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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.

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.

In some cases, yes, you can put a second roof layer over architectural shingles, but it depends on your home’s structural stability and the local building codes where you live. Architectural shingles are thicker and heavier than standard asphalt shingles, so you may need structural reinforcement or a structural engineer’s inspection before proceeding. Additionally, some building departments don’t allow for two roof layers, regardless of the roof type. You should ask a professional if ripping the old roof off before installing the new one is the best option for you.

A new roof may improve insulation and ventilation problems that can lead to ice dams, but it’s not a solution for preventing them. All roofs are susceptible to the conditions that cause ice dams, so it’s best to invest your money into insulation and gutter management solutions rather than a new roof if you don’t need a replacement yet.