I need help in choosing the type of concrete/mortar to repair the inside of my basement walls.
The house was built in 1926 and the foundation wall consists of tamped or poured concrete, with large stones mixed in. The house was built and inhabited by one of Malmö's later major construction engineers. On the inside of these walls, there has been a thin layer of mortar it seems, but since the 60s it has been covered with asbestos boards and plasterboards. As I am now removing this, more than just the plaster is coming off, and I'm also left with indentations in the wall that need to be filled.
I plan to paint the walls with silicate paint and/or cover them with tiles. It will vary between different rooms in the basement. I'm aiming to restore the natural moisture movement/drying that the basement originally had. The basement is kept heated to around 18 degrees when it's not summer. Sometimes you can see a little moisture coming in at the slab during heavy rain. However, this has almost completely stopped since I modified the drainage from the heat pump so it no longer ran into the ground outside.
The house hasn't been drained since the late 60s, if at all. At least new concrete pipes were laid down for downspouts and stormwater wells, and these seem to serve their function. I also do not have any major plans for drainage unless it turns out to be really necessary. During last year's flood, a few centimeters of water came into one of the rooms where there isn't a floor drain, and I will likely pour a new drain there later. So the house withstands even extreme amounts of rain quite well.
At the bottom of the wall, there is a layer of rather hard concrete about 15 cm up, which is holding on very well. It has also not been enclosed by the asbestos cement boards and thus has been well ventilated.
I'm thinking of repairing the walls with some type of cement and don't have very high demands on the surface structure. Even if it might be done in stages due to the thickness. Other walls in the basement are brick, and I plan to repair those with lime mortar.
Here is a simple building description of the house, the only one that remains. It specifies what is cement concrete and, above all, distinguishes between cement concrete, lime plaster, and cement. Could it work with plaster mortar B ( http://www.weber.se/fasad-puts-och-...murbruk/weberbase-222-mur-och-putsbruk-b.html ) or should one go up or down in class? Considering the distinction between cement concrete and lime plaster, there shouldn't be much lime in the cement in the outer wall.
Absolutely not stronger than C-bruk. If the walls are very loose, it can also become too strong, but if you are careful to remove everything that is loose, then C-bruk should work. If you want to plaster on a really weak substrate, you should choose D-bruk, i.e., lime mortar. However, it won't work so well to paint with silicate paint then.
What did you choose, and did it work well?
In our house from 1920, the interior walls in the basement look similar. Mixed stones, and it feels like with a little effort, I could knock down all the interior walls before finding any really solid material.
The exterior walls, however, are built with brick, so they seem fine.
Click here to reply
Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.
