I've started drafting a terrace roof. There are some threads about shear forces and that a pergola/terrace roof can become unstable laterally if you don't use braces.
1) Can you use stronger angle irons instead of braces?
In other words, replace these with strong angle irons:
(borrowed image)
2) If the post for my terrace roof is going to be 3 m, can I then dig the post 120 down and pour concrete for stability?
Can one use stronger angle irons instead of braces?
It helps, but doesn't replace it in all cases.
DDerbyboy said:
can I then dig down the post 120 and pour concrete to gain stability
It provides stability, but there's a certain risk of shortened lifespan when it stands in direct contact with moisture migration via the concrete. I think it's overkill to cast the posts; it should work without it.
But it all depends on what kind of roof you have and if the construction is anchored to the house. If it's a stable roof, it braces the construction, provided that one side is anchored in the house.
Make sure it's adequately braced while you're building. Then, test how much extra you need, like braces, to have it stand steadily.
On terraces and sometimes roofs, you can see that the two outermost sections are narrower, for example, if I have cc 100 between the joists, the outermost ones might be only cc40-50. What are these narrower sections called?
I assume it's for lateral stability, but are there any rules for how wide these smaller sections should be?
