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Insulated cantilever floor - cavity insulation with 1 inch rigid insulation closure

Insulated cantilever floor - cavity insulation with 1 1/2 inch rigid insulation closure

Insulating Existing Floor Overhang

Guide describing how to upgrade a wall with a floor overhang (or cantilever) on an existing home by adding insulation (rigid insulating sheathing and/or closed-cell spray foam) and air-sealing.

Wrong – Cantilever is not blocked or insulated.

Publication Date

Fri, 10/28/2011 - 12:00

Cantilever floor with insulation and air blocking

Reference

Building America Best Practices Series - 40% Whole-House Energy Savings in the Cold and Very Cold Climates, Volume 12

Author(s)

Baechler Michael C,

Gilbride Theresa L,

Hefty Marye G,

Cole Pam C,

Love Pat M

Organization(s)

Pacific Northwest National Laboratory,

PNNL,

Oak Ridge National Laboratory,

ORNL,

U.S. Department of Energy,

DOE

Guide describing measures that builders in the cold and very cold climates can take to build homes that have whole-house energy savings of 40% over the Building America benchmark with no added overall costs for consumers.

Publication Date

Fri, 04/20/2012 - 12:00

Cover bottom of cantilever area with rigid foam insulation

Publication Date

Tue, 03/20/2012 - 12:00

Building America Energy Performance Brief: Insulating and Air Sealing Cantilevered Floors

Author(s)

Gilbride Theresa L

Organization(s)

PNNL

Publication Date

October, 2011

Case study describing the proper techniques and steps in insulating and air sealing a cantilevered floor, as well as the consequences for failing to do so properly.

These floor joist bays have been properly air sealed with caulked rigid foam insulation

Right – Cantilever has been properly insulated, air sealed, and cavity has been blocked.

Publication Date

Fri, 10/28/2011 - 12:00

Air seal the top, bottom, and sides of a cantilevered floor cavity and ensure that insulation is in full contact with all sides without voids.

Publication Date

Fri, 10/28/2011 - 12:00

Wrong - Tub or shower floor is not insulated and air-sealed with a solid barrier material between the floor joists and the tub. Plumbing pipes shouldn't be located in a cantilever.

Publication Date

Wed, 07/07/2021 - 12:00

Floors: Above Unconditioned Basement, Vented Crawlspace, Cantilevered Floors, and Floors above Garage, Code Compliance Brief

New language in the 2015 IECC allows different installation of insulation in floors over unconditioned spaces.

Wind Washing

Guide describing wind washing and how to prevent it.

Cantilevered Floor

Guide describing how to air-seal and insulate a cantilevered floor.

New Whole-House Solutions Case Study: Tindall Homes: The Legends at Mansfield, Columbus, NJ

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

April, 2012

Case study describing a new construction building project of 20 luxury homes in northern New Jersey that were more energy efficient than ENERGY STAR and met the 50% energy savings requirements of the federal tax credit for new homes.

Ducts in Interstitial Floor Framing

Guide for designing and installing interior ducts in an interstitial floor cavity in new and existing homes.

Cantilevers, Technical Bulletin F2

Author(s)

Advanced Energy

Organization(s)

Advanced Energy

Publication Date

March, 2002

Information sheet containing images and descriptions of cantilevers.

Air sealing at cantilevered manufactured fireplace assembly

DWG

PDF