There would also be the danger of the cable snapping and causing serious bodily harm. Perhaps great enough to rip the connection point out of the rafter and cause serious damage the rafter. The force needed to close the crack could be great. The connection point would need to be at the bottom of each rafter. I'm interested in closing the crack but am at a loss as to how to go about connecting a cable to the opposing rafters. The crack is about 1/16th of an inch wide. The engineer also suggested the option of attaching a cable to two opposing rafters and using a cable puller to attempt to pull the rafter together just enough to close or partially close the ceiling crack. He also suggested installing rafter ties which I am planning on doing. That should hopefully prevent any further spreading out. The structural engineer suggested laying another 2X4 over the joists in the affected area. I'd like to repair the crack in the ceiling. I had the old roof torn off last year and now there is just one layer of shingles so the excess weight should not a problem any more. The area above the crack does not have a 2X4 brace immediately over the attic joists. My roof had three layers of shingles bearing down and we believe this excess weight has over time caused the wall to be pushed out a fraction of an inch which has caused cracks in the ceiling. 2X4s are laid flat and nailed across the attic rafters to provide bracing against the outward force of the roof pressing down. Most roofs use attic joist that run parallel to the rafters but in my roof the attic joists are perpendicular to the rafters. After three visits from two different structural engineers I think the cause of the cracks has been identified. It's about five feet long, surrounded by hairline cracks and is about a foot from the the wall is lined up with the wall. Over the past few years a long crack has developed in my living room ceiling.
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