Architectural Curves in Glendora: The Rainbow Drive Arched Glulam Project

Architectural Curves in Glendora: The Rainbow Drive Arched Glulam Project

Perched above the sprawling valley in Glendora, California, the Rainbow Drive Residence stands as a masterclass in custom residential engineering. This project highlights the growing trend of utilizing mass timber to create dramatic, organic rooflines that complement the natural topography of a site. By moving away from standard flat planes and embracing uniformly curved beams, the homeowners have created a private sanctuary that is as distinct as the view it overlooks.

The Goal: A Unique Roofline for a Panoramic View

The vision for the Rainbow Drive project was centered on maximizing the connection between the interior living space and the vast Southern California landscape. The client required a structural solution that could facilitate an expansive and sloping roof system without the need for excessive internal supports.

To achieve this, the design utilized long span Glulam beams that curve in harmony with the residence’s unique floor plan. These beams interlock with a complex network of purlins and girders, forming a rigid yet graceful skeleton that defines the architectural character of the home.

Engineering the Arch: Three Distinct Radii

Achieving a uniform look across a non-linear roofline requires meticulous fabrication. One of the primary achievements of the Rainbow Drive project was the production of 19 arched Glued Laminated beams, each engineered to meet specific structural and aesthetic demands.

Technical Precision

The complexity of this residential build stemmed from the variation in the timber members:

• Three Distinct Inside Radii: Rather than using a single curve template, the beams were fabricated with three different radii to accommodate the shifting pitch of the roof.
• Variable Dimensions: The 19 beams spanned a myriad of different widths, depths, and lengths, ensuring each piece fit its specific location within the interlocking grid.
• Structural Integrity: These custom curves were engineered per the customer’s architectural plans to ensure they could handle long span loads while maintaining their graceful profile.

Wood Specifications: Aesthetic Douglas Fir

Because the beams remain fully exposed to view within the residence, material selection was paramount. Architectural Grade Douglas Fir was the clear choice for several reasons:

1. Visual Quality: Architectural grade timber is sanded smooth and minimizes knots or surface imperfections, making it ideal for high end residential interiors.
2. Finish Versatility: Douglas Fir offers a beautiful natural grain but also provides ease of paint or seal application, allowing the customer to match the timber to their specific interior palette.
3. Cost Efficiency: Compared to exotic hardwoods, Douglas Fir provides the necessary structural strength and aesthetic appeal while remaining cost effective for large scale residential applications.

Glu-Lam Sales Services: Managing the Curve

The path from a blueprint to a curved beam perched on a Glendora hillside is paved with technical coordination. Glu-Lam Sales acted as the vital link in this process through:

• Comprehensive Estimation: Providing accurate material takeoffs for 19 unique curved members.
• Detailed Profile Shop Drawings: We produced drawings that clearly illustrated each individual curve profile, ensuring the manufacturer and the onsite crew were in total alignment.
• Delivery Coordination: Managing the logistics of transporting long span, radiused beams to a residential site requires precision timing and specialized handling, all of which were managed to ensure a smooth installation.

Project Snapshot

Are you planning a commercial or educational renovation in Southern California? Contact our team today to discuss your Architectural Grade Glulam needs.