Best Outlet Box Options for Concrete Walls and Surfaces
Answering the question most buyers have: when installing electrical outlets on concrete walls or surfaces, choose weatherproof or surface-mounted boxes designed to anchor securely to concrete. This guide highlights five top products that work well with concrete walls or exterior installations, explaining who each is best for and why. Whether you need a wall-surface box, a weatherproof outdoor box, or a concrete-floor fit that still keeps your wall tidy, these options cover common concrete setups and offer practical installation considerations.
The following quick-reference table summarizes the five products most relevant to concrete-wall outlet box needs. It highlights target use, best-for scenarios, and notable considerations at a glance.
- Arlington FLBC4500 Concrete Floor Box — Best for new concrete floors and easy mud cover integration indoors/outdoors.
- Leviton Surface Mount Backbox (42777-1WA) — Best for wall-surface installations where a traditional wall box isn’t feasible.
- Sigma Engineered Solutions 14250 Weatherproof 1/2″ 3 Hole 1-Gang Box — Best for outdoor or wet-location concrete walls.
- BELL PSB37550GY Single-Gang Weatherproof — Best for weatherproof, conduit-ready wall or box openings on concrete structures.
- Wiremold BW2-D On-Wall Raceway Box — Best for extending power on concrete walls with integrated raceway and outlets.
Arlington Concrete Floor Box
Product name and brand: ARLINGTON FLBC4500 Concrete Floor Box. Features include a low-voltage divider and mud cover; constructed from plastic and designed for concrete installation. This box is intended for new concrete installations, offering a practical solution where outlets must reside flush with finished concrete surfaces. Who it’s best for: builders or remodelers installing outlets in concrete floors or slabs where surface routing and mud covers simplify clean, durable installations. Cautions: ensure compatibility with your conduit and cover requirements; verify that the mud cover and divider align with your planned wall-to-floor transition.
Why this was selected: It directly targets concrete floor applications, providing a structured enclosure for outlets that avoids traditional wall boxes. If your project involves embedded outlets in concrete surfaces, this model offers a purpose-built solution with mud cover compatibility.
Leviton Surface Mount Backbox, Single Gang
Product name and brand: Leviton Surface Mount Backbox, Single Gang, 1.89″, 42777-1WA, White, Plastic. Features include surface mount capability, breakouts to match common surface mount raceway systems, and a 1.89-inch depth. Best-for scenarios: interior walls where embedding a traditional box isn’t practical, or when surface raceways are already in use on a concrete or masonry wall. Caution: as a surface-mount option, it won’t be fully recessed; consider finishing gaps for a clean appearance on concrete walls.
Why this was selected: this model directly fits the “outlet box for concrete wall” concept by enabling surface mounting on concrete or masonry surfaces without altering the wall structure. It accommodates common raceways, which is useful in retrofit projects or spaces with existing surface wiring.
Airmont Outlet Box Kit, 4×4”
Product name and brand: Outlet Box Kit, Includes 4×4” Welded Metal Electrical Box, 2 Tamper Resistant 20 Amp Duplex Receptacles, 4×4” Duplex Receptacle Cover, 16 Knockouts, Green Grounding Wire and Screw. Features include a welded metal box, tamper-resistant outlets, full duplex configuration, and a grounding provision. Best-for scenarios: projects requiring a sturdy, plug-in-ready 20-amp duplex configuration with a 4×4-inch box in exposed or semi-exposed concrete areas. Caution: metal boxes require proper shielding and grounding in wet locations; ensure weatherproofing if used outdoors or in damp areas.
Why this was selected: this kit combines a robust metal box with duplex receptacles in a single package, which is helpful for concrete-wall setups needing multiple outlets with a clean cover and ground continuity.
Wiremold Extension Box and Raceway, On-Wall
Product name and brand: Wiremold Metal Raceway, Extending Power, On-Wall, Outlet + Box, White, BW2-D. Features include a raceway system with an integrated outlet box, designed to extend circuits and cabling without disturbing drywall or insulation. Best-for scenarios: inside-cabinets or on concrete walls where modernization requires adding power and data access along a surface rather than embedding new boxes. Caution: this option relies on surface installation; finishing work may be needed to integrate with concrete aesthetics.
Why this was selected: for concrete-wall environments where you want to minimize wall alterations, a raceway-plus-outlet approach offers a neat, modular solution that blends with surface treatments and masonry textures.
Legrand Wiremold NM2-D Outlet Box
Product name and brand: Wiremold – The Brand Pro’s Trust. Included: 1 Legrand Wiremold raceway, white outlet box for small surface nonmetallic raceway systems. Best-for scenarios: quick, surface-mounted power and data upgrades on concrete walls without heavy remodeling. Caution: only as robust as the raceway system itself; ensure load and environmental exposure suit a lightweight plastic box in wet or outdoor use.
Why this was selected: this option emphasizes a practical on-wall raceway pairing, offering a simplified way to add outlets or connectors on concrete walls while keeping the setup modular and accessible for future changes.
BELL Weatherproof Single-Gang 1/2 or 3/4 in. Outlet Box
Product name and brand: BELL PSB37550GY Single-Gang Weatherproof 1/2 in. or 3/4 in. Threaded Outlets, 2 in, Gray. Features include durable PVC construction, suitability for 1/2 in. or 3/4 in. conduit, and inclusion of 3/4 in. closure plugs and reducer bushings. Best-for scenarios: outdoor or damp-zone concrete walls where weatherproofing and conduit adaptation are needed. Caution: ensure the external enclosure remains weatherproof at all joints; sealant or gaskets may be required for long-term exterior exposure.
Why this was selected: this box is designed for weatherproofing on concrete surfaces, offering flexibility for conduit sizing and outdoor or damp-location use with a straightforward closure set.
Buying Guide
What matters when choosing an outlet box for concrete walls or surfaces?
- Location and exposure: indoor concrete walls vs. outdoor or damp spaces; choose weatherproof or gasketed designs for exterior use.
- Mounting method: surface mount vs. in-wall or embedded options; surface-mount boxes are easier for retrofit work on masonry.
- Box size and capacity: single-gang vs. multi-gang; ensure conduit entry points and knockouts match your installation needs.
- Material and durability: plastic boxes are lighter and corrosion-resistant; metal boxes offer rigidity for heavy-use areas.
- Grounding and safety: ensure grounding provisions are present and compliant with local electrical codes, especially for concrete and exterior installations.
- Compatibility: verify the box works with your outlet type (duplex, tamper-resistant, weatherproof) and any raceway systems you plan to use.
Frequently Asked Questions
- What is the best type of outlet box for concrete walls? – A weatherproof or surface-mount box designed for concrete or masonry surfaces is typically best, depending on whether the box will be indoors or outdoors.
- Can I install standard wall boxes on concrete walls? – Standard recessed wall boxes require masonry or wall modifications; surface-mount or weatherproof options are often more practical on concrete surfaces.
- Are weatherproof boxes necessary for exterior concrete walls? – Yes, weatherproof boxes reduce moisture ingress and improve safety in outdoor installations.
- Do I need special grommets or seals with concrete boxes? – Gaskets or closure plugs help seal joints; use them when the installation is exposed to moisture or dust.
- Is it better to use one larger box or several small boxes on a concrete wall? – It depends on outlet demand and routing; multiple smaller boxes can reduce clutter and simplify wiring runs in tight spaces.
- Do these options support tamper-resistant outlets? – Several listed kits include tamper-resistant duplex outlets; verify the product specs before purchase.