Hi
Going to plaster a leca wall, does anyone have experience with plastering leca and knows the long-term result?
Do we need mesh or can it be plastered without it?
Should one use fiber-reinforced plaster or can it be done without?
That plaster adheres to Leca and finds its way between all the grains, etc., is not up for discussion, but when it comes to cracking, it matters whether you have mesh or not, especially on a leca wall.
Our wall stood unplastered over the winter, and already last fall a crack appeared, but no more have formed.
There are divided opinions on how to proceed, so objective and experienced insight on the matter is desired...
Cheers!
Going to plaster a leca wall, does anyone have experience with plastering leca and knows the long-term result?
Do we need mesh or can it be plastered without it?
Should one use fiber-reinforced plaster or can it be done without?
That plaster adheres to Leca and finds its way between all the grains, etc., is not up for discussion, but when it comes to cracking, it matters whether you have mesh or not, especially on a leca wall.
Our wall stood unplastered over the winter, and already last fall a crack appeared, but no more have formed.
There are divided opinions on how to proceed, so objective and experienced insight on the matter is desired...
Cheers!
It is perfectly fine to plaster Leca without reinforcement. Reinforcement is required when the surface is uneven so that the plaster layer becomes thick, like on a limestone wall. I use regular cement plaster, i.e., cement, sand, and a bit of lime.
If the wall moves, the plaster will crack; otherwise, it won't. If you have a crack in the wall, it is likely to continue moving there, and the plaster will crack as well. Not necessarily making the crack larger, but enough to cause a crack in the plaster.
If the wall moves, the plaster will crack; otherwise, it won't. If you have a crack in the wall, it is likely to continue moving there, and the plaster will crack as well. Not necessarily making the crack larger, but enough to cause a crack in the plaster.
Well, I don't agree with the previous. Since you already have movement in the wall, a hard plaster will crack more and this can't be fixed with meshing. If you use mesh, there is a high risk that instead of getting a crack, a chunk of plaster will fall off. The movement is there and it can't be prevented with plaster. A hard plaster does not allow for movement and will crack. If you have mesh, it will pull off a larger chunk instead of just a crack. You want a plaster that is a bit softer, hence the lime.
However, advice on brick on the top is good.
However, advice on brick on the top is good.
The net makes it impossible for large sections of plaster to come loose as it reinforces the plaster, a correctly placed net is positioned in the middle of the plaster. The crack could just as well be frost spalling due to the wall being unplastered during the winter.
The Leca wall stands on a cast concrete plinth that is reinforced. The Leca blocks start approximately 40 - 50 cm from the ground.
if the crack is active, the reinforcement mesh doesn't help that much.
when we repair cracks, we use special concrete with fibers, and the thickness is at least 1.5 cm. then you have to seal everything with a sealer. and paint (before sealing)
Sent from my GT-I9100 using Byggahus
when we repair cracks, we use special concrete with fibers, and the thickness is at least 1.5 cm. then you have to seal everything with a sealer. and paint (before sealing)
Sent from my GT-I9100 using Byggahus