Hello,

I need to fasten a beam in a slanted ceiling, and it needs to sit so that the underside of the beam is horizontal when it's fastened. That is, the cross-section of the beam needs to be like a triangle, split along the same angle as the roof's slope. It will be about 4 meters long.

Is this something that can be done by oneself with a circular saw? Is it possible to get help somewhere to buy such a beam and where should one turn in that case?
 
The easiest way is to use a table saw, but a handheld saw works fine too. Test on a scrap piece before cutting the long board.
 
It becomes a much thinner rule if done that way? I think the normal approach is to insert an angle at each attachment point instead, so that the underside of the rule doesn't rest against the wall.
 
P
Find out which angle you want. Go to a good building supply store that has a good saw and ask them to cut a beam. It may cost you ten kronor but it will be so much faster.
 
P
Alternatively, use a chisel to notch the rule. It doesn't need to be precise if you're going to put something in front of it, or maybe you're not going to...
 
Unfortunately, I don't have a table saw.

Well, it becomes weaker, of course, but what I need to do is build a partition wall with a sloped roof, and I need the studs to be attached to something. I thought that with one of those in place, I can simply angle the studs into the ripped beam, and I can screw the ripped beam into the rafters. An alternative is, of course, to cut each stud at the top with a miter cut, which is simple, but it becomes difficult to attach them to the ceiling since most won't end up right at a rafter.

On the other hand, maybe a simpler solution would be to cut the studs after all and somehow attach them with bent angle brackets into the gypsum ceiling using drywall expanders? But it's still tricky to get the angle brackets in place in a good way.
 
As mentioned: a triangle at each rafter. Screw a whole board onto the triangles.

Normally, you would have vertical studs, one at each rafter, beveled at the top. OSB outside of that, and then gypsum.
 
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