Installation Instructions
LESSCO AIR-VAPOR BARRIER BOX INSTALLATION INSTRUCTIONS
FOR ELECTRICAL CONTRACTOR
If you should experience an unforeseen problem, you can contact us at (920) 948-1120.
DOWNLOAD: LESSCO Cut Sheet

Install electrical box inside of the LESSCO® Box. Use hinge feature if needed.

Install wiring through the LESSCO® Box into electrical box.
- Attach the LESSCO® Air-Vapor Barrier Box to the wall or ceiling framing member.
- If the nailing configuration or size of the electrical box requires, cut the top and bottom of the new, improved LESSCO® Box where indicated. This allows the hinge action to take place. Then attach the LESSCO® Box as in step one.
- Install standard electrical box inside of the LESSCO® Box.
- NOTE: Steps #1 and #2 can be accomplished simultaneously by holding electrical box inside LESSCO® Box, then attaching electrical box to framing member.
- If the hinge action is being used, simply swing the outward portion of theLESSCO® Box away to provide more room to attach the electrical box.
- Make a small cut for wiring where indicated on the top or bottom of the LESSCO® Box. Make only one small cut for each wire. DO NOT make one large hole for 3 or 4 wires.
- Install wiring through the LESSCO® Box into electrical box. Complete wiring as usual.
- If the hinge feature is being used, DO NOT run the wire through the opening created by the cut made for the hinge option.
LESSCO AIR-VAPOR BARRIER BOX INSTALLATION INSTRUCTIONS
FOR AIR SEALING/INSULATION CONTRACTOR
If you should experience an unforeseen problem, you can contact us at (920) 948-1120.
DOWNLOAD: LESSCO Cut Sheet
- Seal completely around the wires with acoustical or silicone sealant.
- If the hinge option was used, the cut made at the top and bottom of theLESSCO® Box must now be taped shut with 3M Contractor’s Sheathing Tape.
- Insulate cavity as usual. Then install the continuous high quality air barrier.
- If using the Airtight Drywall Approach (ADA), gaskets are now attached to the flanges of the LESSCO AVB Box. Proceed to step #5.
- Cut air barrier at center of flanges of LESSCO® Box.
- Tape the air barrier to the flanges of the LESSCO® Box with a good quality, air barrier tape.
- Make sure the 3M tape is folded into the insides of the LESSCO® Box to create a long lasting airtight seal.
*3M blue 72 adhesive can also be used to seal the air/vapor barrier to theLESSCO® box, if desired.
- Make sure the 3M tape is folded into the insides of the LESSCO® Box to create a long lasting airtight seal.
- Insulate around the electrical box inside the LESSCO® Box. Your airtight installation is now complete.
- Apply finish wall or ceiling material as usual.