Now, alittle more information. Are these sags widespread or just in one or two isolated places?
If this is widespread, then you need to act pretty fast. These slats are rated to just take so many PSI's.
If this is isolated, then I would consider goint into the attic and seeing about shoring up those affected slats. This can be done by bracing.
This will buy you some time to look around and decide when and who will make the necessary repairs.
I would again, get you insurance company out with cameras and documentation on the situation so that you will not be out any money.
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