• Mark Forbes

Understanding Commercial Roofing Components

Understanding Commercial Roofing Components

When you need to repair or replace your commercial roof, you’ll probably come across some roofing system terminology that’s unfamiliar to you. Fear not! Here’s a brief description of three common components of most low-slope commercial roofs. Chances are, your current roof is constructed using these three components.


Roof Deck

The roof deck serves as the substrate that the commercial roofing system is installed over. Roof decks are made of a variety of materials, including:

  • Wood

  • Metal

  • Standard concrete

  • Lightweight insulating concrete

  • Tectum

  • Poured gypsum

Insulation/Cover Boards

Most roofs decks have layers of insulation installed over the deck that are attached with adhesives or mechanically attached.


Cover boards are then installed over the insulation. Cover boards provide protection from impacts and punctures. Some cover boards provide an ANSI/UL 790 Class A fire rating. This rating is often required in roofs that require higher fire resistance.


In some cases, a commercial roofer may install new cover boards over an existing roof before installing a new roofing system.


The insulating efficiency of the insulation/cover board is noted in the material’s R-value. A higher R-value means the insulation package is a more efficient insulator, which reduces your energy costs.

Roofing Materials

The roof membrane or coating is the final roof component that is installed. It’s the part of the roof you see when you look at your finished roof.


The type of roofing material used depends on the specific needs of the project and in some cases the preference of the customer.


About United Materials in Denver, Colorado

For nearly 99 years, United Materials has installed high-quality commercials roofs in Denver and throughout the Rocky Mountain West. Our commitment to craftsmanship, cost control and excellent return on investment results in roofs that meet our customers’ needs and expectations.


Contact us today to learn about our complete line of roofing installation, maintenance and repair services.


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