Thank you for the calculation.
Just a note for others that load might be carried to the floor via an internal wall. But… imagine someone later relocates a “non load bearing wall” and creates the load path Darren described.
Is it a mid span repair? You measure it? You see the purlin. That strut is mounted vertical. That makes the repair 3/4 down from the ridge.
Still have no answer if there are rafter collar ties.
The only repair application defect, in my point of view, is how the (1) repair lumber is fastened and angled.
Then it’s even worse. 261 pound point load.
The issue is two-fold: the improper repair, and the new load path. Should be re-done without the vertical prop.
1 Like
What happens when 261 pound home inspector traverses the attic atop those ceiling joists?
The under Purlin takes up load
I though the mid-span was the weakest point.
It’s an inclined beam. Also, if that is an under purlin, it’s transferring even more load to the vertical prop.
But the “brace” transfers a lot of load to… some random place below.
To my eye the brace is the worst part of the repair…
1 Like
Purlins are beams. Redundant.
What’s being used to support the purlins? Can’t see in the image.
Either or, rafter transfer loads to structural components.
Midspan the weak point?
In general, the reactions at the ends of a rafter are not equal because it is an inclined beam. The reaction at the lower end is higher. Likewise, a midway support along the rafter will have a greater reaction force if it’s located at the 1/3rd point compared to one at the middle.
I have some great photos of what happens to a Cape Cod living room ceiling after a heavy snow when the attic gets finished off with low-height eave walls that are nailed to the rafters at the 1/3rd point, and they neglect to reinforce the attic floor joists.
3 Likes
Good explanation.