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Michael Merino
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« on: September 27, 2009, 01:55:24 PM » |
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I know this is to stop rafter spread, but I can't remember the name for these. It is in a garage, the first 2 rafters only.
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David Macy
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« Reply #1 on: September 27, 2009, 09:01:43 PM » |
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Would cable tie downs be appropriate?
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Steven Turetsky
Location: Staten Island, NY
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« Reply #2 on: November 24, 2009, 10:15:33 PM » |
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Because they're made from cable, I guess I agree with David and would call thhem collar ties. If they were made of wood... and what should be there instead of the retro fitted cable ties are called "collar ties."
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Jay Markanich
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« Reply #3 on: November 26, 2009, 07:17:01 AM » |
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I have heard them called "metal straps," and "coil straps," ostensibly to prevent the bottoms of the rafters from spreading outward. A collar tie should be up withing 4' of the apex of the roof, intending to keep the roof from spreading upward or outward. If they are near the middle of the rafter they become unstable.
Two problems with this post-facto strap application that is pictured above: they can be tightened too much and force the roof upward (!) and do not have much wind load resistance.
Were they on the edge or in the center of the garage? Maybe someone removed the original truss structure because they wanted a storage loft or something? Depending on what the guy wanted to do, perhaps to prevent sagging in the middle of the roof at those rafter points, a scissor truss may have been a better installation.
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Steven Turetsky
Location: Staten Island, NY
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« Reply #4 on: November 26, 2009, 10:09:13 AM » |
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Jay is right, a coller tie is located closer to the apex. It would be a ceiling joist
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Marcel R. Cyr
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« Reply #5 on: December 03, 2009, 07:31:17 PM » |
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I saw that pic on the Nachi Board.
I think my response was that this garage, shed or what not, is old, has a low pitched roof, and they used an oversized 1/2"+/- steel cable to pull it back together. Probably no rafter ties or collar ties.
That cable is oversized for those puney turn buckles with open ends on them and whoever installed those cable clamps had no idea the amount of tension there was going to be.
The cable clamps are backwards, you never saddle a dead horse on a steel cable.
It would be my guess that the weight of the cable is doing the job of acting as the rafter tie.  
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William R. DeVries
Location: Kingston
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« Reply #6 on: December 29, 2009, 07:11:20 PM » |
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everything marcel said plus it needs eyelets with locking clasps as well, cable needs to be protected from the turn buckles and also there is now no way to remove the cables from the turn buckles if adjusting was needed.
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