ASHRAE Journal - March 2021 - 54

COLUMN BUILDING SCIENCES

PHOTO 3 Frame Wall. An insulated frame wall assembly

FIGURE 5 Concrete basement foundation wall with exterior rigid insulation.

can be located to the interior of the interior rigid insulation.
Vinyl or Aluminium Siding
Rigid Insulation (Taped
Or Sealed Joints)
Sealant, Adhesive or Gasket
Adhesive
Floor Assembly Cantilevered Over
Foundation Wall to Account for Thickness
Of Exterior Basement Insulation
Protective Membrane Strip

Cavity Insulation
Gypsum Board
Sealant, Adhesive or Gasket
Sealant at Corner of Bottom Plate and
Subfloor or Gasket Under Bottom Plate
Cavity Insulation
Sealant
Sill Gasket

Flashing
Cellular PVC Protection Board
Ground Slopes Away From Wall at 5%
(6 in. per 10 ft) Impermeable Backfill
PHOTO 4 Exterior Rigid Insulation. Extruded polystyrene is

installed on the exterior of the concrete foundation wall.

Concrete Foundation Wall

Impermeable Backfill
Granular Backfill

Rigid Insulation

Sealant Over Bond Break Material

Dampproofing
Filter Fabric

Concrete Slab

Coarse Gravel
(No Fines)
Perforated Drain Pipe
Capillary Break Over Footing
(Dampproofing or Membrane)
Concrete Footing

Concrete Basement Foundation With
Exterior Rigid Insulation

Granular
Capillary Break
and Drainage
Pad (No Fines)

PHOTO 5 Exterior Rigid Insulation. High density fiberglass rigid insulation, which
provides exterior drainage and control of hydrostatic pressure.

Applicability-All Hygro-Thermal Regions
Figure 5 and Photo 4 illustrate a concrete basement
foundation wall with exterior rigid insulation. The
exterior insulation layer is protected with a sealed
cement board protecting the insulation layer during
the construction process and subsequently during
its useful service life. Note the protective membrane
strip sealed to the top of the foundation wall for insect
control. Exterior rigid insulation is located at the rim
joist floor framing to control summer condensation.
When insulating sheathing is not used, rigid insulation should be installed to the interior of the rim joist
or an air impermeable insulation should be applied at
the rim joist assembly. Note the capillary break at the
top of the footing. Further note the air sealing of the
top of the concrete slab to the interior of the concrete
54

ASHRAE JOURNAL

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MARCH 2021

perimeter wall. This seal is necessary to control soil
gas ingress. The exterior rigid insulation can be rigid fiberglass or rigid
mineral wool-both of which provide
exterior drainage and control of hydro- https://bit.ly/3o6Pw0R
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static pressure (Photo 5).


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ASHRAE Journal - March 2021

Table of Contents for the Digital Edition of ASHRAE Journal - March 2021

Contents
ASHRAE Journal - March 2021 - Intro
ASHRAE Journal - March 2021 - Cover1
ASHRAE Journal - March 2021 - Cover2
ASHRAE Journal - March 2021 - 1
ASHRAE Journal - March 2021 - Contents
ASHRAE Journal - March 2021 - 3
ASHRAE Journal - March 2021 - 4
ASHRAE Journal - March 2021 - 5
ASHRAE Journal - March 2021 - 6
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ASHRAE Journal - March 2021 - Cover3
ASHRAE Journal - March 2021 - Cover4
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