Tool enthusiast
· Estocolmo
· 1 056 posts
Hi
I am going to perform a strength calculation for a wooden ladder that I am going to build.
Anyone have any idea how to do it?
I am planning to build a 9-meter ladder that will lie at a 45-degree angle on a roof.
It can be a maximum of 55 cm wide and must use at least C24 graded construction timber.
I'm planning to have steps every 40 cm and use 45x45 studs.
All tips are appreciated.
I am going to perform a strength calculation for a wooden ladder that I am going to build.
Anyone have any idea how to do it?
I am planning to build a 9-meter ladder that will lie at a 45-degree angle on a roof.
It can be a maximum of 55 cm wide and must use at least C24 graded construction timber.
I'm planning to have steps every 40 cm and use 45x45 studs.
All tips are appreciated.
Tool enthusiast
· Estocolmo
· 1 056 posts
I work as a sheet metal worker and will make a ladder for myself.J jonaserik said:
Plåtis and asks? Why in wood, it's a material that on roofs rots over time. Why not take an aluminum ladder, put legs on it, anchor it at the ridge and eaves. Otherwise with timber if it should lie flat on the roof, 45X95 is enough as longitudinal and the same as steps. No construction timber needed.
Tool enthusiast
· Estocolmo
· 1 056 posts
Metal ladders scratch the sheet metal so it's not an option and the ladder shall only be used for a specific task, the requirements for load calculation and at least C24 graded structural timber come from one of our government agencies.J jonaserik said:
Why should it be strength calculated when it's going to be on a roof?
If they want to see something, maybe you can include the strength of the fasteners you used to secure the pins, as that is the only thing that will be stressed...
If they want to see something, maybe you can include the strength of the fasteners you used to secure the pins, as that is the only thing that will be stressed...
Tool enthusiast
· Estocolmo
· 1 056 posts
Rickard. said:
Message from the government agency ->
1.2 Ladder/work platform You must replace the self-made ladder/work platform. At the very least, there must be strength calculations for the construction, and use C24 construction-grade timber. See 57 and 58 §§ AFS 1999:3, 3, 10, 11 and 12 §§ AFS 2004:3 as well as 9 § AFS 2013:4.
We currently have one made of 25x38 batten and the government agency did not like that.
So fantastically nerdy.
Unfortunately, most of the structural calculations made (at least in smaller constructions) are based on standard cases. And as far as I know, there aren't any standard cases for how to construct such a ladder, because it isn't really necessary.
If I were you, I would go to one of the larger lumber yards and ask if they have a good designer contact. A designer could relatively quickly put together some calculations with nice formulas that would convince even a bureaucrat. But of course, you'll have to pay for it.
Unfortunately, most of the structural calculations made (at least in smaller constructions) are based on standard cases. And as far as I know, there aren't any standard cases for how to construct such a ladder, because it isn't really necessary.
If I were you, I would go to one of the larger lumber yards and ask if they have a good designer contact. A designer could relatively quickly put together some calculations with nice formulas that would convince even a bureaucrat. But of course, you'll have to pay for it.
So incredibly silly and ignorant, a ladder lying on a roof doesn't support anything....
the performance declaration from fastenings and 45x70 or something like that which is so incredibly over-engineered, they should really stop. I'm thinking 45x70 since it is used in so many different fall-through safe systems on cc 120...
the performance declaration from fastenings and 45x70 or something like that which is so incredibly over-engineered, they should really stop. I'm thinking 45x70 since it is used in so many different fall-through safe systems on cc 120...
Tool enthusiast
· Estocolmo
· 1 056 posts
It should be a temporary ladderH Hybro said:
You can't have pressure-treated wood against metal roofing, as it will cause the metal to rust
Tool enthusiast
· Estocolmo
· 1 056 posts
Unfortunately notR RiKr said:
Since it is supposed to lie against the ceiling, you only need to calculate the rungs themselves, right? A 50 cm long stick resting on supports at both ends and loaded with a point load from a foot in the middle is one of the simplest load cases to calculate.