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Copper roof strips offer better coverage and more damage protection than zinc roof strips. Although both deter moss and algae growth, copper also offers UV protection. Zinc strips require more strips than copper to cover the roof’s surface area, which means more holes in your roof. Copper strips are also more flexible and last longer than zinc strips.

The best material to sheath a roof will depend on your budget and if you require the strength of more robust materials. For most homes, the added strength is unnecessary, and oriented strand board, or OSB, makes sense. It’s inexpensive and robust enough for most roof types. Another popular but slightly more expensive option is plywood.

Asphalt shingles have varying thicknesses across the length, so failing to stagger shingles from one row to the next will leave you with bulges and bumps if the thicker sections stack on top of each other. Not only is this unappealing, but it increases the risk of water intrusion. Stagger each new row by 6 inches to avoid this issue.

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.