Going to build a new interior wall between the living room and the upcoming laundry room. However, I have trouble measuring so that the base plates are straight. I checked in a construction description and it said to measure diagonally against the adjacent wall. We can't do that, though, as the walls are the same length, this wall ends with the chimney. We also can't measure directly against the adjacent wall as that wall is of varying thickness.

How should we ensure that the new wall is straight?
 
The easiest thing is to stretch a string.
 
May test, it will be tricky because the chimney stack is anything but even, and I can't attach the string anywhere else.
 
It didn't work, it's not straight in the least. I'll have to try by eye measure then.
 
Laser levels aren't too bad for this type of task, I think (if I understand the question correctly). That way you can measure from the laser line.
 
ThomasLindgren said:
It didn't work, it doesn't become straight at all. I guess I'll have to try to eyeball it simply.
How do you manage to stretch a string without it being straight? And why do you have to attach the string to the chimney wall? The sill plate should be attached to the floor, so you could hammer a couple of extra nails into the floor and attach the string between them.

Or maybe I don't understand what you mean by "straight."
 
I want the entire wall to be straight, including the chimney. So I have to attach the string all the way at the end of the wall, at the chimney. But I think it's solved now, or rather I don't care if it's perfectly straight. I have a bigger problem now, and that is how I can attach a stud to the chimney.
 
Just be careful that the chimney sweep doesn't get picky. It seems to be incredibly meticulous with chimneys these days, but PL400 glue should make any stud stick unless it's too uneven. In such cases, I can imagine using frame screws where you drill out and secure the tip with 2-component glue in the chimney.
 
I took what I had. Redplugg that I put in the brick, then I drilled through the stud, and countersunk 57mm drywall screw through. Went better than expected, holds like a rock.
 
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