ᐅ Concrete slab without a screed layer on the upper floor/attic – what to do?
Created on: 21 Feb 2022 23:31
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christophen
Hello everyone,
In our house (new build, precast concrete), there is only screed on the ground floor. What is the best way to prepare the subfloor for the parquet?
Most neighbors are applying mainly a primer plus leveling compound. Then they use some kind of underlayment for impact sound insulation and install vinyl flooring. So, most are having a floating floor installed.
However, some parquet installers had concerns and were unsure how this would work without screed. They said that without screed, it might not be feasible due to sound insulation and residual moisture in the precast concrete elements.
As far as I understand, the height from the floor to the door lintel is not sufficient for screed either. Maybe the doors would need to be shortened.
How would you proceed? Would you still have screed installed (despite the high costs and the effort with the doors)? Or is a leveling compound enough?
We would like to install parquet everywhere. Do we need to consider anything specific if we don’t have screed underneath?
Thanks in advance for your help!
In our house (new build, precast concrete), there is only screed on the ground floor. What is the best way to prepare the subfloor for the parquet?
Most neighbors are applying mainly a primer plus leveling compound. Then they use some kind of underlayment for impact sound insulation and install vinyl flooring. So, most are having a floating floor installed.
However, some parquet installers had concerns and were unsure how this would work without screed. They said that without screed, it might not be feasible due to sound insulation and residual moisture in the precast concrete elements.
As far as I understand, the height from the floor to the door lintel is not sufficient for screed either. Maybe the doors would need to be shortened.
How would you proceed? Would you still have screed installed (despite the high costs and the effort with the doors)? Or is a leveling compound enough?
We would like to install parquet everywhere. Do we need to consider anything specific if we don’t have screed underneath?
Thanks in advance for your help!
I have also laid parquet flooring partially over concrete floors. First, I treated the surface with a primer, then applied a leveling compound about 2–5mm (0.08–0.2 inches) thick. For impact sound insulation, I used a 5mm (0.2 inches) composite foam. Then, I installed floating click-lock parquet on top.
I have had it for 10 years without any issues. It still looks great.
This parquet includes the typical creaking sound, which I really like.
I have had it for 10 years without any issues. It still looks great.
This parquet includes the typical creaking sound, which I really like.
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christophen25 Feb 2022 20:54Durran schrieb:
I have also installed parquet flooring over concrete slabs in some areas. First, I applied a primer to the surface, then a leveling compound about 2–5 mm (0.08–0.2 inches) thick on top. For impact sound insulation, I used a 5 mm (0.2 inches) bonded foam underlay. Then I installed click-lock parquet as a floating floor.
I’ve had it like that for 10 years without any problems. It still looks great.
That typical parquet creaking is included—I really like it. Okay, thanks. We will probably go the same way. The other method just sounds too stressful somehow...
I hope it’s also possible to use an adhesive over the leveling compound and glue the floor down 🙄.
christophen schrieb:
I see.. is it possible to put something under the steps so that all (really all) steps are a bit higher.. We wanted to close the opening under the stairs anyway..If you place a spacer under all the steps, you will have an issue with the first step on the ground floor because its height is different from the others. A staircase is designed based on the measurement from the top surface of the finished floor on the ground floor to the top surface of the finished floor on the upper floor, and the rise is evenly distributed across all steps.
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christophen25 Feb 2022 21:38hanse987 schrieb:
If you place a spacer under every step, you will have a problem with the first step on the ground floor because it has a different height than the others. A staircase is calculated starting from the top surface of the finished floor on the ground floor to the top surface of the finished floor on the upper floor, and the rise per step is divided evenly. Okay, thanks. We will probably proceed as @Durran suggested, that is:
Priming + leveling compound + parquet.
Whether we can glue the parquet with this method is still a question 🙄 but probably yes.
The neighbor’s flooring installer measured the residual moisture during priming and used a different primer for the upper and attic floors than the one used on the ground floor.
hanse987 schrieb:
I wouldn’t base the whole decision solely on the door height, but also on the staircase. What is the maximum floor buildup height that allows the last step to have the same height as the other steps? hanse987 schrieb:
The staircase will likely have already been installed by your builder. Each step in a staircase has the same riser height. If you choose a floor buildup height that doesn’t match the step height, you’ll end up with a real tripping hazard. That’s the main issue. Let’s assume we’re talking about a 4cm (1.6 inch) floor buildup above the rough slab surface: that difference between the staircase exit and the first finished room floor is noticeable as a ramp. So this needs to be taken into account for the staircase — but only before the staircase is installed, meaning during the planning stage.
christophen schrieb:
Isn’t it possible to put something under the steps so that all (really all) steps are a bit higher? We wanted to close off the open area under the steps anyway. Using my example of the extra 4 cm (1.6 inch) spread over 16 risers: do you seriously want to add 2.5 mm (0.1 inch) to the first step, 5 mm (0.2 inch) to the second, 7.5 mm (0.3 inch) to the third, and so on? By “open area under the steps” you probably mean missing risers? (That’s not only a poor solution but also looks really bad!)
christophen schrieb:
Yes, I think most readers have understood the idea from a few posts ago, just not me as the original poster. Join the other readers and understand it yourself as well. Consider your 11 mm (0.4 inch) clearance as the MAXIMUM height for your preferred floor covering.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
schubert7926 Feb 2022 06:42Do you have radiators on the upper floor? Or is wall heating installed? What type of heating system is installed, and what is the supply temperature?
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