ASHRAE Journal - May 2020 - 85
COLUMN BUILDING SCIENCES
FIGURE 16 Garage to house foundation with monolithic grade beam.
Cavity Insulation
Gypsum Board
Flashing Set in Mastic and
Sealed to Slab
Sealant, Adhesive or Gasket
Rigid Insulation
Fire-Rated Gypsum Board
Concrete Garage Slab
Polyethylene Vapor
Barrier Under Slab
4 in. Granular Capillary
Break and Drainage Pad
(No Fines)
Sill Gasket
4 in. Concrete Slab
Protection Board or Panel
Granular Capillary
Break and Drainage
Pad (No Fines)
Rigid Insulation
Concrete Grade
Beam
Polyethylene Vapor Barrier
Extended Under Grade Beam
Where it Also Acts as a
Capillary Break
TIME IS OF THE ESSENCE
ArmaFlex Ultra
®
with FlameDefense™ technology - the first elastomeric
insulation Classified by UL to UL 723 at 25/50. In an
emergency, it gives you time.
www.armacell.us
M AY 2020
ashrae.org
ASHRAE JOURNAL
ArmaFlex is a trademark of the Armacell Group © 2020
For exterior stair connections, no special details are
required for stem wall foundations internally insulated,
as the house slab is thermally uncoupled from the entire
perimeter of the house foundation stem wall.
When the slab is cast simultaneously with a grade beam
creating a monolithic assembly, insulation should be
installed between the exterior stairs and the house slab
foundation on the exterior of the slab edge/grade beam of
the house foundation extending vertically to the bottom
of the grade beam. The details are similar to the typical
approach for the perimeter of the house foundation.
OK, whew. Things have changed in the past halfdecade-termites, insects, structural loads, insulation
materials, radon and soil gas, and codes. Insulating
slab-on-grade foundations had to change to keep pace.
You can pretty much use any insulation in any climate
zone with any structural system. But at
the end of the day, don't forget about
the insect kingdom and the animal
kingdom and the humans that have to https://bit.ly/2V8P31I
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build the stuff.
85
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ASHRAE Journal - May 2020
Table of Contents for the Digital Edition of ASHRAE Journal - May 2020
Contents
ASHRAE Journal - May 2020 - Intro
ASHRAE Journal - May 2020 - Cover1
ASHRAE Journal - May 2020 - Cover2
ASHRAE Journal - May 2020 - 1
ASHRAE Journal - May 2020 - Contents
ASHRAE Journal - May 2020 - 3
ASHRAE Journal - May 2020 - 4
ASHRAE Journal - May 2020 - 5
ASHRAE Journal - May 2020 - 6
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ASHRAE Journal - May 2020 - Cover3
ASHRAE Journal - May 2020 - Cover4
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