Different Parts of a Standard Roof and their Functions

By Stacy Mellete

Knowing the basic parts of a standard roof and how they work can help you make more informed decisions.

As one reputable residential roofing installer in Tampa FL,  part of our job is to educate people. 

Basic Parts of the Roof

1. Rafters 

Rafters are frames that support the skeleton of the roof. They rest on the ridge and connect the wall plate of the external walls. Generally, they come in series, providing a base to support the external roofing components. 

Reminder: Always check the alignment upon installation of rafters. 

2. Decking Boards 

Decking boards or roof decking provides a level surface between the weatherproofing layers (coatings, coverings)  and the roof’s structural components (trusses and joints). 

Reminder: Opt for durable decking board materials like plywood, oriented strand board (OSB), tongue and groove, step sheathing and V- Rustic. 

3. Underlayments 

Underlayments are water-resistant barrier materials that support the roof deck. The primary function of residential roof underlayments is to prevent moisture buildup. 

Reminder: Leading roof manufacturers like GAF recommend using quality materials, such as fiberglass-reinforced underlayment. 

4. Covering 

Covering is the outermost component of the residential roofing system. The most common types of roof covering include asphalt, metal, concrete, and tiles. 

Reminder: Location is one of the most significant factors when choosing roof-covering materials. 

5. Flashings 

Flashings provide additional support in preventing roof leaks and clogged gutters. Common roof flashing materials include stainless steel and aluminum. 

Reminder: Metal sheet flashing could be your best option for roof flashing due to its durability.

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Our Roofing Solutions

Your roof has an important job to do to keep your home dry, but it can also be an impressive home feature.


Our stone coated steel roofing system is available in a wide range of styles including Tile, Shake, Slate, and Shingle, and in a variety of colors. We’ll help you to choose one that will fit your home’s style and your budget.


As the most-used roofing type across North America, asphalt strikes a balance between price and durability, with a life expectancy of up to 20. Shingles are available for those who want affordable, genuine slate roofing.


Tile roofs offer unparalleled value when cost per year of use is factored in. While upfront costs are higher, customers who choose a clay or concrete tile roof will enjoy the aesthetics and quality for a lifetime.


Metal roofs today come in a wide array of colors and finishes. Innovations in metal roofing technology have significantly enhanced the performance of metal roofs.

TPO Membrane

TPO can be installed to any scale with some of the world’s largest building utilizing TPO roofing systems – it comes in strips typically 8ft 10ft and 12ft wide that are heat welded on site.

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