Choosing the right electrical box for concrete walls requires understanding installation ease, fire rating, and capacity. This guide highlights five reliable PVC old-work boxes designed for retrofit projects, including outlets, switches, and GFCIs. Each option emphasizes durability, ease of installation, and compatibility with common wall materials. The table below offers a quick snapshot of the featured products to help you compare at a glance.
| Product | Brand | Capacity | Depth | |
|---|---|---|---|---|
| CycevSun 6 Pack Electrical Outlet Box Old Work 1 Gang | CycevSun | 14 cu in | Deep 2-3/4 in | Not specified |
| XGGYA Old Work Box, 1 Gang Deep | XGGYA | 14 cu in | 4-1/3 in L x 2-1/5 in W x 2-3/4 in D | ETL Listed |
| XIUTE 1-Gang PVC Old Work Box | YQXIUTE | 14 cu in | ~1 gang depth | ETL |
| Newhouse Hardware 1-Gang PVC Old Work Box | Newhouse Hardware | 14 cu in | Standard 1-Gang depth | Not specified |
| AIRTAK 1-Gang Old Work Box | AIRTAK | 14 cu in | 4.33″ L x 2.25″ W x 2.875″ D | ETL Listed; 2-Hour Fire Rating |
CycevSun 6 Pack Electrical Outlet Box Old Work 1 Gang
CycevSun’s Old Work Box offers a 14 cubic inch capacity in a deep 1-gang design, enabling versatile retrofits in pre-existing walls. Built-in clamps simplify installation without extra tools, reducing installation time in concrete-adjacent spaces. The 2-3/4 inch depth accommodates outlets, dimmers, GFCIs, and thermostats, making it a practical choice for upgrading electrical outlets in retrofit projects.
XGGYA Old Work Box, 1 Gang Deep
XGGYA’s plastic junction box features built-in fixing ears and a rotatable buckle to secure the box on the wall, supporting easy installation. With a compact 4-1/3 inch length and 2-3/4 inch depth, it resists loosening after installation and supports standard AWG wiring. Its ETL listing signals compliance with common safety standards, making it suitable for remodels and renovations in concrete-adjacent spaces.
XIUTE 1-Gang PVC Old Work Box
XIUTE’s 14 cubic inch PVC box is designed for simple, cost-effective retrofits. Weighing roughly 88g, the single-gang unit emphasizes insulation with a non-conductive shell, reducing grounding requirements. Its flange and adjustable installation label assist alignment in existing walls, while live hinges provide easy access to sheath cables and additional supports, supporting neat, efficient installations in concrete-block environments.
Newhouse Hardware 1-Gang PVC Old Work Box
Newhouse Hardware’s 1-Gang PVC Old Work Box is designed for remodeling tasks, accommodating non-metallic sheathed cable. The box is versatile for switch boxes, GFCIs, or duplex receptacle outlets, offering a reliable, durable solution for home improvements. Its plastic construction simplifies cutting and mounting in retrofit scenarios, particularly within concrete-adjacent walls where fire resistance and accessibility matter.
AIRTAK 1-Gang Old Work Electrical Outlet Box
AIRTAK combines safety and practical design in a 1-gang old-work box. With a two-hour fire rating, it emphasizes protection for electrical projects in areas where fire safety is a priority. The box supports quick renovations thanks to its straightforward installation design and compatibility with AWG16/14 wiring, ensuring a reliable retrofit in concrete-adjacent walls.
Legrand – Wiremold Starter Box
The Legrand Wiremold starter box provides a robust on-wall conduit and raceway solution. It’s positioned as a durable option for heavy-duty wiring in spaces where going behind tile or concrete isn’t feasible. While designed for Wiremold raceways, its box compatibility and fittings expand the possibilities for clean cable management in retrofit projects within concrete walls.
TOMSHIELE PVC Old Work Box, 2-Gang
TOMSHIELE’s 2-Gang Old Work Box provides a deeper 25 cubic inches of capacity for dual-control devices. Its high-quality PVC construction ensures durability in challenging environments, and ETL certification confirms adherence to safety standards. The deeper design accommodates two devices while maintaining a compact exterior footprint, benefiting renovations in concrete-anchored walls.
Buying Guide: Key Purchase Considerations
- Capacity and space: Choose a box with enough cubic inches to accommodate current devices and future upgrades. Deeper single- or multi-gang options can prevent overcrowding.
- Wall compatibility: For concrete walls, ensure the box is rated for retrofit (old-work) installation and supports required wall thickness and mounting methods.
- Fire rating and safety: If fire resistance is crucial (e.g., living spaces near combustibles), look for ETL-listed products and fire-rated boxes (two hours or as specified).
- Material and grounding: PVC (non-conductive) boxes simplify grounding in some installations, but verify local codes and device compatibility with your wiring.
- Installation features: Built-in clamps, fixing ears, adjustable flanges, and hinges can reduce installation time and improve alignment in retrofit projects.
- Device compatibility: Ensure the box accommodates the intended devices (outlets, GFCIs, dimmers, thermostats) and wiring gauges (AWG16/14/12, etc.).
- Fire and moisture considerations: For damp or high-moisture areas, ensure the box is rated for such environments and consider seals or gaskets where applicable.
- Aesthetics and finish: While often hidden behind devices, choose boxes with clean finishes and smooth edges to ease drywall finishing and trim installation in concrete walls.
In retrofit projects, selecting a PVC old-work box designed for concrete walls helps ensure a stable install, reliable electrical performance, and compliance with safety standards. The options above cover a range of needs—from compact 1-gang installations to deeper, two-gang configurations—while emphasizing ease of use, durability, and compatibility with common household wiring practices.