Is a wooden beam ceiling and tiles up to 120 cm possible?

Hello,

we are in the middle of our major renovation and have apparently encountered a problem. We would like to tile the bathroom on the first floor with tiles up to 1.2m edge length.

Problem: wooden beam ceiling and the next problem is that we would have to realize the level for the construction at beam height or can be a maximum of 10mm above, otherwise we would create an edge/step in the room.

so we would have to create a load-bearing surface between the beams in order to then seal and tile it.

in the picture you can see the floor plan of the bathroom based on the opening of the beams. The walls will be constructed in drywall.

Is there a possible construction to realize our wish without the tiles breaking?

We thought of the following construction.

Set the false floor all the way down and pour in a lightweight clay granulate, then supports on the beams for fitted 25mm OSB panels and glue dry screed onto the OSB panels, then seal, adhesive and tiles.

theoretically we have a build-up height of 22mm from the top edge of the beams to the floor of the neighboring room. That means we could go 10mm above the beams if we calculate 12mm for sealing and tiles. Therefore there is also the consideration to replace the dry screed with a cement screed, which would then be applied to the OSB panels and cover the beams by another 10mm.

We are open to ideas and advice and look forward to everything that comes.

Best regards

Anni and Marcel

Do I understand correctly that you want to lay floor tiles in XL format? Our tiler installs a maximum of 60 x 60 on beam ceilings and even then only without guarantee. The ceilings simply flex too much and old houses never completely settle, so there are always tensions.

Morning,

well, it would be our wish. Therefore the question here is whether it is possible and if so, how it can be realized with our conditions.
I took some measurements yesterday.

The beams have a distance of about 50cm and are 11cm wide and 16cm high.

The beam with the old installation rests on a wall on the ground floor. The two behind it span 2m and the first two, probably the critical ones, span 3.3m.

Except for the first two beams, the rest seem extremely solid.

Best regards

So I would say that is rather unlikely. Our tiler would have refused. We have wooden beam ceilings, on top of that a floorboard. On that, we have a loose fill, dry screed, screwed and staggered double-thick OSB boards. The tiler jumped on that and considered it sufficiently stable. But with 30x60 tiles and our bathroom is small (less than 5m2). Neighbors have worked with uncoupling mats. But also significantly smaller tiles. You probably have too little build-up height to achieve stability for such tile sizes. But that is my layman's opinion. Are you laying the tiles yourself or using a tiler? If tiler: talk to them about it. I also seem to remember that dry screed is not suitable for such sizes, but I could be wrong. The manufacturers have exact specifications for that.

And tell me something about the house, how old is it? I’m just asking out of interest, the renovators are in the minority here, so I’m interested in every project.

Hi, yes gladly.

It is about a house built in 1955 in the Südpfalz. With a great extension and tobacco barn on a nearly 700m2 plot. The house of my partner’s grandmother.
Approx. 150m2 living space on 2 full floors and a partially converted attic as well as a laundry room as an extension. Fully basemented.

The substance was consistently described as very good by some experts.

We are renewing everything, electricity, water, sewage, heating. We are going for pellet heating, underfloor heating and ceiling heating, so only surface heating to be prepared for the future.

We are changing the room layout by removing walls and are doing everything ourselves so far, although we have only been in the house for 4 weeks and will finish the gutting this year and can start rebuilding from 2023.

But even during the rebuilding we want to do everything ourselves or at least try. What will be done is the heating with solar thermal, water and sewage. Electricity will also be done ourselves but inspected by a professional company.

If there is interest in the project, if available, feel free to check out Instagram or Tik Tok. Tik Tok gets more updates, Instagram subsequent summaries. You can find us under Forststraße_1955

Attached are a few excerpts of the pictures, if you have any questions just ask, it would simply be too much to write everything in detail.

Greetings