US Patent #'s
4,757,158
5,834,692
Lessco Air-Vapor Barrier Box for Green Construction
Developed by an American home-builder for the American Green building market!
Lessco Air-Vapor Barrier Box for Green Construction

Cold air infiltration/warm air exfiltration occurs through electrical boxes in exterior walls and in ceilings. This leakage creates higher heat loads and warm air exfiltration can also carry water vapor that can condense in the wall or attic cavity creating rotting action or mold growth
Lessco Air-Vapor Barrier Box for Green Construction

The LESSCO® Air-Vapor Barrier Box, properly installed, can eliminate these leaks; creating a more energy efficient, healthier and more comfortable home!

Lessco Air-Vapor Barrier Box for Green Construction

  1. The LESSCO® Box is made of thicker & stronger polyethylene to resist cuts & tears during installation. The rigid construction also makes the LESSCO® Box easier to handle & install.

  2. The LESSCO® Box has a unique hinged feature (Patented) that allows easy installation of virtually any standard electrical box.

    This allows the electrician to add just one item to his inventory instead of 4 additional airtight electrical boxes for airtight construction, taking up less space and helping to keep his inventory costs down.

  3. The LESSCO® Box is only INSTALLED by the electrician and SEALED by the air sealing contractor thus relieving the electrician from any liability for damage or mold growth associated with air or moisture leakage.

  4. The LESSCO® Box DOES NOT have to be installed "perfectly square" with the finished wall material, on the framing member, to insure an airtight installation

  5. The LESSCO® Box protects the seal made around the wires. The electrician cannot destroy that seal while pulling on the wires during the finish wiring process.

  6. The LESSCO® Box is sturdy & reinforced making it capable of withstanding the pressure needed to make a complete seal with the air vapor barrier material.

  7. The LESSCO® Box allows inspection and verification of a complete seal with the air vapor barrier material BEFORE the wall is closed. The LESSCO® box DOES NOT GAMBLE that the installation of finish wall materials will complete the seal with the interior air vapor barrier material.

  8. The LESSCO® Box does not rely on sealants or glue for installation or sealing and therefore cannot fail after the wall is closed and the caulk or sealant fails.

  9. The LESSCO® Box does not have a flange or air vapor barrier material in contact with the electrical box that can be destroyed by the drywallers’ router thus destroying the airtight integrity of the installation.

  10. If the LESSCO® Box is poorly installed or a mistake is made during installation and a leak is detected during a blower door test or by the homeowner during a cold, windy, winter day, the repair is QUICK, EASY and INEXPENSIVE.

    1. Remove the outlet/switch plate.
    2. Drill a 1/4" hole through the wall finish material next to the electrical box.
    3. Simply inject the LESSCO® Box with foam (i.e. Great Stuff or Handi Foam) to seal the leak.

      NOTE: THE ELECTRICAL BOX CANNOT BE FILLED WITH FOAM
      AS THIS CONSTITUTES A FIRE HAZARD AND IS AGAINST
      CODE

    4. Replace the outlet/ switch/fixture cover which also covers the 1/4" hole.
      Result: CUSTOMER COMPLAINT IS EASILY SOLVED

  11. The "LESSCO® Box Advantages" clearly make the cost of the LESSCO® box a worthwhile, convenient and cost effective addition to to all Green home building or remodeling projects!

The LESSCO® Air-Vapor Barrier Box conforms to the new airtight electrical box building code in Wisconsin and Minnesota.

The LESSCO® Air-Vapor Barrier Box has a large interior work area...

6-1/2 x 7-1/2 x 2-7/8 for easy installationLessco Air-Vapor Barrier Box for Green Construction

Lessco Air-Vapor Barrier Box for Green Construction
Lessco Air-Vapor Barrier Box for Green Construction Lessco Air-Vapor Barrier Box for Green ConstructionThe new and improved LESSCO® Air-Vapor Barrier Box has incorporated a unique "hinge" feature. In the past, certain electrical sidewall and ceiling boxes were difficult or impossible to use with the LESSCO® Air-Vapor Barrier Box. The new unique hinge design makes virtually all current electrical boxes compatible with the new and improved LESSCO® Air-Vapor Barrier Box.
Lessco Air-Vapor Barrier Box for Green Construction

Easy to follow instructions (click to preview) are included with each carton of LESSCO® Air-Vapor Barrier Boxes to make installation fast and easy.

Any questions??  Don't hesitate to contact us!

Lessco Air-Vapor Barrier Box for Green Construction
Lessco Air-Vapor Barrier Box for Green ConstructionTo find a distributor near you or for more information use our handy information request form. We'll get back to you as soon as we can!
The LESSCO Air Vapor Barrier Box

Proven effective in Air Tight, energy efficient Green building since 1985!

LESSCO® Low Energy Systems Supply Company, Inc.
W1330 Happy Hollow Road
Campbellsport, WI 53010
Phone: 920 533-8690/FAX: 920 533-3306

E-Mail LesscoAirtight@gmail.com