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Hail is unlikely to damage a tar and gravel roof because the hailstones will hit the protective gravel rather than your delicate roof membrane. A tar and gravel roof is the most resilient flat roof option, which means it’s the best one for areas that see hail, fallen tree debris, and blown debris from intense winds.

Skipping the installation of a drip edge or gutter apron can lead to significant water damage. Without this component, water is more likely to seep under roofing materials or leak behind gutters, damaging the fascia, soffits, siding, and even the interior of your home, such as the attic. Over time, this moisture can cause rot, mold, and deterioration. In colder climates, a missing drip edge also increases the risk of ice dams, which can lead to expensive repairs. A drip edge is an essential part of a roof's drainage system, and some local building codes may even require its installation to protect the home from water damage.

Thatched roofs last for between 30 and 50 years in most cases, which is longer than most asphalt roofs. However, getting that life span from your thatched roof requires more maintenance than you’d need for most other materials, including fireproofing, brushing, cleaning, and rethatching as the material gets worn down. You’ll also need routine inspections to ensure you’re not at risk of leaks.

The placement of snow guards depends on the individual roof, but typically snow guards are placed between 12 and 18 inches from the eaves, though they can be placed as close as six inches and as far as 24 inches from the eaves. A roofing professional can assess the roof and potential snow loads to determine the best placement.