Best to seek a public adjuster before yo even seek to turn in a claim such as that. Insurance companies could think you have some eminent danger of collapse and want to non renew you before something happens.
Unfortunately, I'm going to have to be brief because, for some odd reason, Trulia's answer window and my computer are having problems. So here are you answers, very quickly.
Cracking in the concrete is not necessarily "sinking" but could be simply poor drainage around the 'on-grade' slab foundation that is being pulled apart by the expansive soil beneath the home. Texas, like California and many parts of the West, suffers from "Adobe" soil that is "expansive" (meaning, it holds water and "grows") and the result is visible and sometimes prominent cracking in the slab foundation. Unless Mesquite also has a high water table under the soil, the ground is probably rising (not sinking) in some areas and pulling laterally in others.
As the others have already noted, call either a foundation expert or structural engineer to help you. In most cases--at least here in California--unless the situation is gravely severe (in which case, we "jack up" the building), foundation or slab cracks can be repaired as simply as correcting drainage and epoxy filling the cracks.. However, only an expert can guide you in what is needed for the home.
Grace Morioka, SRES
Area Pro Realty
San Jose, CA
Worth the little bit of cost to know exactly what is the problem. It could be something that was recently done near your property that has caused your problem. They'll be able to tell you what the problem is.
It's like feeling ill and not seeing a doctor or not going for the tests... Find out the problem and you'll know your solution.
Good luck. I hope it all works out to be less than what you may think...
Good luck to you!
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Once you have done that, or if you have already done that, you should then have an estimate for correcting the problem.
If, indeed, the foundation is "sinking".........you really will need to do whatever you can to correct it.
Maybe someone from Texas can help you figure out a way to get some kind of loan to correct this......but first you need to determine exactly what it is you're dealing with.
Unfortunatley, in my opinion, ths is not something you can ignore.
Has the concrete just cracked, or has it moved up and down? Some small cracks may not be a big deal, but shifting usually is. I would have a foundation company look it over and get a repair cost. It may not be as expensive as you fear. Or maybe, it is worse. You will only know once you have it checked out by those who can tell for sure.