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Generally, the term “rolled roofing” refers to MSR (mineral surface roll) roofing. This type of roofing is similar to asphalt shingles but comes in a roll that’s unraveled and installed over your roof deck. There are many types of rolled roofing, including TPO, EPDM, and modified bitumen roofing (aka torch down roofing).

Metal roofs have a reputation for being very noisy, but with proper installation and adequate installation, metal roofs aren’t much noisier than shingle roofs. Some types and gauges of metal roofing provide more sound dampening, and added insulation or a thicker underlayment can also help muffle noise.

Technically a flat roof can be raised but it’s extremely expensive and there would not be much of a point. Most homeowners raise the roof in their homes to access the space between their existing ceiling and the roof but flat roofs don’t have this space. Therefore, you can raise a flat roof, but it involves heavy structural modification.

You can technically put new roof sheathing over old, but it isn’t recommended. Firstly, it isn’t hard to remove sheathing. Secondly, when you install new over old, you trap whatever moisture is in the older layer. This can cause problems later on, especially if you have a humid house. Another reason not to add new over old is the weight factor. Finally, when you cover an old layer, you lose the ability to inspect it for damage, rot, or mold.