Loft beam removal

noseall · 13 Dec 2018

Nakajo said:
some random bloke on the internet.

Do you disagree with what I have said?

noseall said:
Its not there to prevent spread.

^woody^ · 13 Dec 2018

noseall said:
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 · 13 Dec 2018

^woody^ said:
I will recommend my new book

Can I have a copy please....

^woody^ · 13 Dec 2018

noseall said:
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 · 13 Dec 2018

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

clifford1 · 16 Dec 2018

^woody^ said:
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^ · 16 Dec 2018

clifford1 said:
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 · 17 Dec 2018

^woody^ said:
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 · 17 Dec 2018

clifford1 said:
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^ · 17 Dec 2018

clifford1 said:
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 · 17 Dec 2018

clifford1 said:
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 · 17 Dec 2018

clifford1 said:
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.

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Loft beam removal

Leofric

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