“Over Air Barrier” Electrical Plug Mounting Block Box

Over Air Barrier Electrical Plug Mounting Block – Code-Ready Installation

The Over Air Barrier Electrical plug box eliminates one of the biggest vulnerabilities in your exterior wall system—unsealed electrical openings. Traditional installations require a full box cutout through the sheathing, which compromises your air and moisture barrier. Builders often rely on spray foam, flashing tape, and complex sealing techniques that are labor-intensive and prone to failure.

This plug mounting block does things differently. It keeps the electrical plug box outside of the sheathing, with only a 3/4” hole for the wire. That small hole is easy to seal completely with standard exterior-grade caulking—no spray foam, no flashing, no mess.

Built to Protect, Designed to Simplify

By mounting directly to the sheathing—not a stud—you get more freedom to place outdoor plugs exactly where they’re needed. This also eliminates the guesswork of in-wall box placement and reduces installation time dramatically.

Ideal for exterior outlets, power access points, and GFCI boxes, the Over Air Barrier Electrical Plug Mounting Block is made from durable, weather-rated materials and is tested for use in wet locations. For enhanced ventilation, you can also add the optional rain screen spacer for rain-screen cladding systems.

Features and Benefits:

• Mounts outside the air/moisture barrier—no full wall cutouts

• Only a single 3/4” wire pass-through for complete seal

• No stud required- mounts directly to the sheathing

• Optional rain screen spacer for ventilated siding systems

• CSA/UL tested for wet locations

• Compatible with most standard outdoor plug configurations

• Saves time, reduces sealing mistakes

• Clean, reliable finish trusted by pros and DIYers alike

Product Specifications:

• Base Dimension: 5 1/2” x 6 1/2”

• Overall Dimension: 7 1/2” x 8 1/2”

• Accommodates Thicknesses: 5/8”, 3/4”, 1”, 1¼” (1.59cm to 3.18cm)

• Electrical Base: CSA/UL equivalent to 18 cu. in.

• ETL-rated for Wet Locations

At HandrailCovers.com, we understand that a great exterior isn’t just about looks—it’s about long-term performance. The Over Air Barrier Electrical Plug Mounting Block offers the smartest way to seal your siding system, with no compromises. Add it to your cart today and build better from the outside in.

Check out our other Siding Accessories