Hairline cracks in the drywall joint are a pretty common issue in many homes, and not usually a sign that your home is in danger of collapse. It's more likely that they've occurred due to settling, ...

If the top of the tape is further down in the slab, the crack can appear jagged, but still relatively straight. Concrete slabs typically experience shrinkage of 1/8 inch for slab sections 20 feet ...