When architect Richard Renner spotted an old brick storefront for sale in a downtown district, he saw more than a vacant building. He envisioned a space that could serve both as his architectural practice’s office and as a residence for his family. What emerged after months of careful work was a remarkable rehabilitation that achieved LEED Platinum certification, the highest rating available from the green building certification programs that set the standard for sustainable construction.
The project demonstrates how existing brick buildings can be transformed into high-performance structures that meet modern energy standards. This article explores the key strategies used to turn an aging brick store into a model of sustainable urban living.
Structural Reinforcement and Building Envelope Upgrades
The original brick building had solid masonry walls that provided good thermal mass but lacked any insulation. The first priority was reinforcing the structural integrity of the existing shell while creating a continuous thermal barrier.
Roof Strengthening and New Slab Construction
The existing roof structure needed significant reinforcement to support the added loads from a vegetative green roof and photovoltaic panels. The team used a combination of steel beams and engineered lumber to increase load capacity without altering the building’s historic character.
- Installed steel reinforcement beams across the roof span to distribute loads evenly
- Added structural ties between existing masonry walls to resist lateral forces from the additional dead load
- Created a new concrete slab on grade after removing deteriorated flooring and contaminated fill material
- Incorporated radiant heating tubes within the slab pour for efficient space heating
Insulation Strategy for Masonry Walls
Insulating existing brick walls presents unique challenges because the masonry must remain able to dry to the interior or exterior. The solution involved installing rigid foam insulation board against the interior face of the brick walls.
- Cleaned and repointed all existing brick masonry to seal gaps and prevent air infiltration
- Applied a vapor-permeable air barrier membrane directly to the interior brick surface
- Installed continuous rigid polyisocyanurate insulation board, minimizing thermal bridging through framing
- Framed a new interior stud wall offset from the brick to create a service cavity for electrical and plumbing runs
- Filled the cavity with dense-pack cellulose insulation for additional thermal performance
This assembly achieved an effective R-value far exceeding code minimums while allowing the brick to dry properly. The approach aligns with sustainable construction methods that prioritize both energy performance and building durability.
Renewable Energy and Solar Integration
The roof became a major focus for energy generation. The southern exposure received a full array of photovoltaic panels sized to offset the building’s projected annual energy consumption.
Photovoltaic Panel Installation
The PV system was designed to maximize energy production within the constraints of the building’s roof dimensions and local solar exposure.
| Component | Specification | Purpose |
|---|---|---|
| Photovoltaic panels | Monocrystalline silicon, 240W each | On-site renewable electricity generation |
| Inverter system | Grid-tied microinverters | Conversion of DC to AC with module-level monitoring |
| Racking structure | Low-profile ballasted mounting system | Attachment without penetrating the roof membrane |
| Monitoring platform | Web-based energy tracking dashboard | Real-time performance tracking and fault detection |
The ballasted mounting system was particularly important because it preserved the integrity of the roof membrane underneath. Panels were tilted at an angle optimized for the local latitude to capture maximum annual solar radiation.
Vegetative Green Roof Installation
A portion of the roof area that was not occupied by PV panels received a vegetative green roof. This required only about three hours of labor for installation once the growing medium and sedum mats were in place.
- Applied a root-barrier membrane over the roof substrate to protect the waterproofing layer
- Installed a drainage mat to channel excess water toward roof drains
- Placed a lightweight engineered growing medium formulated for shallow roof applications
- Rolled out pre-grown sedum mats that establish quickly with minimal irrigation
The green roof provides stormwater management by retaining rainfall, reduces the urban heat island effect, and extends the life of the roof membrane by shielding it from UV radiation.
Mechanical Systems and Energy Efficiency Measures
The heating, ventilation, and air conditioning systems were selected to minimize energy consumption while maintaining excellent indoor air quality and occupant comfort.
High-Efficiency HVAC Design
The mechanical system combined multiple strategies to achieve exceptional performance.
- Installed a ground-source heat pump system using vertical boreholes for stable thermal exchange
- Incorporated an energy recovery ventilator to precondition incoming fresh air with exhaust air energy
- Used the radiant slab for primary heating, reducing the load on the forced-air system
- Added zoned temperature controls with occupancy sensors to avoid conditioning unused spaces
Air Sealing and Continuous Insulation
Beyond the wall insulation assembly, the team conducted extensive air sealing throughout the building envelope.
- Sealed all penetrations through the building envelope, including electrical boxes, plumbing pipes, and duct chases
- Installed continuous air barrier at the roof deck interface with masonry walls
- Applied spray foam insulation at rim joists and other transition areas where rigid foam could not achieve a perfect seal
- Conducted blower door testing to verify air leakage rates met Passive House-level targets
The combination of a tight envelope and high-efficiency mechanical systems reduced the building’s projected energy use by more than 60 percent compared to a conventionally constructed building of similar size. This level of performance is consistent with net zero energy design principles that aim to balance energy consumption with on-site renewable generation.
LEED Certification Process and Lessons Learned
Achieving LEED Platinum required careful documentation of every sustainable design decision made during the project.
Credit Categories Addressed
The project earned points across multiple LEED credit categories, reflecting the comprehensive approach to sustainability.
| LEED Credit Category | Key Points Earned | Strategy Used |
|---|---|---|
| Sustainable Sites | Urban redevelopment, brownfield remediation | Adaptive reuse of existing urban site |
| Water Efficiency | Rainwater management, efficient fixtures | Green roof retention, low-flow plumbing |
| Energy and Atmosphere | Optimized energy performance, renewable energy | PV array, ground-source heat pump, tight envelope |
| Materials and Resources | Building reuse, recycled content, regional materials | Preserved brick shell, locally sourced insulation |
| Indoor Environmental Quality | Enhanced ventilation, thermal comfort, daylighting | ERV system, radiant slab, operable windows |
Key Takeaways for Similar Projects
The Renner project provides several lessons for anyone undertaking a historic brick rehabilitation with sustainability goals.
- Start with the building envelope. The single most impactful investment is continuous insulation and air sealing, because every mechanical system benefit multiplies when the envelope performs well.
- Preserve existing masonry whenever possible. Brick buildings have embodied carbon embedded in their materials. Reusing the existing structure avoids the environmental cost of demolition and new construction.
- Plan the PV array and green roof together. Coordinating the location of panels and vegetative areas ensures optimal solar access and simplifies waterproofing details at the transitions.
- Document everything for LEED certification from day one. Credits for materials sourcing, indoor air quality, and construction waste management are much easier to track during construction than after.
- Consider the urban heat island benefit. A vegetative roof on a downtown brick building provides neighborhood-level cooling benefits that go beyond the building’s own energy performance.
This project demonstrates that sustainable building design and historic preservation are not opposing goals. With careful planning and attention to detail, an old brick structure can meet the most demanding modern environmental standards while retaining its original character and contributing to the vitality of the surrounding urban neighborhood.