What are the pros and cons on adding a second layer of shingles as opposed to tearing off and replacing the first layer? -- J. & H.R., Tulsa. One layer only. It is the norm in the insurance industry ...

Q: My garage roof has shingles that are worn and weathered. Under what conditions would it be advisable to lay a second layer of shingles over the existing layer? I would assume there are cost savings ...

Q: Our home is 23 years old and has a pitched roof with common shingles. The roof does not leak, but the shingles are starting to curl and are just plain ugly. We have received different opinions on ...