I'm thinking of building a small loft at home. I feel like I want to save as much ceiling height as possible and therefore have the thinnest load-bearing floor possible. The surface will be 2x3 meters and the floor span will be 2 meters, attached between a load-bearing wall and a glulam beam.

A little flex doesn't matter, and the surface type doesn't matter. It will be used as a cozy corner/guest space.

I've been looking at tongue and groove pine flooring that is 45 mm thick. Could that be enough?
 
KMolinder KMolinder said:
Planning to build a small loft at home.
Feel like I want to save as much ceiling height as possible and therefore have as thin, load-bearing floor as possible.
The surface will be 2x3 meters and the floor span will be 2 meters, fixed between a load-bearing wall and a laminated wood beam.

A little flexing doesn't matter, and the type of surface is irrelevant. It will be used as a cozy corner/guest area.

I have looked at tongue-and-groove pine flooring that is 45 mm thick. Could that be enough?
Hi!
The answer is no!
You cannot build a wooden floor without joists, wires, or anything else that supports the floor.
If you have thicker flooring, it becomes heavier and will sway more.
3 joists at 45*145 with a 25mm solid wood floor is sufficient, flexes a bit but it holds.

But if you want the floor to be rigid, you should have at least 45*170 with a maximum of cc 600.

The joists should be upright as joists should be, not lying flat.

You can support the weight with metal joists and diagonal braces from underneath, from the wall towards the floor/ceiling.

Best regards, P-A
 
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KMolinder
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If I go with 145 + 25, it becomes 170 mm thick. It's not enough.

Is it possible to go down to 45*120, or even 45*95 if they are placed closer together?

As mentioned, thickness is the most important thing.

Supports from underneath will be in the way.
 
Can you take a picture of where you plan to have the loft, there are often several solutions if one can see the conditions?

Best regards, P-A
 
P Pagno said:
Can you take a picture of where you plan to have the loft? There are often several solutions if you can see the conditions.

Regards, P-A
I will gladly do that when I get home!
Thank you!
 
KMolinder KMolinder said:
I will gladly do that when I get home!
Thanks!
Feel free to take pictures from different angles, up towards where you want the ceiling, or the floor. Then you might not expect to get the solution directly this evening. There are many knowledgeable people on the forum, it's just a matter of them finding your post.

Take care in the meantime!

Regards, P-A
 
If it is not possible to support downward, the alternative might be to create an upward support. That is, a column against the ceiling from which the floor "hangs." This can reduce the dimensioning.
 
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J Jorak said:
Check out flat slabs: [link]

//Jorak
Interesting suggestion, but flat slabs often require a joist or framework from the top side. The point of the flat slab is that you can have long distances between joists/slabs. But the idea, as a basic concept, is good in combination with a cable or, as @BerraBo suggests, a post that transfers the load to the existing roof and intended floor.
 
2 pieces of screw-glued 45x120 become as rigid against deflection as a 45x145.
 
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Nötegårdsgubben
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http://www.weland.se/sv-se/laettdurk/
Lättdurk is an option. Handles 2 meters span and has a thickness of 48 mm.

Will take some pictures tonight so you can give good advice and encouragement!
 
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Haven't calculated this, but 45x95 reglar that are screwed and glued in place.
Then you have both the framework and the floor ready at the same time,
3D illustration of a wooden floor structure made from 45x95 joists, demonstrating combined floor and frame construction.
 
Peter2400 Peter2400 said:
Haven't calculated this, but 45x95 studs that are screwed and glued in place.
Then you have both the framework and the floor finished at the same time,
[image]
The idea is good, unfortunately, it becomes heavy, a little too heavy to manage as a floor.
 
Peter2400 Peter2400 said:
Haven't calculated this, but 45x95 studs that are screwed and glued in place. Then you have both the joist and floor finished at the same time, [image]
But, if you drill through, skip the glue, have good walls, pull a wire through, passing, tighten "the floor" you have a nice hammock model.

Hmmm, fun idea if nothing else.
 
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