It should. You should request a policy review with your agent. It has to be stated in the policy what is and is not covered.
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DO review your policy with your agent. Sewer Backup is typically EXCLUDED from most homeowner's insurance. It CAN be added to a homeowner's policy. Have you read your policy?
Yes, if you bought that as a rider. No if you did not.
NOPE
Yes it normally does.
No
Sorry but homeowners insurance does not pay for preventative replacement of a sewer line. This is an item that would be considered maintenance. Sorry this is not what you want to hear but that's the way it is.
Damage must be due to a covered cause for the damage to be claimed on your homeowners insurance. I cannot think of any way damage to a sewer could be from a covered cause.
No, an HO-3 policy typically does not cover sewage backup. Standard homeowners insurance primarily protects against damage from certain perils, but sewage backup is generally considered a separate risk. Homeowners can often purchase additional coverage or a rider specifically for sewer backup to protect against related damages. Always check your specific policy details for coverage options.
If your renters policy covers Sewer Backup then it will cover damage to personal property.
Inside your home or outside and did you bother to READ your policy?
If your policy contains sewer back up coverage and business owned property coverage. The policy should according to its terms and coverages cover your claim. http://calcocommercialinsurance.com
Yes.
I cannot think of any cause for a sewer line damage being caused by something that would be covered by a homeowners policy. It is probably maintenance and not an issue for your home insurance.