Hey! I was at a construction site with a roof that is 17 meters long and 7 meters from the eave to the ridge, so it's not a small roof. None of these trusses have an underarm (I think that's what it's called, I drew a picture).

Now, I have a roof that is 4 meters long and 6 meters from the eave to the ridge. My trusses also do not have an underarm. Only supports at the ends. Is this sustainable?

I've been in contact with some builders who say you absolutely need an underarm. However, I contacted a truss factory and they said it's not something they typically do, but it's not a problem. Who the hell should I listen to?

Picture 2 shows what the truss looks like.
 
  • Roof truss diagram showing a missing bottom chord, labeled "FINNS INTE," and existing upper elements, labeled "Den finns." Triangular structure.
  • A simple line drawing of a roof truss, showing its structure with vertical supports but lacking an underarm, with an arrow pointing to the support.
Hello Bananaosten,
you might need to be a bit clearer.
Picture one: It exists, doesn't exist: WHAT is it that exists or doesn't exist. Hard to understand.
Picture two: Are the standing supports hanging in the air? Are they not standing on anything?
How old is the house? What do you mean by the roof being four meters long?
Maybe you can draw up the truss properly, with dimensions, and how the support looks.

//KoW
 
You probably mean under-frame. :)
 
As long as there is a beam that holds the outer walls together, I see no danger in it.
 
or a laminated beam at the top that carries the load to the gables/ load-bearing walls in the construction.
 
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