ᐅ Two different tables – structural engineering?

Hello

Both tables refer to the same product (solid wood ceiling).
Why are there these differences?

Thank you and best regards

If I understand correctly, the first table is based on the current Eurocode, and the second one follows DIN 1052, which has been replaced by the Eurocode.

How does such a large difference come about?

The spans are almost the same. You should note that the table according to the Eurocode distinguishes between permanent and imposed loads. If you have a permanent load of 0.5 kN/m² and an imposed load of 2 kN/m², the span from the other table with a load of q = 2.5 kN/m² is almost identical.

no, example

Table 1 walkable floor slabs:
- permanent load (screed) 1.5 kN
- live load in category A 2.0 kN
combined total 3.5 kN
maximum span for 12 cm (5 inches) slab
3.8 meters (12.5 feet)

Table 2 3.5 kN
maximum span for 12 cm (5 inches) slab
4.9 meters (16 feet)

In the first table, which is the normal case for you, a distinction is made between static and dynamic loads, self-weight is included, and especially the vibration check is considered.
The second table only addresses deflection, and I’m not sure whether self-weight is included there.
A slab like that may support the load and possibly meet deflection requirements, but if the glasses in the cupboard rattle, that is not very pleasant.

Conclusion: for you as a home builder, only Table 1 is relevant.

By the way, greetings to Allrounder in MOL if you read this. Just can’t resist when something like this comes up.

Addition: I am referring here to an apartment ceiling; it is somewhat different with a roof ceiling, as vibration is not relevant there.
What do you see as the purpose of this type of solid wood ceiling?
Best regards