Sorry for cross-posting, I would like to get some sense of this by tomorrow.
During the dismantling of our old roof windows, the roofers set the depth of the saw blade incorrectly. This resulted in them making notches in two roof trusses (on two windows). They said nothing, but I noticed this when I got home.
The notches are between 10mm and 13mm deep, and I assume the board is 45mm thick. Should I ask them to reinforce these with nail plates, or are other measures required?
Thanks!
During the dismantling of our old roof windows, the roofers set the depth of the saw blade incorrectly. This resulted in them making notches in two roof trusses (on two windows). They said nothing, but I noticed this when I got home.
The notches are between 10mm and 13mm deep, and I assume the board is 45mm thick. Should I ask them to reinforce these with nail plates, or are other measures required?
Thanks!
It will probably hold anyway, but if you sleep better because they take action, ask them to fix it!
Shouldn't they do something to make up for their blunders?
Shouldn't they do something to make up for their blunders?
The impact depends a little on where the cut is in the truss and depending on what type of truss you have. If you have a "swedish truss" and the cut is near the support post, it affects more. Optimally, the cut should be in the middle between the collar beam and the support post.
See moment diagram: http://design.medeek.com/resources/truss/study1/attictrussanalysis.html (image 4) You want the cut to be where there is as little color as possible (both green and blue).
Roughly, I would say that the beam's load-bearing capacity in bending moment has been reduced in that cross-section by about 25%.
Edit: sorry, it was image 4 I should refer to!
See moment diagram: http://design.medeek.com/resources/truss/study1/attictrussanalysis.html (image 4) You want the cut to be where there is as little color as possible (both green and blue).
Roughly, I would say that the beam's load-bearing capacity in bending moment has been reduced in that cross-section by about 25%.
Edit: sorry, it was image 4 I should refer to!
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