Austin, Texas has experienced rapid population growth over the past decade, and with that expansion comes demand for residential architecture that works for extended families. The Red Oak Residence, completed in 2022 on a 0.29-acre site, addresses this need through a 13,016-square-foot compound organized around a butterfly roof and interconnected water features. The design, by LaRue Architects with interiors by Britt Design Group, shows how contemporary architecture can serve multiple generations on a compact urban lot. Much like the engineering lessons drawn from the Austin dam failure, careful planning and site analysis shaped every decision on this project.
Butterfly Roof Design and Structural Considerations
The butterfly roof is the most striking structural feature of the Red Oak Residence. This roof type slopes inward from both sides toward a central valley, creating a V-shaped profile that resembles an inverted gable. Water drains through internal gutters at the center rather than running off the edges, which requires careful waterproofing and slope calculations. The butterfly roof on this residence mimics the movement of water that encircles the property, tying the architecture to the site hydrology. This approach to roof geometry shares DNA with the Trail Creek mountain residence dual-gable design, where roof forms respond to the surrounding landscape rather than imposing a generic shape.
Structural Load and Drainage Engineering
A butterfly roof presents specific engineering challenges. The central valley must handle concentrated water flow during rain events, requiring larger downspouts and secondary overflow drains than a conventional sloped roof. For a 13,016-square-foot structure in Central Texas, where rainfall can exceed 3 inches per hour during thunderstorms, the drainage system must handle roughly 24,000 gallons per hour during peak downpours. Structural engineers calculate roof joist spans to handle both the dead load of roofing materials and the live load of standing water if drains become blocked.
Roof Material Selection for Inward Slopes
Standing seam metal roofing is the standard choice for butterfly roofs because it provides continuous waterproofing across long panel runs without exposed fasteners. The metal surface also reflects solar radiation, reducing cooling loads for the interiors below. For the Red Oak Residence, the roof material was selected to complement the surrounding landscape palette while meeting the stringent waterproofing requirements of the inward-sloping design.
| Butterfly Roof Factor | Conventional Roof | Butterfly Roof |
|---|---|---|
| Drainage direction | Outward to gutters | Inward to central valley |
| Gutter type | External (exposed) | Internal (concealed) |
| Water flow rate during 3 in/hr rain | ~15 gal/min per downspout | ~40 gal/min at valley |
| Overflow protection | Secondary gutters | Scuppers in valley wall |
| Roof material compatibility | Any type | Standing seam metal preferred |
| Typical maintenance frequency | Annual | Semi-annual (valley debris) |
Multigenerational Casita Layout and Site Planning
The three multigenerational casitas at the Red Oak Residence are separated from the main house by water features, pathways, and landscaping rather than by long hallways or separate structures pushed to property edges. This arrangement allows each household unit to maintain privacy while staying visually connected to the central compound. Examples of this separation-with-connection strategy appear in other contemporary residential projects, including the Harris residence design approach where primary and guest wings are separated by transitional spaces rather than walls.
Casita Configuration and Square Footage Allocation
Each of the three casitas at the Red Oak Residence contains its own living space, bedroom, bathroom, and kitchenette. The combined square footage of the casitas accounts for roughly 25 to 30 percent of the total 13,016 square feet, leaving the main house as the central hub for shared activities. This allocation works well for multigenerational households where grandparents, adult children, or guests need independent living quarters without full separation from the family core.
Key design parameters for a multigenerational casita layout include:
- Separate exterior entrance so occupants can come and go without passing through the main house
- Private bathroom with step-in shower for accessibility as residents age
- Kitchenette with microwave, small refrigerator, and sink for independent meal preparation
- Dedicated HVAC zone so temperature preferences do not conflict between generations
- Visual and acoustic privacy through building orientation and landscape buffers
Site Density and Floor Area Ratio
The floor area ratio for the Red Oak Residence exceeds 1.0, meaning the building footprint is larger than the lot area when spread across multiple stories. Austin zoning regulations in this area typically permit FAR values up to 2.0 for residential properties, so the design stays within code while maximizing usable space. Landscape Architect Garden Design Studios integrated the water features and pathways to create the feeling of a larger property despite the tight urban lot.
Water Features and Landscape Integration
Water encircles the casitas and main house at the Red Oak Residence, functioning as both a visual amenity and a spatial organizing element. Aqua Pools designed the water features to mirror the movement patterns of natural creeks, with varying widths and depths that create different sensory experiences around the property. This integration of water as a design element parallels the approach seen at the Saari Leonard residence modernization, where landscape and structure work as a unified composition.
Water Circulation and Filtration Systems
A residential water feature of this scale requires mechanical filtration and circulation comparable to a small swimming pool. The pumps must move water through the entire network of channels at a rate that prevents stagnation while staying quiet enough not to disrupt conversation or sleep. For the Red Oak Residence, the water system operates on a closed loop with biological filtration that supports aquatic plants and fish, turning the water features into a functioning ecosystem rather than a purely decorative element.
| Water Feature Component | Residential Pool (typical) | Red Oak Residence |
|---|---|---|
| Total water volume | 15,000 – 25,000 gallons | ~40,000 gallons (channels + pools) |
| Pump flow rate | 60 – 80 GPM | 120 – 150 GPM |
| Filtration type | Sand or cartridge | Biological + mechanical |
| Water heating | Solar or gas heater | Passive solar (shallow channels) |
| Maintenance schedule | Weekly chemical check | Weekly + seasonal plant care |
The pathways that connect the casitas to the main house are surfaced with natural stone that matches the site geology. Landscape Architect Garden Design Studios specified local limestone with a thermal finish for slip resistance near water edges. The paths are wide enough for two people to walk side by side, typically 4 to 5 feet, which encourages social interaction during the short walk between buildings.
Material Selection for Contemporary Residences
The material palette for the Red Oak Residence was chosen to withstand Central Texas climate conditions while maintaining a refined appearance. Glass, stone, and metal dominate the exterior surfaces, with the extensive glazing oriented to capture views of the water features while limiting solar heat gain. This approach to material selection reflects principles found in other contemporary projects such as the Kreiger Residence modern design-build project, where material performance dictated aesthetic choices.
Glass Performance for Large Residential Windows
The butterfly roof design creates opportunities for floor-to-ceiling glazing at the ends of each wing, where the roof slopes upward and opens the view. For a 13,016-square-foot residence, the total glass area can exceed 2,000 square feet. Specifying low-E coated, double-pane insulated glass with argon fill keeps the U-factor below 0.30, which meets Energy Star requirements for the Austin climate zone. Solar heat gain coefficient values between 0.25 and 0.35 prevent the extensive glazing from turning the interior into a greenhouse during Texas summers.
Structural Glazing and Frame Systems
Large glass panels require structural frames capable of supporting wind loads without visible deflection. For the Red Oak Residence, aluminum storefront systems with thermal breaks provide the necessary structural performance while maintaining slim sightlines. Each glass panel is supported by a concealed framing system that appears to float the glass, reinforcing the contemporary aesthetic of the design.
Interior Space Planning for a 13,016-Square-Foot Residence
Designing interiors for a residence of this scale requires a different approach than standard residential planning. Rooms must be proportioned to feel occupied and intentional rather than cavernous. Britt Design Group addressed this through a combination of furniture-scale architectural elements, strategic ceiling height changes, and material transitions that break large volumes into human-scaled zones. The lessons from designing smaller family homes apply here in reverse: where a small home must feel larger, a large home must feel intimate.
The dining room, kitchen, and great room are arranged along the central axis of the main house, with the butterfly roof creating a dramatic ceiling volume over the shared spaces. Interior finishes use a restrained palette of white oak flooring, limestone wall surfaces, and matte-black metal accents. This consistency across the main living areas prevents the visual fragmentation that can make a 13,000-square-foot home feel disjointed.
- Dining room: seats 10 to 12 with sideboard storage for formal dinner service
- Kitchen: double islands with prep sink on one and seating on the other
- Great room: sunken conversation pit centered on a linear fireplace
- Bedroom wings: each casita and main suite positioned for private views of water features
The Red Oak Residence demonstrates how contemporary mountain home design principles translate to an urban compound setting. Deep overhangs, extensive glazing, and a direct connection between interior and exterior spaces create a living environment that responds to its climate and site. For architects and builders working on multigenerational projects, the key takeaways from this Austin residence are the integration of water as a spatial organizer, the structural demands of butterfly roof construction, and the material discipline required to make a large home feel cohesive rather than overwhelming.