The Roof is Sagging, how to make a Template for Beadboard?

[ZeroKnowledge]

The ceiling is sagging and I have this small level difference left to put beadboard on. How do I make a template of the sagging to cut the beadboard correctly? It seems the ceiling goes down about 5-6cm in the middle of this 4m long room.

Thanks in advance!

 

[richardtenggren]

Feels like a bit too much deflection, especially in summer when the roof is unloaded? But maybe it's just an old house? Normally, ~L/300 is accepted when designing beams. With these values, you end up with <L/100.

To get the profile, you can place a plank parallel to one of the roofs but with an appropriate offset. Then you use a block as a spacer to "scribe" the arc shape. You adjust the thickness of the block in relation to the offset so the profile fits.

 

[ZeroKnowledge]

Feels like a bit too much deflection, especially in summer when the roof is unloaded? But maybe it's just an old house?
Normally ~L/300 is accepted when designing beams.
You probably end up with <L/100 with these values.

To get the profile, you can set a board parallel to one of the roofs, but with a suitable offset. Then use a block as a spacer to "scribe" the curve shape. Adjust the thickness of the block in relation to the offset so that the profile fits.

I half understood what you mean;

Should I set a board straight with a level, on the unequal surface that goes down several cm to accommodate the entire slope? Then I take a small block as a spacer, place a pencil against it and draw a line along the entire board? Am I thinking right?

Then, in that case, I have the slope that the lower roof has. Should it reasonably be approximately the same slope as the upper roof, where I am going to place the first step?

 

[richardtenggren]

Check out this link;
https://www.carpentry-tips-and-tricks.com/how-to-scribe.html

At the same time, maybe you can force the pärlspont so that it gets the same curvature? Otherwise, there is a risk that the sagging will become extra noticeable.

 

[ZeroKnowledge]

Check out this link; [link]

Maybe at the same time, you can force the beadboard to have the same curvature? Otherwise, there's a risk that the sagging will become more noticeable.

Thanks for the link!

I understand what you mean, that maybe it emphasizes the effect of the sagging ceiling, but unfortunately, you can't bend the beadboard that much...We'll see how it looks once everything is in place! At least it will be a fun exercise in how to scribe! What is it called in Swedish, to scribe? So I can search for it more later.