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lath and plaster over wool insulation- all new

 
Maggie Quinn
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I am wondering if anyone out there has built new lath and plaster walls? I have a wall framed and wool batts installed, the issue is I know the plaster will touch the insulation and that seems like it would be a bad thing. Let me know if anyone has run into this, thanks!

-Maggie
IMG_4513.jpg
wall framed and wool insulation batts installed
 
John C Daley
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I dont thinl plaster touching the insulation will be a problem, because the work of insulating takes place within the wool itself.
Lathe and plaster seems over the top when sheets are available now?

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Hey Maggie.
I don’t think that lime plaster touching the wool (mineral wool or what type is it?) should be a problem either.
And also I think you could have an easier (and cheaper) solution by attaching (split) bamboo rolls or willow rolls (the ones used for shade etc) to the studs. We usually space them 20-30” apart and then plaster over them. First layer of plaster quite liquid in consistency so it penetrates between the bamboo or willow.
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William Bronson
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That wall construction looks rock solid!

I've used the drywall joint compound that comes as a powder to repair 100 year old plaster and lathe walls.
It works great, even over multiple layers, almost an inch deep.
What are you using for plaster?

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Maggie Quinn
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Thanks everyone for replying. I know it does seem overkill haha I’m mostly doing it to have my hand at plastering. We’re going to use traditional lime plaster, 3 coats is what I’m told. My concern was that it wouldn’t form a proper “key” to the lath. I was thinking of possibly stapling the wool (sheep’s) to hold it down a little bit to possibly leave some extra room for the key. I’ll let you know how that goes!

-Maggie
 
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John C Daley wrote:I dont think plaster touching the insulation will be a problem, because the work of insulating takes place within the wool itself.
Lathe and plaster seems over the top when sheets are available now?

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Are you going to install laths on the studs first?
 
Benjamin Dinkel
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Maggie Quinn wrote:My concern was that it wouldn’t form a proper “key” to the lath. I was thinking of possibly stapling the wool (sheep’s) to hold it down a little bit to possibly leave some extra room for the key



I would't compress the insulation. It needs to be fluffly to do it's job.
When you apply the first layer of plaster make sure your plaster penetrates. That is make it somewhat more liquid and actually use pressure while applying.

Did you already install all the lath?
Did you look up what distance the lath usually was installed at?

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Maggie Quinn wrote:Thanks everyone for replying. I know it does seem overkill haha I’m mostly doing it to have my hand at plastering. We’re going to use traditional lime plaster, 3 coats is what I’m told. My concern was that it wouldn’t form a proper “key” to the lath. I was thinking of possibly stapling the wool (sheep’s) to hold it down a little bit to possibly leave some extra room for the key. I’ll let you know how that goes!

-Maggie



I did lathe and lime plaster recently and got away with just two coats. My first coat was about half an inch thick I found the lathe created a really good key. I scratched up the first coat to create a key for the second (and final coat) which was about a 1/4" thick. The finish isn't super flat but neither is the plaster in the rest of our house. Here is the video of the project.

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Maggie Quinn
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Benjamin Dinkel wrote:

Maggie Quinn wrote:My concern was that it wouldn’t form a proper “key” to the lath. I was thinking of possibly stapling the wool (sheep’s) to hold it down a little bit to possibly leave some extra room for the key



I would't compress the insulation. It needs to be fluffly to do it's job.
When you apply the first layer of plaster make sure your plaster penetrates. That is make it somewhat more liquid and actually use pressure while applying.

Did you already install all the lath?
Did you look up what distance the lath usually was installed at?




I read that it should be 1/4-3/8” apart. Perhaps I’ll shoot for the wider gap and it will provide more space for a key. The insulation is pretty much right against the lath and is quite firm so I am concerned the plaster won’t have the space to push through.
 
Maggie Quinn
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Cristobal Cristo wrote:Are you going to install laths on the studs first?



Like a shim long ways on the stud? Or you mean ahead of the insulation?
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