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Spray Foam Interior Insulation for Existing Foundation Walls

Guide describing how to insulate an existing foundation wall by adding spray foam insulation to the interior side of the wall.

Right - Workers installed rigid foam on the floor and the sill plates of these pre-cast, pre-insulated concrete wall panels to provide a continuous layer of insulation under and around the not-yet-poured basement floor slab.

Publication Date

Thu, 09/30/2021 - 12:00

Vapor-permeable mineral wool insulation is installed on the exterior side of the sill beam during an exterior wall retrofit to allow the sill beam to dry to the outside

Sill Plates (2)

Publication Date

July, 2015

Video describing how to insulate and air seal sill plates.

Water Managed Existing Sill Beams and Sill Plates

Guide describing how to insulate the sill beam or sill plate on the exterior side in a way that allows drying to the exterior, as part of an exterior wall upgrade.

Right – This wall is constructed with the sill plate overhanging the top of the foundation wall so that when rigid foam is installed on the exterior of the foundation wall, its surface will align with the surface of the wall sheathing.

Publication Date

Mon, 09/30/2019 - 12:00

Waverly Home Addition | Exterior Cladding Details

Publication Date

February, 2014

Video describing the exterior cladding details of a residential home addition project.

Air Sealing Retrofits: Reduce Air Leakage at the Sill Plate with Canned Spray Foam

Publication Date

December, 2022

Author(s)

Louie Edward

Organization(s)

Pacific Northwest National Laboratory,

PNNL

Video showing air sealing of the sill plate behind the baseboard in an existing home with canned spray foam to stop air leakage at the base of the wall.

This exterior wall retrofit permits drying to the exterior of a sill plate installed on an untreated irregular foundation wall

Publication Date

Mon, 07/01/2013 - 12:00

This exterior wall retrofit permits drying to the exterior of a sill plate installed on an untreated flat foundation wall

Publication Date

Mon, 07/01/2013 - 12:00

Conceptual air sealing strategy - lower wall section

DWG

PDF

New Whole-House Solutions Case Study: Tom Walsh & Co., New Columbia, Portland, OR

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

February, 2013

Case study describing a new construction building project of 20 homes that earned HERS scores that represent greater than 50% energy savings in heating and cooling over the 2004 IECC.

New Whole-House Solutions Case Study: Schneider Homes, Inc., Village at Miller Creek, Burien, WA

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

February, 2013

Case study describing new home construction in the marine climate that achieved 50% savings over the 2004 IECC.