Incorrectly constructed roof trusses (pictures available)

[justusandersson]

The only long-term load that trusses are subjected to is their own weight, and that is quite limited in relation to snow loads. I guess the dimensional deviations (which are small) are more likely due to drying. That's probably what you should focus on when ordering new ones.

 

[Onsalakorven]

The only long-term load that trusses are subjected to is their own weight, which is quite limited compared to snow loads. I guess the deviations in dimensions (which are small) are more likely due to drying. That's probably what you should focus on when ordering new ones.

Great answer! Sounds very logical!

Best regards, Andreas

 

[Stefan1972]

I honestly believe that 2-5mm falls within the margin of error anyway.

 

[Nyfniken]

5 mm is well under a carpenter's precision? Make the new ones according to the drawings, otherwise it will be a copy of a copy.

 

[Alex@stallerhult]

Why order new ones? Just a lot of unnecessary demolition work..
Nail on new sub-flanges/tension bands in the desired inclined position, add necessary diagonal braces between upper and lower frames, cut away existing lower frames, sparse and plaster....
I've constructed such things a few times, it's not very complicated if you can get the stuff up to the attic.

How high will the new rafters be at the ridge?
Can you access the wall plates where the rafters rest?

Kind regards, Alex

 

[Papphammar666]

Screw you joist hangers.
Feltema/Bilbuttericks has cheap joist hangers.

Bought cheaply at Bxxxmax and the dimensions in every direction must have been from some Romanian construction from 1975, but you get what you pay for...