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The golden ratio for roof pitch is 1:1.62. It’s simply a standard aspect ratio that home and building designers and architects use when deciding how steep a roof should be to maintain visual appeal. The golden ratio can apply to any home or structure with a visible roof that isn't considered a flat roof.

The cost to replace a roof averages around $9,200, and most people pay between $6,000 and $15,000. The size of your roof plays a major role in the total cost, but the most significant factor is whether you need new shingles placed over your old roof or a full replacement. The former is possible until you have three layers of roofing on your home, and it’s more affordable. A full replacement involves ripping off old layers of shingles, sometimes repairing the sheathing, and then laying down a new roof, which is the most expensive project.

There should be small gaps between your roof and the walls of your home, and other buildings. These small gaps let building materials shift, expand, and contract with weather and other outside forces, and they prevent moisture from wicking down walls from roofing and gutter systems. Without these strategic gaps, your home’s exterior and its finishes can sustain water damage, decay, peel, delaminate, and crack. However, there is a fine line between a smart gap and a problematic gap—all  gaps should be small, intentional, and covered or filled in with foam insulation to prevent pests from using them as access points.

No, cool roofs are not suitable for all climates. Cool roofs are very good at reflecting solar heat, so they’re suitable for homes in warm or hot climates. However, they’re not good at retaining heat, so they’re not suitable for homes in cold climates.