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The exact weight of a bundle of shingles depends on the shingle type, manufacturer, and other factors. It can weigh anywhere between 45 and 800 pounds.

Gaps between tiles are necessary to help with weatherproofing, allow for thermal expansion, and increase wind resistance. In general, a small gap no larger than 3 millimeters wide will encourage proper drainage and limit cracking. Beyond that, tiles should overlap a minimum of 3 inches, except at the eaves where they should extend to the center of the gutter.

If you’re choosing between a roof overlay and a tear-off, opt for a tear-off and full roof replacement instead of a roof overlay if possible. The cost savings from an overlay can easily be eclipsed by repair costs, the effects of structural damage from the additional weight, and needing to replace your roof sooner than expected. A full replacement will last longer and is less likely to need damage repaired over time.

Green roofs are incredibly long-lasting. Some have life spans of up to 40 or 50 years. Since the roofs help to protect the rest of your home's roofing system, they can also extend the life of your existing roof.

Regular maintenance and inspections will help you get the most out of your green roof and ensure it lasts as long as possible.