What Does A New Roof Consist Of?

Investing in a new roof is a substantial undertaking that involves more than simply installing new shingles. A roofing system is a complex assembly of multiple components, each of which serves a distinct purpose in protecting your home from the elements, providing insulation, and ensuring proper drainage. 

A new roof is a multilayered structure designed for durability and performance, from the decking and underlayment to the shingles and flashing. 

This article will explain what a new roof consists of, highlighting the various components and their purposes.

What Does A New Roof Consist Of?

Installing a new roof is a complex process that involves multiple components and steps. Here’s a breakdown of what a new roof typically consists of, from the materials used to the installation process:

Components of a New Roof

  • Roof Deck: This is the stratum upon which all other components are installed. It’s usually made of plywood or oriented strand board (OSB).
  • Underlayment: This is a water-resistant or waterproof barrier that is installed directly on the roof platform. It may be constructed from felt, synthetic materials, or rubberized bitumen.
  • Drip Edge: This is a metal flashing installed at the edges of the roof to help regulate the flow of water away from the fascia and protect the underlying roofing components.
  • Ice and Water Shield: Ice and Water Shield is an underlayment used in frigid climates to prevent the formation of ice dams. Typically, it is affixed at the roof’s eaves, valleys, and around roof penetrations such as vents and chimneys.
  • Roofing Material: This is the outermost stratum of the roof and can be composed of asphalt shingles, metal, slate, or tile, among other materials.
  • Flashing: Flashings are thin metal parts installed to prevent water from entering a structure through an angle or joint, such as around chimneys, vent pipes, and valleys between roof sections.
  • Ventilation: Roof vents or ridge vents are installed to enable moisture and heat to escape the attic, extending the roof’s life and enhancing energy efficiency.
  • Ridge Cap: This material is applied to the roof’s ridge or apex to provide the final layer of protection from the elements.
  • Gutters: Even though gutters are not technically part of the roof, they are frequently installed or replaced alongside a new roof to ensure proper drainage.

Installation Process

  • Removal of Old Roof: If necessary, the old roofing material is removed all the way to the roof platform.
  • Inspection and Repair of Roof Deck: The roof deck is inspected for damage, and any decayed or damaged boards are replaced.
  • Installation of Drip Edge and Underlayment: Drip Edge and Underlayment are installed in order to protect the roof from water damage.
  • Application of Ice and Water Shield: Ice and Water Shield is applied if necessary to prevent the formation of ice dams.
  • Installation of Roofing Material: Beginning at the bottom and working upwards, the selected material is installed.
  • Installation of Flashing: Flashing is installed around roof penetrations and roof junctions.
  • Ventilation: New or existing vents are installed, replaced, or cleansed.
  • Ridge Cap Installation: The ridge cap is installed on the peak of the roof.
  • Cleanup and Final Inspection: All debris is removed, and the new roof is inspected to ensure it meets all building codes and quality standards.

Additional Considerations

  • Local Building Codes: Compliance with local building codes is essential, and permits may be necessary.
  • Weather: Installation should be scheduled during favorable weather conditions to avoid complications.
  • Warranty: Understand the warranty terms for both materials and labor.
  • Cost: The price can vary greatly based on the materials used, the complexity of the roof, and the local labor rate.
  • Professional Installation: Due to the difficulty and significance of proper installation, hiring professionals for this task is generally advised.

You can make informed decisions throughout the process by understanding what a new roof consists of, from selecting materials to understanding the installation steps.


A new roof consists of multiple components, each of which contributes to its overall efficacy and durability. Even though the visible shingles or metal panels are the most obvious components, the underlayment, decking, ventilation systems, and flashing are just as vital. 

Understanding what goes into a new roof enables homeowners to make informed decisions, such as selecting the right materials and comprehending the scope of a roofing endeavor. 

Read More: How To Keep Snow From Falling Off Metal Roof?

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