Skip to content

Roof Replacement Basics Explained

Replacing your roof is a big project, but when you know what to expect, you can approach it with total confidence. No matter where you live in the United States, the roof replacement process generally follows the same steps.

Woman holding phone with roofing calculator

Measure

Roofs measured by our roofing calculator in the United States

Estimate

Average roof replacement cost for an asphalt roof in the USA

Connect

Highly rated roofers nationwide

Home > Roof Replacement Basics

Initial Roof Inspection

Your roof replacement journey begins when you notice signs of damage, aging shingles, or leaks that just won’t quit. You call a roofing contractor—like Instant Roofer—to conduct a thorough inspection. During this visit, the roofer will:

  • Determine the size and shape of your roof
  • Check for underlying issues (such as water damage or structural concerns)
  • Provide an accurate cost estimate for the roof replacement

This information helps lay the groundwork for your project, giving you a clear sense of timing and budget.

Person inspecting a roof

Selecting Your Roofing Material

After you confirm that a roof replacement is in order, the next step is choosing the material. Modern roofing offers a wide array of options, including:

  • Dimensional (architectural) shingles for improved curb appeal
  • Wood shakes for a rustic, traditional look
  • Metal roofing for durability and low maintenance
  • Clay or concrete tiles for exceptional longevity and style
  • Solar Roof for the ultimate in durability while generating clean green energy.

Your location, budget, and design preferences all play a role in determining the best fit for your roof replacement.

Multiple styles of asphalt roofing
Home roof tops from the sky facing down

Get Your Free Instant Roof Estimate Today!

Removing Old Shingles

Before new materials can be installed, the crew must remove the existing shingles and underlayment. While it’s possible to place new shingles over old ones, that shortcut usually leads to issues down the line. A complete tear-off allows your roofer to identify any hidden damage and properly prepare for a successful roof replacement.

roof removal

Preparing the Roof Deck

With the old shingles gone, it’s time to fix any problems with the roof decking. This step typically involves:

  • Removing or hammering down protruding nails
  • Replacing damaged or rotted plywood
  • Installing a high-quality felt or synthetic underlayment

Taking the time to address these areas now ensures your roof replacement will stand strong for years, preventing leaks and future damage.

decking laid on roof with tar sealing the seams

Installing New Vents

Ventilation is a crucial part of any roof replacement. If your vents are broken or outdated, your contractor may recommend swapping them out for new ones. Some homeowners even add extra vents to boost attic airflow, reduce energy costs, and maintain a more comfortable home temperature—particularly beneficial in warmer climates.

Roof vents on a metal roof

Try Instant Roofer Today!

Adding Roof Flashing

Flashing is key to preventing water from sneaking under your new roofing materials. During the roof replacement process, roofers will install or replace flashing in critical areas such as:

  • Eaves, valleys, and ridges
  • Around chimneys, skylights, or vent pipes
  • Along roof edges or hips

In some colder climates, ice and water shield layers may also be added for extra protection against harsh weather. A waterproof sealant is applied around the flashing to ensure a leak-resistant finish.

Roof Flashing on a chimney

Laying Starter Shingles

Before the main shingles go down, the roofer will place a row of starter shingles at the edges and eaves. This extra layer fortifies high-risk areas that are prone to strong winds and moisture, setting a solid foundation for the rest of your roof replacement.

Asphalt Starter shingles

Installing the Main Shingles

Here’s where the transformation happens. Shingles are installed from the bottom up, overlapping each row to divert water. Each nail is positioned carefully so it stays hidden under the shingle above it. By the end of this phase, the biggest part of your roof replacement will be complete, and you’ll see your home’s new look begin to emerge.

Regular Asphalt Shingle being installed on a roof.

Adding the Ridge Vent and Caps

At the highest point of your roof, specialized ridge vents or ridge cap shingles are applied. This final piece of the roof replacement puzzle:

  • Allows hot air to escape the attic
  • Helps regulate indoor temperatures
  • Provides extra wind resistance

These final touches not only protect the roof’s most vulnerable area but also improve overall ventilation and home efficiency.

Roof vents on asphalt roof

Final Cleanup

Once the roof replacement is finished, the roofing crew will thoroughly clean up your property. Expect them to:

  • Remove tarps, dumpsters, and any large debris
  • Run a rolling magnet across the yard to collect stray nails
  • Leave your property looking just as neat as it was before

A quality roofing contractor will leave you with a spotless yard—and, of course, a beautiful, long-lasting roof.

roof final cleanup
Home roof tops from the sky facing down

Get Your Free Instant Roof Estimate Today!