He may be an expert on slate roof's, but that would be it in my opinion. A guarantee doesnt mean anything when it still leaks and gets everything soaked over and over. What about the water damage to my floor and my furniture each time. After paying him $500 for a small roof repair 6 months ago, he has had to come back four times now. It still leaks. He must be as disgusted about coming back, as I am as disgusted at calling him again, because he came into our driveway about 75 mile an hour in that old truck just blowing dust everywhere. He doesnt even knock on my door, just gets up on the roof, then leaves at about 75 miles an hour. Unfortunately, my friend told me last week, that she had the same problem with him and would never call him again.