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While two-layer torch down roofs are easier to install than three-layer roofing, it is best not to DIY the installation. Torch down roofs require expert knowledge of the application process to get it right the first time and prevent leaks or poor craftsmanship, not to mention that roof work can be dangerous.

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.

A spray foam roof costs an average of $6,000 to install, making it one of the most affordable flat roofing options available. Costs can increase if you have a complex roof design with many roof vents or have a roof that’s larger than average. While up-front costs are relatively low, keep in mind that ongoing maintenance and repairs tend to be more expensive than you’d see with other flat roof materials.

In some cases, yes, you can put a second roof layer over architectural shingles, but it depends on your home’s structural stability and the local building codes where you live. Architectural shingles are thicker and heavier than standard asphalt shingles, so you may need structural reinforcement or a structural engineer’s inspection before proceeding. Additionally, some building departments don’t allow for two roof layers, regardless of the roof type. You should ask a professional if ripping the old roof off before installing the new one is the best option for you.