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Yes, an underlayment is required for metal roofs, especially when installed over an indoor residential living space. This underlayment acts as a protective barrier between the metal roofing and the roof deck. Common materials include tar, asphalt felt, or woven synthetic polymers. Depending on local building codes, existing shingles in good condition may also suffice. A quality underlayment is crucial as it provides protection against water intrusion, improves energy efficiency through insulation, helps absorb sound, and ultimately extends the lifespan of your roof.

The best roof replacement type depends on your budget and your particular climate, as well as your personal aesthetic. But in general, asphalt shingles are the best roof replacement type for homeowners looking for durability at a budget-friendly price. Asphalt shingles are the most common roofing material—cost-effective, easy to install, lightweight, and the perfect choice for handy homeowners.

Some people prefer to use connectors consisting of galvanized metal to replace the birdsmouth cuts on the rafter board. Common names for these metal pieces include hurricane ties and variable-pitch connectors. Making birdsmouth cuts is more cost-effective than purchasing these connectors for each rafter. However, because making large birdsmouth cuts to accommodate extra-wide exterior walls can weaken the rafter, a connector may be the better option in some cases.

Depending on the type of damage your roof shingles have, you may be able to simply repair them without having to replace them. However, if there are more than a few to repair, replacement is likely the easier option. You may only need to replace a few of them. Repair shingles by applying roofing sealant directly under the shingle's damage and then directly over it.