Building code allows 24-inch on-center spacing for roof trusses. However, you can install them on 12- or 16-inch centers to handle large loads or other exceptional circumstances. In cases such as covering a wide span or supporting alternative roofing materials, where a structural engineer needs to evaluate or create a design for your trusses, the plans will indicate the spacing. 

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.

No, a metal roof will not make your house hot. In fact, metal roofs help keep your home cooler by reflecting heat instead of absorbing and transmitting it inside. Metal also has high thermal conductivity, which means it gains and loses heat quickly. While the sun may heat the metal, the roof rapidly transfers that heat back into the air rather than retaining it. This reflective property can lead to energy cost savings of up to 40%, as your cooling system won't need to work as hard to maintain a consistent indoor temperature.

If you live on the West Coast or anywhere with the threat of wildfires, you likely want to take steps to fireproof your home. Besides waterproofing and life span, rubber roofing also is noted for being fire resistant. Consult a professional roofer for details on what type of roofing would be best for you if fire resistance is a priority.