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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.

16-gauge galvanized steel staples with a minimum crown of 15/16 inches or 24 millimeters are occasionally used to install shingles. However, most shingle manufacturers or residential building codes don’t recommend staples as a roofing fastener. Roofing nails are preferred in most cases, especially in areas that get a lot of heavy wind.

While you technically can add a roof over shakes or shingles, it’s not a good idea. Roofing over existing roofing creates a moisture barrier underneath the new roof and since the trapped material is wood, you can expect a moisture problem. While you could get away with installing a new roof over asphalt or steel, wooden roofs should be removed, new underlayment installed, and the new roof installed over that. Also, the extra weight would add strain to your roof structure.

A well-maintained tile roof can last anywhere from 40 to over 100 years, with its exact lifespan depending on the material and level of care. Proper maintenance, which includes keeping the roof clean, free of debris, and performing routine repairs for any cracked tiles, is crucial for longevity. The lifespan varies significantly by tile type:

• Clay, terracotta, and slate tiles are highly durable and can last over 100 years.

• Concrete tiles typically last from 30 to 100 years.

• Metal tile roofs generally last between 40 and 70 years.

• Composite tile roofs have a lifespan of 20 to 50 years.

Be aware that maintenance for a tile roof can sometimes be more expensive than for an asphalt roof.