Calculation floor joists small cabin

[Rush64]

Hi, we are going to build a cabin that will be 7x3m. The cabin will be on a foundation of joists made of 170x90mm C24 ragelar.

The question is now, can 170x45 floor joists span 2920mm with a laminated chipboard floor? The floor joists will also be reinforced with a 45x45 on the underside on each side as support for the bottom of the frame.

I want to avoid a center beam and noggings.

 

[fribygg]

The question now is, can 170x45 floor joists handle a span of 2920mm with glued floor chipboard?

Yes.
If I were you, I would settle for placing a 1x5" board under the floor joists to support the subfloor.

 

[Rush64]

Yes.
If I were you, I would be satisfied with placing a 1x5" board under the floor joists to support the trossbotten.

It's a nicer alternative.

 

[fribygg]

The cabin will be on a beam foundation consisting of beams that are 170x90mm C24.

Odd

 

[Rush64]

Odd

The idea with 90mm is that we screw double 170x45 as an outer frame to get more even load on the ground screws. At the same time, it increases the torsional stiffness for the floor joists, right?

 

[fribygg]

The idea with 90mm is that we screw double 170x45 as an outer frame to get more even load on the ground screws. At the same time, it increases the torsional stiffness for the floor joists, right?

Double 45*170 is not unusual at all.

 

[Nickesågen]

Hello, we are going to build a cabin that will be 7x3m.
The cabin will stand on a framework foundation consisting of beams that are 170x90mm C24.

The question is, can 170x45 floor joists handle a span of 2920mm with a glued floor particle board? The floor joists will also be reinforced with a 45x45 at the bottom on each side to support the underlayer.

I want to avoid a central beam and bridging.

According to Swedish wood standards, they can handle a free length of 2970. Best regards.
Skip the 45x45 on the sides and instead place a 22x95 underneath.

 

[Rush64]

Double 45*170 is not unusual at all.

Hi, according to Swedish timber, they can support a free span of 2970. Best regards. Skip 45x45 on the sides and place a 22x95 underneath instead.

It will be 40cc between the floor joists, we landed 180mm over the values in the table with 60çc. Absolutely do not want a center beam.

 

[Rush64]

Hello, according to Swedish wood, they can handle a free span of 2970. Regards.
Skip the 45x45 on the sides and set a 22x95 underneath instead.

I want to save as much space under the joists as possible, must build low. That's why I choose to nail battens for the subfloor against floor joists.
Is it okay to nail the tongue-and-groove boards to the subfloor with electro-galvanized 16g or will they rust away?

 

[Nickesågen]

I want to save as much space under the beams as possible, I need to build low. Therefore, I choose to nail battens for the cellar ceiling against the floor joists. Is it okay to nail the rough board in the cellar ceiling with electro-galvanized 16g or will they rust away?

Hi, I wouldn't do that. Previously, they didn't even nail it. Screw/nail everything with suitable nails instead. It's enough with chipboard screws 42mm or 50mm finish nails. Regards

 

[Rush64]

Hi, I wouldn't do that. In the past, it wasn't even nailed. Screw/nail everything with appropriate nails instead. Chipboard screws 42mm or 50mm finish nails are sufficient. Regards

I wanted to use electro-galvanized 50mm finish nails that I already have at home.
The roofing board should just be nailed from inside the ceiling cavity, no direct load. It just needs to be held in place.
I'll probably go with electro-galvanized anyway.

 

[Rush64]

Now I have a consideration, the span is 180mm too long for the floor joists according to all calculation models.
One alternative is a central beam, but I am thinking about concrete slabs as support under the floor joists.
The frame around will be on ground screws.
What do you think about this?