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Last update on March 09, 2026

Roofing questions, answered by experts

While you technically can add a roof over shakes or shingles, it’s not a good idea. Roofing over existing roofing creates a moisture barrier underneath the new roof and since the trapped material is wood, you can expect a moisture problem. While you could get away with installing a new roof over asphalt or steel, wooden roofs should be removed, new underlayment installed, and the new roof installed over that. Also, the extra weight would add strain to your roof structure.

Yes, roof ridge caps are a necessary part of your roof system. Your roof ridge cap is at the peak of your roof, where two slopes of your roof meet. Roof ridge caps seal the seam and help protect your roof from water and debris, and because they’re pre-bent and thicker, they’re more suited to the job than regular roof shingles, which can break when bent.

Whether replacing the entire roof or just installing roof shingle replacements in small areas, always pull up the old roof shingles. While you can technically put new roof shingles (but not other roof materials) over old shingles, this can add weight strain to the roof and prevent the new shingles from securing properly to the roof.

You may become so frustrated with the look of moss on your roof that you contemplate whether to clean or replace your roof. Fortunately, you don’t have to go as far as replacing it. After cleaning the moss, you can use a chemical solution to keep it away. For further protection, trim branches that overhang the roof, as fallen seed pods and leaves on the roof allow moisture to collect, encouraging moss growth. Consider adding zinc-coated flashing to the roof, too. As rain washes across the zinc, it leaves zinc particles behind that inhibit moss growth.

Asking questions before hiring a roofer ensures you receive the best quality for your investment upfront and in the long term. Roofers with minimal experience, unfamiliar with local building codes, or minimal access to great materials can lead to both structural and financial problems down the line. You should also be able to easily communicate and collaborate with your roofer during extensive projects.