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Ok
This is some DIYing which is stretching my maths/knowledge.
(hopefully I am describing this well).
So I'm converting my attic into a living space (yes aware of regs, etc.)
It is 1930's Semi with, all ceilings down (the house is a shell).
New Steels installed at the front and back, under the perlin's
The problem is, the steels are sitting under the existing beams/joists, but too low and I want to move them up by a few inches. This would mean chopping out all beams to allow.
Which I believe would lead to the roof spreading/slipping.
So the thoughts are .
The diagonal struts in the roof (yep getting technical terms now rest on the outside wall (which is higher by 1 brick on the inner skin, due to the angle).
The horizontal beams sit on the inner skin and are nailed to the diagonals.
Are the horizontals stopping the diagonals from spread side wards AND skidding down?
My plans are:
1) Move each horizontal up by a few feet, one at a a time (to stop the sideways spread). This will change weights and add more on to the purlins.
2) Jack up the steel beams 4 inches and use large padstones
3) Install the new joists
4) Where the joists come close to the wall/diagonals, cut triangle shapes out of hardboard to screw to the joists and the diagonals to both horizontal and diagonal spreading. (I can't attach the joists straight to the diagonals due to the steels being in the way).
I'm hoping that everything is done in a weekend (steels are already in place, just need jacking up) so the diagonals will not be without horizontal support for more than 48hrs.
So if you managed to follow this, what do you think?
If it doesn't make much sense I can try to draw something.
This is some DIYing which is stretching my maths/knowledge.
(hopefully I am describing this well).
So I'm converting my attic into a living space (yes aware of regs, etc.)
It is 1930's Semi with, all ceilings down (the house is a shell).
New Steels installed at the front and back, under the perlin's
The problem is, the steels are sitting under the existing beams/joists, but too low and I want to move them up by a few inches. This would mean chopping out all beams to allow.
Which I believe would lead to the roof spreading/slipping.
So the thoughts are .
The diagonal struts in the roof (yep getting technical terms now rest on the outside wall (which is higher by 1 brick on the inner skin, due to the angle).
The horizontal beams sit on the inner skin and are nailed to the diagonals.
Are the horizontals stopping the diagonals from spread side wards AND skidding down?
My plans are:
1) Move each horizontal up by a few feet, one at a a time (to stop the sideways spread). This will change weights and add more on to the purlins.
2) Jack up the steel beams 4 inches and use large padstones
3) Install the new joists
4) Where the joists come close to the wall/diagonals, cut triangle shapes out of hardboard to screw to the joists and the diagonals to both horizontal and diagonal spreading. (I can't attach the joists straight to the diagonals due to the steels being in the way).
I'm hoping that everything is done in a weekend (steels are already in place, just need jacking up) so the diagonals will not be without horizontal support for more than 48hrs.
So if you managed to follow this, what do you think?
If it doesn't make much sense I can try to draw something.