Loft beam removal

[noseall]

some random bloke on the internet.

Do you disagree with what I have said?

Its not there to prevent spread.

 

[^woody^]

You try convincing them lot ^^^^.

I will recommend my new book for their Christmas stocking ....if they have not been naughty this year.

https://imgflip.com/memegenerator

 

[noseall]

I will recommend my new book

Can I have a copy please....

 

[^woody^]

Can I have a copy please....

I've texted the man for you. Check your stocking on the 25th, the decision is out of my hands, sorry.

 

[Leofric]

It must be nowt nor summat then noseall if it's half way up!

 

[clifford1]

it's further up it's in compression preventing deflection or stabilising the ridge.

I don't see that.
If you prop two bits of wood against each other on a slippery surface they will try to splay out. You can stop them doing that by tieing a cord between them at any point along their length, even near the apex.

 

[^woody^]

I don't see that.
If you prop two bits of wood against each other on a slippery surface they will try to splay out. You can stop them doing that by tieing a cord between them at any point along their length, even near the apex.

That's right, but where the chord (collar) is placed will depend whether its in tension (lower half of the rafter) neutral (centre) or in compression (top half). Likewise, that will determine what the collar is actually doing - stopping spread (lower half) stopping deflection (upper half).

But even when the collar is in the upper half it can prevent spread by preventing the ridge dropping - however in this case the ceiling joists are preventing spread, so that is not this collar's job.

 

[clifford1]

That's right, but where the chord (collar) is placed will depend whether its in tension (lower half of the rafter) neutral (centre) or in compression (top half).
.

But in my example of the two sticks tied together with a piece of string, it can't be in compression. If the ends of the sticks splay out, then they will move apart throughout their length - mostly at the bottom, a bit at the top, but the string will still be in tension. You can't push with a piece of string!

 

[bernardgreen]

You can't push with a piece of string!

Off topic. You can push with a piece of string.

Soak it in water, then leave in the freezer until frozen stiff. Push gently

School science lesson 1960's

 

[^woody^]

But in my example of the two sticks tied together with a piece of string, it can't be in compression. If the ends of the sticks splay out, then they will move apart throughout their length - mostly at the bottom, a bit at the top, but the string will still be in tension. You can't push with a piece of string!

I'm not sure what point you are making.

My posts related to the position of the collar determining what function it was performing.

 

[blup]

But in my example of the two sticks tied together with a piece of string, it can't be in compression. If the ends of the sticks splay out, then they will move apart throughout their length - mostly at the bottom, a bit at the top, but the string will still be in tension. You can't push with a piece of string!

Presumably the weight of the roof, and wind and snow loads, will contribute to compression of the tie/collar the nearer the ridge it is.

Blup

 

[wessex101]

I don't see that.
If you prop two bits of wood against each other on a slippery surface they will try to splay out. You can stop them doing that by tieing a cord between them at any point along their length, even near the apex.

Good luck with that. You try tying a pair of rafters near the ridge and see how effective the tie is. Generally any tie/collar above the bottom third will not work and even if it did you would still have to take account of the spread affect caused by the deflection in the rafter feet.