How to get the wall in angle?

[MrPeddaP]

We have torn down the walls on our upper floor because we thought that 5 cm of insulation and no air gap wasn't really good.. Now we are standing there about to put up a new wall, but since the house is from 1923, nothing is straight in the roof truss construction, so we can't base it on that.

How do you most easily get the wall at a right angle? Any smart tips?

 

[Mäster]

The Pythagorean theorem, if you don't have an angle in the box.. Or what do you mean ??

 

[MrPeddaP]

Yes, that's what I meant. I've been thinking about this with Pythagoras' theorem but was wondering if there was any other convenient way. An angle should be quite large to work on a wall, right?

 

[Mäster]

Well, 3+4 meters on the angle, then you have 5 on the diagonal, that should be enough.
A little less, 80+60 cm, gives a meter on the diagonal.
That's the "standard angle" I usually use.
Otherwise, you can use the calculator.
Then it depends a bit on the upper floor, and how the wall should go. Sometimes it might be better to abandon exact right angles and follow another wall.
For example, 3.8 m or something from the gable wall, then the angles will be as they are, but at least 2 walls will be parallel.
A tip for slanted walls: Avoid pattern matching on wallpaper...

 

[MrPeddaP]

That was a good answer! Thank you so much. No, I think we'll skip pattern matching... It will be white walls.. =)

 

[AndersS]

And then you can cross-measure, i.e. both diagonals are equally long, and mark the corners on the floor to make the room square with, for example, tape. But that assumes the walls are equally long. But I agree with the earlier note that sometimes during renovation, you have to start with what is practical.