BASC Search | Building America Solution Center

Right – The knee wall is properly insulated and air sealed.

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Wrong - Insulation does not fill double wall cavity

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Frame, insulate, and air seal the walls of the skylight shaft as you would an exterior wall

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Hot Spot: Closed Crawlspace - Installing Wall Insulation

Video

Video from Home Innovation Research Labs on installing different insulation types in a closed crawlspace foundation.

Double-stud wall with spray foam and cellulose insulation

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Right - Ladder blocking allows insulation to be installed in exterior walls at interior-exterior wall intersections.

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Blown fiberglass insulation fills netted wall cavities

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Concrete masonry crawl space wall with exterior insulation

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Vented crawl space with concrete walls and insulated ceiling

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Insulated header made of one piece of plywood aligned with exterior wall, with room for insulation to inside

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Right - This concrete basement wall is insulated on the interior with spray foam insulation; sill detail are shown.

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Right – Fiberglass batt insulation fills the walls while the floor joists above are insulated with spray foam insulation to both insulate and air seal this transition space.

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Stud Walls With Continuous Exterior Insulation for Factory Built Housing

Case Study

Case study describing a panelized construction method for stud walls with continuous rigid foam insulation.

Right - The poured concrete basement walls are insulated along the inside with 2.5 inches of extruded polystyrene insulation.

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Rigid Foam Board Interior Insulation for Existing Foundation Walls

Video

Video describing how to properly insulate crawlspaces.

Right – The basement of this cold-climate home is insulated along interior walls with 2 inches of foil-faced rigid foam; finished basement walls also have a 2x4 interior wall insulated with R-19 blown-in fiberglass insulation and a poly vapor barrier.

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Field Energy Performance of an Insulating Concrete Form (ICF) Wall

Reference

Research study evaluating the dynamic heat transmission characteristics through two identical Insulating Concrete Form (ICF) wall assemblies in Ottawa, Canada.

Right - Potential locations for basement insulation in new construction, slab insulation should always be underneath, with walls insulated (a) inside, (b) outside, (c) sandwiched inside, or (d) inside and outside of walls.

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The walls of this home are filled with R-23 blown cellulose insulation.

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Assembly Sequence for Concrete Wall with Interior Foam Spray Insulation

Video

Video animation showing an assembly sequence for a concrete basement wall with interior spray foam insulation.

Assembly Sequence for Concrete Crawl Space Wall with Exterior Insulation

Video

Video animation showing an assembly sequence for a concrete crawl space wall with exterior insulation.

Rigid insulation is installed on the exterior side of the flat foundation wall

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Right – Unfaced batt insulation completely fills the wall cavities.

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This assembly for above-grade or below-grade garage walls in any climate zone uses a hybrid of continuous rigid insulation and cavity insulation on the interior side of the wall.

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Key elements of a wall system clad with insulated vinyl siding

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Right - Closed-cell spray foam insulation fills the wall cavities of the exterior walls in this home retrofit

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Right - Potential locations for crawlspace insulation: vapor sheeting should always cover the floor with insulation (a) outside walls, (b) inside walls, (c) both sides of walls, (d) sandwiched inside walls, or (e) under the first floor.

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Larsen trusses made of 9-inch I joists, set perpendicular to the exterior wall at 16 inches on center, provide a second wall cavity that can be filled with blown insulation, greatly increasing the insulation value in the walls.

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Rigid Foam Board Interior Insulation for Existing Foundation Walls

Guide

Guide describing how to insulate closed crawlspace walls and band joist areas with rigid foam board insulation.

Install an air barrier on the exterior of attic knee wall insulation.

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