These guys are good; period. I had a leak around my chimney and I have a slate roof. Looking at the inside of the attic, I could see this leak had been an issue for many years. My neighbor recommended GF Sprague so I called them and a guy named Bob Scribner came out to my house. After doing a complete home inspection, I actually thought it took too long, Bob told me that he would have a price for me within 2 days. I got the quote, and told GF Sprague to get working. They fixed the roof and the chimney. This was last summer, and since then I have not seen any water, or staining in the attic next to the chimney at all. I positively recommend Sprague for roofing and chimney work.