I just bought a new property with a large garage and I'm curious about the roof structure. The roof structure is supported entirely on the front/rear walls using rafter and collar ties. The rear wall is block and the front wall is just a few posts between doors with framing on top (the front has an overhang over the aprons, so the walls are different heights). You can see the rafters are notched in front to sit on this framing. However, there are a total of 3 tension cables that are attached toward the rear of the rafters using a clevis and an eye bolt in front (there is a plate and nut on the other side of what looks like stacked 2x6). What I'm curious is why these tension cables are there and what they are doing (if anything at all). The one in the picture is somewhat in the way of where I plan to install a small lift and would like to remove it if possible.
During the home-buying/inspection process we've heard many things about these cables:
- it was temporary for construction
- it's a "repair" to keep the front wall stable from spreading because it was shifting
- it's necessary to counteract the moment on the front wall due to it not really being a wall (but shouldn't the rafter ties be handling this?)
However, the one cable in question here has clearly been stretched and damaged over time, the bolt holding the clevis seems much too small to me to deal with any real force in a heavy load situation (e.g. snow), AND I can easily deflect the cable about 1.5" with a single finger, which leads me to believe even if it was supposed to be there, it's not really doing it's job anymore... the rafter it's bolted to also already has a 20' rafter tie, and the front rafter is sitting on that same 4x4, and the notch should allow the front rafter to counteract forces in the same direction as tension on the cable... unless the cable is just to support because the rafter tie is not large enough..
Has anyone seen anything like this before and can comment on the effectiveness or necessity of these tension cables?
From what I've read tension cables like this, even if used in the past, are pretty much useless over time unless you install them with turnbuckles and adjust them every year or so... makes sense. I can guarantee these things have been there as-is for at least 25 years. Not sure if I need to explore reinforcing properly or just ditch the cable.
Thanks in advance! Pics below:
You can see the cable on the other side of the garage door track, hard to see in the light Clevis bolted to rear rafter Front eyebolt through 4x4 The cable has clearly been stretched beyond capacity or kinked/damaged at some point