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Mansard roofs provide more attic space or living space on the interior than many other styles, and they offer a classic appearance and old-world charm to any home. They also often have multiple windows on the lower hip, providing ample natural light and ventilation. 

On the other hand, they’re more expensive to install and replace due to their complexity and rarity, and the low slope of the upper hip means that heavy snowfall can be an issue. Additionally, they’re more prone to leaking than many other roof styles.

The lifespan of a torch down roof depends on the number of layers installed. A single-ply system typically lasts between 10 and 15 years, while a multi-layer system with two or three layers can last from 15 to 25 years. Although a multi-layer option may be more expensive upfront, it provides a longer service life. Warranties often reflect this, with about 12 years for a one-ply system and 15 years for a two-ply system. For context, this lifespan is shorter than other common roofing materials like wood or asphalt shingles, which typically last 20 to 30 years, with high-quality versions lasting up to 50 years.

Furring strips (also called wood stripping) are not always necessary for a metal roof installation, but they are highly recommended and may be required by local building codes or the roofing manufacturer's specifications. There are several key reasons to use them:

• Energy Efficiency: Furring strips, made of wood or metal, create an air gap between the metal panels and the roof deck. This acts as a thermal break, reducing heat transfer into your home and improving overall energy efficiency.

• Moisture and Condensation Control: The air gap allows for better airflow, which helps prevent moisture buildup and condensation under the metal panels.

• Structural Support: They provide a solid, even frame to which you can attach the metal roofing panels.

It is especially important to use furring strips when installing a metal roof over existing shingles. Without them, the roof surface can be uneven, and you will experience greater solar heat gain.

Shingle roofing can last anywhere from 15 to 50 years, depending on the type and quality of shingle, your local climate, and how well you maintain your roof. If you live in an area that sees extreme weather, like strong winds, hail storms, or hurricanes, the average life span of a shingle roof will often be on the shorter end, especially if you choose a more affordable roof shingle that isn’t designed to persist through extreme weather.