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Yes, but it won't be as effective as installing it as part of a new roof because it won't be as water-resistant. However, a drip edge installed after the fact is better than no drip edge at all.

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 minimum recommended slope for a porch roof is 1/4:12, which means 1/4-inch of rise every 12 inches of run. Slopes of 3:12 and 4:12 are more common and provide faster drainage for runoff. Make sure to choose a pitch that’s appropriate both for the climate in your area and the type of roof material you install. Hire a roofer if you need help determining what the right roof pitch is.

Underlayment is required by building code, so any roof installed without it is technically against code. The underlayment acts as the second layer of defense against water, so installing a roof without underlayment means a much higher risk of roof leaks. You’ll have the best chance of avoiding roof leaks if you install drip edge flashing covered by underlayment, and then install your roofing material over that.