Snailman
Are all trusses self-supporting, or are there ones that need support in the middle, like a heart wall?

(I'm thinking of using scissor trusses and truss girders, and I want them to be self-supporting)
 
Hello Snailman!
Roof trusses are manufactured and dimensioned according to the conditions you have.
If they are to be free-standing, the truss is adjusted accordingly.
However, you get quite large and cumbersome constructions if the span becomes too large.
However, it should not be a problem if the house stays within reasonable proportions.

If you buy prefabricated standard trusses, you should receive a specification on how these should be assembled.
 
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