The question concerns a concrete house built with cast elements, not ciporex or the like. The facade has maybe 10 cm of concrete on the outside, then Styrofoam, and it is a somewhat deeper layer, perhaps 15 cm.
On the inside, there are plasterboards.
There is a round hole, 80 mm, running through and in a position exposed to rain. This was to be repaired, and I was considering preserving the layers in the wall. The easiest way would be to first place Styrofoam in the middle where it should be and put some indoor plaster on the inside and presumably cement on the outside.
What has happened now is that the entire hole has been filled with cement except for two cm at the very inside against the plasterboard, which has instead been spackled with something for indoor use, which is reasonable.
The question is essentially whether you think it's a problem to place cement in this layer with Styrofoam. The layer's function, of course, is insulation, but it's not the lack of insulation I'm worried about, rather if it can cause any damage.
On the inside, there are plasterboards.
There is a round hole, 80 mm, running through and in a position exposed to rain. This was to be repaired, and I was considering preserving the layers in the wall. The easiest way would be to first place Styrofoam in the middle where it should be and put some indoor plaster on the inside and presumably cement on the outside.
What has happened now is that the entire hole has been filled with cement except for two cm at the very inside against the plasterboard, which has instead been spackled with something for indoor use, which is reasonable.
The question is essentially whether you think it's a problem to place cement in this layer with Styrofoam. The layer's function, of course, is insulation, but it's not the lack of insulation I'm worried about, rather if it can cause any damage.
Construction veteran
· 2 675 posts
If you have cement all the way into spackel, it's not good, the frigolit in the middle doesn't conduct water like concrete or cement.
I suspected that might be the case. You mean that moisture can get into the wall this way?A Argastesnickaren said:
Construction veteran
· 2 675 posts
Exactly, concrete and cement conduct water, check regular concrete slabs, if it rains on them, moisture goes into the stone. The foam insulation in the wall both insulates and interrupts moisture migration in the wall. If the concrete becomes moist and there's no insulation in between, it can still conduct moisture into the filler. Another thing is that without insulation, the concrete can conduct cold all the way in. At a very cold spot on a wall, warm air with high humidity can condense on the cold surface, think of taking a beer out of the fridge on a warm day
What specifically do you mean is not good?G GoGetLost said:Cement is a binding agent in powder form, so if it's present all the way through, it's definitely not good
It's cement. It's a fact. Now I wonder what it is about the fact that you say isn't good.G GoGetLost said:
The plan right now is to drill away half of the cement cord and get 7-8 cm into the foam. Then fill in foam there and then new cement on the outside so that I get some insulation between the cement and the inner wall. On the other side (the inner wall) it's newly painted now so I don't want to drill it all out unless I have to. That would mean the painting would need to be redone as well.A Argastesnickaren said:Exactly, concrete and cement conduct water, look at regular concrete slabs, if it rains on them, the moisture goes into the stone.
The foam in the wall both insulates and breaks the moisture migration in the wall.
If the concrete gets damp and there's no insulation in between, it can still transfer moisture to the putty.
Another thing is that without insulation, the concrete can conduct cold all the way in.
On a very cold point on a wall, warm air with high humidity can then condense against the cold surface, think about taking out a beer from the fridge on a warm day
Someone has said that in theory, it's correct, there is a risk of having cement throughout, but that the risk is small that it will have any practical significance. So I think this is a kind of compromise between doing nothing and drilling up everything and starting over with the painting.
Cement is a binder, a powder. You pour a bag of cement into a mold, what do you think happens with it? Is it something that would be good to have just cement somewhere? No, of course not. You simply make concrete using cement.Skumpe said:
Are you sincere in not understanding the thread's question? I mean no harm, have a lot of experience with people with, for example, autism but also don't want to seem patronizing and over-explain things if you're just trolling.G GoGetLost said:
If you look at my first post, you can probably see that it wasn't addressed to you, so I'm not sure why you actually responded to my first post. The only thing I wanted to explain was that cement is an ingredient in concrete, no one has "just cement" anywhere because that wouldn't work, but you didn't quite want to understand that
So I have never responded to the thread's question.He tried to be a bit funny and hinted that you and many others don't really know what cement is. That is, you confuse cement with cement-based material (e.g. concrete).
He has explained several times that cement is a binding agent, a powder. You don't build walls out of powder. Cement is used as a binding agent along with other ingredients to create a material that you then build things from.
Equating cement with a cement-based product (e.g., concrete) is like equating flour with pancakes. You wouldn't say you're eating flour with jam just because the pancake uses flour as a binding agent. For people who know the difference, it sounds strange every time someone says "the wall is made of cement" or something similar.