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If the bay window extends beyond your existing roofline, you must add a roof or a small “skirt” to divert storm water and prevent water damage. The window roof can match your existing house roof, or be finished with copper or other decorative materials. Most bay windows have a roof with complete flashing regardless of their placement to prevent leaks into the home.

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.

Spray foam roofs don’t stand up well to impact, so they won’t last as long as something like a tar and gravel roof and other flat roof materials in areas where extreme weather is common. Due to the reduced durability, you’ll also need more frequent maintenance and repairs for a spray foam roof, and those costs will add up over time. Spray foam roofs are relatively uncommon, so you may also struggle to hire a roofing contractor who can install one.

Copper roofs last an average of around 100 years, making it one of the longest-lasting types of roofs. It’s significantly more expensive than an asphalt shingle roof, but it also lasts three to four times as long, providing great value for the money. You can extend the life of your copper roof by carrying out routine maintenance, like scheduling annual cleaning and roof inspections.