I'm renovating a room in the basement, and have found a layer of something that looks like straw mixed with mortar. It seems like the entire ceiling has a thin layer of it as well as about a decimeter down on the wall. My thought is, can you scrape it off and replace it with something else that's easier to work with. As I said, why was it put there, what function does it have?
As far as I know, it's the reinforcement in the concrete! In the past, they reinforced with straw. So, it's what holds the entire ceiling together, or the floor above for that matter. Don't remove more!
Okay yes I suspected some type of insulation as it only looks to be a few cm thick in the ceiling. Does anyone have any tips on what to put there instead if we scrape it off the ceiling? The concrete looks to have a very rough surface and we want as smooth a ceiling as possible. The ceiling height is only about 2m so it would be a bit low with a suspended ceiling I think.
The board consists of wood wool bound together with cement. The board was placed directly in the form, then the steel reinforcement, not straw, and the concrete slab was cast. The wood wool board is thus cast into the concrete, hence the uneven surface. The method was used at least up until the 1970s (maybe later?).
The easiest way to get a smooth surface is probably to plaster the ceiling. An alternative is to install ceiling panels.
TS also asked about the function. It is fire-resistant, has a certain sound-dampening effect, and was also considered to counteract condensation. Often, the wood wool was untreated in the ceiling. The plaster may have been added later.
okay yes I suspected some kind of insulation as it only looks a few cm thick on the ceiling. Anyone have any tips on what to put there instead if we scrape it off the ceiling, the concrete looks to have a very rough surface and we want the ceiling to be as smooth as possible. The ceiling height is only about 2m so it gets a bit low with a false ceiling I think
Plasterboard directly on the ceiling maybe a solution?
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