I am renovating, and the old plaster is falling off the wall. The wall itself is made of brick, but unfortunately not so attractive (otherwise my problem would have a solution).
I have realized that I need to remove the old plaster and replace it with something else. I am considering one of the following three options, but I'm open to suggestions:
Gypsum plaster:
This seems fairly easy for a beginner to apply, and it has a short drying time and good adhesion. Naturally, the corners need reinforcing, and it's not very water-resistant, but how is the durability and what happens if you spill, for example, juice on it?
Lime mortar:
Harder to apply and longer drying time. But on the other hand, it's durable and water-resistant.
Menerit board:
Some kind of board material that I either paint with texture changes or apply some other texture to.
Someone with experience is welcome to point me in the right direction.
I have realized that I need to remove the old plaster and replace it with something else. I am considering one of the following three options, but I'm open to suggestions:
Gypsum plaster:
This seems fairly easy for a beginner to apply, and it has a short drying time and good adhesion. Naturally, the corners need reinforcing, and it's not very water-resistant, but how is the durability and what happens if you spill, for example, juice on it?
Lime mortar:
Harder to apply and longer drying time. But on the other hand, it's durable and water-resistant.
Menerit board:
Some kind of board material that I either paint with texture changes or apply some other texture to.
Someone with experience is welcome to point me in the right direction.
Hydraulic lime mortar an alternative?
Lime mortar, or c-mortar, also works with hudraliskt. But it's more expensive and sees no benefit.
hsd
Member
· Kalmar län, Östra Götaland
· 7 154 posts
hsd
Member
- Kalmar län, Östra Götaland
- 7,154 posts
In 2005, I refinished a chimney with cement mortar and painted it with regular paint a month later, and it still looks like new.
Best answer
You're thinking of A-mortar.D Dissonans said:
It has as much cement as concrete, but sand instead of gravel.
Doesn't handle movement at all, and cracks instead.
Mainly used on foundations, etc.
Lime mortar is E-mortar, hydraulic lime mortar comes in different options depending on the amount of binding agent.
Lime mortar is probably the best when you have brick.
But I think you should go with C-mortar 3mm, that way you can apply more without shrinkage cracks.
A-mortar is the mortar with the most cement (no lime) in it and E-mortar is the weakest, with no cement at all, just lime.
C-mortar is the most common mortar, used on walls indoors and outdoors, with both lime and cement.
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To complicate things a bit more, there is a certain percentage of limestone flour even in the regular cement-based plasters in bags (the one called A-C). The limestone flour makes the mortar stickier/thicker and the portland cement sets better, making it easier to work with.
If you mix mortar using only portland cement (=building cement. NOT the product masonry cement) and sand, you get pure cement mortar. A bit of a hassle to work with and make it look nice (runny), but it holds up well in frost-prone outdoor locations, such as if you are going to build an outdoor grill or gateposts.
If you mix slaked lime into the pure cement mortar, you get lime-cement mortar. Pleasant to work with.
If you mix mortar using only portland cement (=building cement. NOT the product masonry cement) and sand, you get pure cement mortar. A bit of a hassle to work with and make it look nice (runny), but it holds up well in frost-prone outdoor locations, such as if you are going to build an outdoor grill or gateposts.
If you mix slaked lime into the pure cement mortar, you get lime-cement mortar. Pleasant to work with.