What do you think about the truss, self-supporting?

[Jeber]

Hello,

I am considering opening up between the kitchen and living room. The house and all interior walls are made of lightweight concrete. I'm wondering if the roof trusses are self-supporting so that I can just tear down the interior wall. The house was built in 1969 and is located in Skåne outside Lund.

 

[justusandersson]

Yes, that type of trusses are self-supporting. In principle, one might add because it's not possible to read any dimensions from the photo.

 

[ArneTW]

A lot of force is indeed applied to the bottom part, so a wall at the base of the V's would help somewhat...

/ATW

 

[Jeber]

Yes, that type of trusses is self-supporting. In principle, one might add because it's not possible to read any dimensions from the photo.

I also think it looks like that, but I should probably ask an expert before I tear down the interior wall.

Difficult to take pictures of drawings

the entire truss is 955 cm height to ridge 258 cm can check more dimensions if it helps?

 

[justusandersson]

The dimensions of the upper frame and lower frame are the most interesting.

 

[Autodidak1]

The dimension looks a bit weak (2"x5")

 

[Jeber]

I have heard that you should be able to redistribute the load in the attic to avoid having a huge beam in the house. How does that work if it turns into a belt and suspenders solution

 

[justusandersson]

It can work over a shorter distance. A little difficult to raise the beam.

 

[Jeber]

It might work over a shorter distance. A bit difficult to lift the beam.

The idea is to bring it in with a crane truck via the gable that will be replaced during the summer

 

[richardtenggren]

The difference is that it's the attachment in each rafter that carries the load instead of just being supported from underneath. I will do a similar thing and my 7m glulam beam is already in place in the attic. So it just needs to be positioned correctly and attached to the rafters before I tear down the central wall in spring.

I'm thinking of using fork anchors as fasteners for the glulam beam.

 

[justusandersson]

There are some obvious problems. For example, dimensioning it correctly so it serves a useful purpose. The beam needs supports at the ends and preferably also in the middle, ideally in the form of columns that should be brought down to the foundation. It will be a very long beam. Fork anchors, in my opinion, are quite weak. I suggest bent band steel.

 

[richardtenggren]

Yes, they feel a bit weak, but I thought I would check what they are dimensioned for before discarding them. Otherwise, an equal angle iron around 40-50 mm in S235 is probably cheaper too. But it requires a bit more work.

In my case, the beam will be supported by the cast heart wall in the basement, and as you helped me with earlier, no actual beam is needed in my case.

 

[Jeber]

Feels like the only sensible option is to check with someone who really knows. I'll go and consult with a designer and bring all the drawings. But thanks for all the answers

 

[Violina]

Feels like the only sensible option is to check with someone who really knows. I'll have to go and consult with an engineer and bring all the drawings. But thanks for all the answers

You're getting answers here in the thread from someone who really knows; @justusandersson

 

[Jeber]

Is there a good constructor near Lund that is recommended?