Comparing Rafters and Trusses in Roof Construction

Dmytro Morokhovets
Jun 16
3 min read

Framing the Roof: The Heart of Structural Design

When building or replacing a roof, one of the first—and most important—decisions involves selecting the right support structure. For homeowners and builders in Santa Monica, CA, the choice usually comes down to rafters or trusses. Though both serve the same purpose—to support the roof—they differ significantly in design, installation process, cost, and long-term impact on your home’s flexibility. Understanding these differences is key to choosing a solution that balances function, aesthetics, and budget.

At Economy Roofing, we’ve worked with both systems extensively and guide clients toward the best fit for their needs. Let’s take a closer look at how these options compare.

What Are Rafters?

The Traditional Approach to Roof Framing

Rafters are long wooden beams that slope from the ridge of the roof down to the walls. Often called “stick framing,” this traditional construction method is assembled on-site, allowing for more customization. This makes rafters ideal for complex or unique rooflines, such as those found in custom homes or historical renovations.

However, rafter-based systems are labor-intensive and require skilled carpenters. This results in a longer installation timeline and higher labor costs—factors homeowners must consider when budgeting their project.

Pros and Cons of Using Rafters

Pros:

Greater flexibility in attic space (ideal for vaulted ceilings or storage)
Easier to modify later (for dormers or skylights)
Customizable for non-standard designs

Cons:

More expensive due to labor and material usage
Longer build time
Higher risk of human error during installation

What Are Trusses?

The Pre-Engineered Solution

Trusses are prefabricated triangular structures built in a factory and delivered to the job site ready for installation. They are made from smaller lumber pieces joined with metal connector plates, and they distribute loads efficiently across your walls. Trusses are extremely popular in modern residential construction because they offer speed, consistency, and cost-effectiveness.

Since trusses are manufactured under controlled conditions, they are less prone to warping or measurement errors. Their uniform design helps keep the roofing project on schedule—an essential factor for tight timelines.

Pros and Cons of Using Trusses

Pros:

Lower installation costs
Faster project completion
Factory precision ensures consistency

Cons:

Less attic space and flexibility
Difficult to modify after installation
Limited architectural creativity

Which System Is Better for Your Project?

Consider Your Budget and Timeframe

For those who prioritize efficiency and cost savings, trusses often make the most sense. If your roofing job is part of a larger remodel or on a tight deadline, prefabricated trusses can help streamline the entire process.

On the other hand, if you’re building a custom home or looking to create a functional attic space, rafters give you the design freedom to achieve that vision. They’re also preferable for locations where architectural appearance or historical preservation is a concern.

Think About Long-Term Use

Choosing between rafters and trusses isn’t just about cost—it’s also about how you intend to use the space under your roof. Do you want a vaulted ceiling, an attic bedroom, or storage? Rafters provide those options. Trusses, while strong and economical, tend to limit attic usability due to their webbing.

Expert Advice Makes All the Difference

With so many factors to weigh, it’s crucial to work with an experienced contractor who understands the structural implications of each system. Brands like Polyglass and Owens Corning offer roofing materials that work seamlessly with either approach, ensuring durability and performance regardless of the framing method you choose.

For homes in Santa Monica, CA, Economy Roofing provides detailed consultations to help homeowners select not only the right materials, but also the right structural solution for long-term value and functionality.

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