Should old roof be removed?

Can You Re-Roof Over Your Old Roof? - HomeTips

Roofing |
If any areas of the roof have become severely damaged, it's usually better to remove the old shingles and start from scratch. ... If you're going to add a roof on top of an old one, it's a good idea to remove any loose shingles and apply a new layer of 30-pound roofing felt before laying the new shingles.Dec 7, 2019

What is a normal roof called?

4 Common Roof Types: Asphalt Shingles | Angie's List

Tips for Choosing the Right Roofing Contractors
Homeowners have a variety of roof types to choose from, including slate, tile, metal and even solar. However, asphalt shingles remain the most popular choice for roofing — and for good reason.Sep 27, 2012

What is a roof made of?

Roof shingle - Wikipedia

Roofing |The Remodel Group ATL
Shingles are made of various materials such as wood, slate, flagstone, metal, plastic, and composite materials such as fibre cement and asphalt shingles. Ceramic roof tiles, which still dominate in Europe and some parts of Asia, are still usually called tiles.