Plaster by stove. Previously plastered with lime mortar and something cement-based

[Kreacon]

Hello
I need to touch up around the fireplace. The plaster application will be about 20 mm.
I believe the chimney was originally plastered with a lime mortar. (The house is from the 1800s). Later, it was plastered over with a cement-based mortar. It's a very thin layer with the cement-based mortar.
Now that I'm going to plaster again, can I use C-mortar? It might be better to use KC or pure lime mortar, but I have C-mortar at home.

What do you think?

Best regards, Kristoffer

 

[cpalm]

Oh dear, it looks like you have a through crack that should be reviewed. Or what happened here?

 

[Kreacon]

Oops, it looks like you have a continuous crack that should be reviewed. Or what happened here?

It is a superficial crack in the outer layer of plaster.

 

[cpalm]

It is a superficial crack in the outer layer with plaster.

Wondering where all the soot is coming from? Or is it something else black?

 

[Kreacon]

Wondering where all the soot is coming from? Or is it something else black?

It's probably that the water I've used has soaked in more there. It looks like a superficial crack anyway, and it's been there as long as I've had the house (10 years) and the chimney sweep has never said anything.

 

[neo11]

Run the scrub brush or high-pressure washer properly.
Otherwise, nothing works. Use c bruk if you have it.
Kalkbruk works just as well.

 

[Kreacon]

Use the scrubbing brush or pressure washer thoroughly.
Otherwise, nothing works. Use c cement if you have it.
Lime cement works just as well

Thanks for the tips. Primed and applied a net.
Hope it suffices.

 

[neo11]

So it is already netted, plastered, and finished?
Would love to see a picture.

 

[Kreacon]

So it's already netted, plastered, and finished?
Would love to see a picture.

Poor lighting.
I had planned to extend the plastered section 10 mm from the rest of the wall but lost the motivation somewhere along the way. 😆

 

[Kreacon]

So it is already netted, plastered, and finished?
Would love to see a picture.

Is it good to hang plastic against it to keep the moisture in?
I plan to water it daily for five days from what I've read.

 

[neo11]

Looks good, but quite dark mortar.
What kind of mortar have you used for plastering?

 

[Kreacon]

Looks good, but it's quite dark mortar.
What type of mortar did you use for plastering?

Finished plastering tonight, so that's probably why it looks dark. It's c-mortar. What do you think about the plastic?

 

[neo11]

Plastic is used on concrete when it has been cast.
But if it is c compound with lime in it, then you should water it afterwards a bit. Preferably with a larger plant spray, since it is indoors. Do you have the technical name of your c compound?

 

[Kreacon]

You put plastic on concrete when it's been poured.
But if it's c mortar with lime in it, you should water it a bit afterward. Preferably with a larger plant sprayer, as it is indoors. Do you have the technical name for your c mortar?

Okay! Should I water it today then?
This is the mortar. https://www.jemfix.se/putsbruk-c-ha...MIgZvgo9i_jgMVxxiiAx2RlysPEAQYASABEgKdtPD_BwE

 

[neo11]

A few days late, but it's good to keep it moist for a few days. Haven't used that mortar, but it seems okay.