First, a big thank you to everyone involved in this forum. I always learn something new when I'm here.
Now to the question. We are planning to install a masonry stove on the upper floor of our house, and I have started to worry a bit about the load-bearing capacity of the floor joists. I have found construction drawings that state the floor should withstand about 280kg/m2. The stove weighs about 280 kg, so I interpret this as it should be fine. However, there is a refrigerator and freezer on the other side of the wall which I guess weigh about 70 kg each, and they are essentially on the same square meter.
How do you, with a bit more experience, think this will turn out? Is there a risk of overloading or even a risk of a beam breaking? I am a person who likes to err on the side of caution, so I am considering installing a support post in the basement against the concrete floor on the beam under the stove to secure it. Would one support post directly under the stove be sufficient (blue cross in the drawing, but in the basement)? Would a support post on the adjacent beam (purple cross), where it's easier to hide on the ground floor, be enough?
The floor joists are reinforced lightweight concrete. A load-bearing wall runs through the middle of the house.
Very grateful for your opinions! Whether reinforcement is needed at all or its placement.
Before I delve into your problem, I would like to know what you mean by "murspis"? The joist seems to consist of lightweight concrete planks. Is that correct? What is the name of the manufacturer of the lightweight concrete? Is the murspis supposed to stand on the joist that is directly above the basement level?
Do not know what the manufacturer is called, or if it is plank. It is laid as beams approximately 50 cm wide. I think they are reinforced "into each other" as well. Excuse the layman's terms.
Exactly, the fireplace stands on the joist over the basement, on the upper floor.
So it's a type of wood-burning stove that you plan to connect to a metal chimney. I interpret it as you having 50 cm wide floor slab elements. It's actually quite important to find out who manufactured them. If it's Siporex, which no longer exists, it could be difficult to get documentation. When was the house built?
Thank you for the response!
Exactly, stove with metal chimney. It was built in 1986. Do you mean that different figures would apply than those indicated on the drawing (2.8 kN/m2)?
I think the expression "märklast" is a bit informal. Then there are other performances that may be interesting in this context. The Siporex factory was shut down in the early 2000s, so it could very well be Siporex that you have. I am quite sure that you can install the stove if you make a reinforcement directly under the floor structure. Whether it can be done without reinforcement, I dare not say without more information.
I think the expression "märklast" is a bit informal. Then there are other performances that may be interesting in this context. The Siporex factory was closed down in the early 2000s, so it could very well be Siporex that you have. I'm quite sure that you can install the stove if you reinforce directly under the joist. Whether it can be done without reinforcement, I dare not say without more information.
Doesn't 280 kilos per square meter sound a bit little as well? You can quickly reach that if you get an aquarium or waterbed, for example... If you invite two burly 2-meter men who weigh triple digits, they're not allowed to hug each other``
Thank you for the valuable input! In that case, is it enough with a stamp directly upwards against the beam from below (like https://www.stallning.se/product.html/stamp-altrad-a300) or should that load capacity also be distributed with a beam or something similar?
You need to distribute the absorption of force from the stamp over a larger area using a suitable construction, e.g., a beam across the lightweight concrete elements.
I also think that 280 kg/sqm seems a little, but the question is, what does "märklast" stand for?
In section 6.7 it states that the load-bearing capacity is calculated as
f = 1.3 * (self-weight + 1.3*(imposed load)) (all in kN/m2)
So, the question is what the beam's self-weight is. 4.1 m x 0.5 m x 0.2 m * density, what could the density be?
If you assume about 350kg / m3, the load-bearing capacity is at least over 400 kg/m2... if you dare to trust that.
The volume weight for reinforced slabs is a maximum of 660 kg/m3, which would provide a load-bearing capacity of over 600 kg/m2 if I have calculated correctly.
You can't make sense of this, but maybe you should reason like this, I have two Billy bookshelves in another place in the house, filled with books. I wonder what they weigh per m²...
There is a book called the Lättbetonghandboken. The last edition came out in 1993, I believe. If you can get hold of it, everything you need to know is there. One strategy can be to start with a support and then try to expand the knowledge. A weakness of lättbetong is the limited compressive strength, around 4 MPa I think. Therefore, it's important to maximize the contact area.
No, normally you would count on 2 kN/m2 as the useful load today in residential buildings. But those rules have changed a lot over the years, which could explain the figure.
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