again. Just cover it up with drywall.
It’s honestly not a huge issue.