Strip and install new roofs
Be careful. Liability insurance for roofers is pretty significant. And rightly so, because if their work leaks, they're liable for damages and repairs to other parts of the structure. I've seen roofers get slapped with claims for hundreds of thousands of dollars on one single job. Also workers comp insurance for roofers carries one of the highest rates in residential construction. If you fall off your friend's roof (or if you have a helper helping you and they get hurt), or you/they drop a hammer on someone's head, who pays for the hospital bill?
Also, in most if not all areas, if you get caught by the town doing a roof without a permit and without insurance, or without state registration/license, you get fined pretty hard. And with construction as slow as it is, the inspectors in my area are openly out on the prowl, looking for unpermited work.
These are significant little mines in the minefield that is the construction industry, and not to be taken lightly.
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