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The proper specifications for furring strips can vary, so you should always consult the roofing manufacturer's guidelines or your roofer. However, general recommendations are as follows:

• Thickness: Furring strips are typically 1 to 1-1/2 inches thick, meaning standard 1-by or 2-by lumber works well. In areas with extreme winds, a thinner strip may be preferred to limit how much air can get under the roof and cause uplift. A thicker strip can add slightly more insulation but will also increase installation costs.

• Spacing: The recommended spacing for furring strips is between 12 and 24 inches apart on center. Proper spacing is crucial for ensuring good airflow, adequate drainage, noise reduction, and better energy efficiency. The ideal spacing can depend on the roof's pitch and the specific type of metal roofing being installed.

The placement of snow guards depends on the individual roof, but typically snow guards are placed between 12 and 18 inches from the eaves, though they can be placed as close as six inches and as far as 24 inches from the eaves. A roofing professional can assess the roof and potential snow loads to determine the best placement.

If your roof is nearing the 20-year mark in age, you probably should start worrying about the roof’s longevity. If you don’t know the age, it may be time to figure out who installed your roof, so you can estimate the age accurately. You then can make plans to pay for the upcoming roof replacement. You also can learn how to inspect a roof yourself to look for signs of damage that may indicate a need for a replacement.

Metal roofs do not inherently leak more than shingle roofs; when properly installed, they are generally less likely to leak. Asphalt shingle roofs are more susceptible to leaks due to factors like wind uplift, damage from extreme weather, moss growth, and ice dams. Over time, asphalt shingles also lose their protective grit, which reduces their waterproofing capabilities. In contrast, metal is a more resilient material that stands up better to heavy precipitation and high winds. However, metal roofs can develop leaks if they are poorly installed, have improperly sealed fasteners, or experience issues from thermal expansion. For this reason, professional installation and regular maintenance are crucial to ensure a metal roof's longevity and superior protection against leaks.