Just going to throw this out there:
When unexpected catastrophies come up, most people don't have an extra $8,000 laying around. Landlord or not. I was a renter for many years and know a few people that own rental properties. Most rentals are an investment and not a money maker. The tenant usually covers the cost of the mortgage, insurance and taxes.
If you have the repair money in savings, and that is a BIG IF~
maybe offer to pay the repairs in return for $8000 worth of rent and an extra month or two free. Of course, get everything in writing and notarized.
If you like the home and have not had any other problems with the landlord, and do not want to move, it could be an option.
I am not sticking up for the landlord or justifying his reaction to the problem. Just offering another possible solution.