Saw off horizontally at the eaves, okay?

[ChOff]

Hello,
I want to cut the rafter horizontally at the eaves, as shown in the picture, to be able to install boards where I will mount downlights.

Can I do this without jeopardizing anything?

Best regards

 

[maah]

If you cut along the line, you'll have a small wedge left towards the facade. Then you can take something like a 45x70 regel and screw it against the rafter, giving you something to screw into all the way in.

 

[ChOff]

If you saw along the line, you'll have a small wedge remaining towards the facade.
Then you can take something like a 45x70 rule and screw it against the joist so you have something to screw into all the way in.

Thank you! That sounds like a good idea.
A dumb question perhaps, but this is nothing that affects the load-bearing capacity of the joist etc.? It is under the joist's lower arm.
The joists are W-type.

 

[maah]

Yes, it affects. But only the 2-3 boards at the very edge of the roof.
And it doesn't affect in a way that poses any risk.

 

[ChOff]

Thought of something else: could there be a problem with heat from the downlights rising to the attic and condensing against the sheathing in cold weather? (Potentially leading to growth.)

I’ve had this issue in another place, but then it was warm indoor air from an exhaust fan in the facade where the warm air found its way up to the attic via the eave ventilation. Maybe there's a bit of a difference...

 

[maah]

No, it's so well ventilated that there are no problems.
The panel you put there should have a little gap with insect netting above.