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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.

Venting a gas water heater out of the roof is preferable in most cases. Heated exhaust gases naturally rise, so a vertical vent pipe is efficient. If you’re trying to vent through a pipe exiting a wall, the angle of the pipe may be more horizontal than vertical, making the venting system less effective. If you go through a wall, you may need to add a fan to ensure a successful expulsion of the gases outdoors.

If you’re building the roof trusses yourself, which isn’t recommended, it will be more affordable than buying pre-built trusses. Trusses cost more because they use the same amount of material, but you’ll also be paying for the labor, as well as the delivery to your home. However, if you’re having a contractor build the roof for you, then trusses will be less expensive, as the labor costs to build roof framing on-site will cost more.

Building an A-frame roof falls under the category of constructing a steep roof. While its structure is relatively simple, its height and requirements for more materials than a shallow roof design can increase its cost significantly. Expect prices for building an A-frame roof to hover around average to slightly above average.