
13
Insulation Requirements
• A standard paper faced insulation can be used in the joist cavity.
• Install the insulation tight against the subfloor to minimize any
convective losses that may be generated.
• The insulation should be a minimum of 3-1/2" (88.9 mm), or R-13,
berglassbattwhentheradiantfloorisinstalledoveraheatedspace,
such as a basement. 5-1/2"(139.7 mm), or R-19, batt (or thicker,
depending on the climate) should be used when the area below the
radiant floor is unheated or exposed to the elements.
Thin Slab with Sleepers
• Wooden sleepers are sometimes installed within a thin slab
application to allow for points of attachment for hardwood or other
floor coverings.
Please note:
In a thin slab application,
typically the tubing will be
run through doorways and
other openings rather than
directly through walls.
Thin Slab Insulation Detail
Thin Slab Layout Example
12" max
(304.8 mm)
ThinSlab
Insulation
SHOWER
SPA TUB
LINEN
STORAGE
WALK-IN
CLOSET
GAS FIREPLACE
MASTER
BATH
MASTER SUITE
Thin Slab with Sleepers Insulation Detail
8"
(203.2 mm)
ThinSlab
Insulation
Heating PEX or
Heating PEX-AL-PEX
Manifold
Location
Heating PEX or
Heating PEX-AL-PEX
Wooden
Sleeper
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