My agent says I can't underinsure. Or maybe I can but it would have to be a whole different policy and he'd strongly recommend against it, as it would only pay for a fraction of the roof for example.
you normally have to insure for 80% of the full replacement value.
there's problem #1. what is the correct value?
you can shop 5 companies and get 5 different values. you really need an appraisal to determine what it is and normally the company will accept that
here in NY I have a company using $300 a Sq ft. some $400, some $600, some $700, and asshole Chubb up around $1200
i always say the true value is someplace in the middle
the reason being the companies insist on over insuring property. its keeps them out of law suits for shortages.
then they collect the premium knowing they will never pay that much out unless its a total loss like in LA
total losses the have no choice but to pay the limits
roofs are another issue. Many are starting to cover roofs on actual cash value basis so no replacement cost
I see this more on the commercial side.
they'll deduct a crazy amount from the settlement based on age, materials, wear and tear. you'll owe Mr Roofer a nice shiny penny when he gets done with it.