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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.

Metal roofs do not inherently leak more than shingle roofs; when properly installed, they are generally less likely to leak. Asphalt shingle roofs are more susceptible to leaks due to factors like wind uplift, damage from extreme weather, moss growth, and ice dams. Over time, asphalt shingles also lose their protective grit, which reduces their waterproofing capabilities. In contrast, metal is a more resilient material that stands up better to heavy precipitation and high winds. However, metal roofs can develop leaks if they are poorly installed, have improperly sealed fasteners, or experience issues from thermal expansion. For this reason, professional installation and regular maintenance are crucial to ensure a metal roof's longevity and superior protection against leaks.

The easiest type of roof to build is a shed-style or lean-to roof, which features a single sloping plane from one side of the building to the other. Unlike a gable roof with two sides meeting in the middle, a shed roof's single slope makes the construction process more straightforward. The rafters are typically single pieces of wood that span the distance, often without the need for additional supports.

Some homes, like those with flat roofs, may not have eaves at all. Some contemporary-style homes also lack eaves, although many may have abbreviated eaves to divert water and protect the walls and foundation. Homes without eaves often have specific types of gutters affixed directly to the edge of the roof to provide adequate drainage.