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Slab-on-grade Applications

• A common application consisting of any material or mass that

encapsulates the radiant tubing, such as concrete, sand, or soil.

Can be on or below grade.

Site Preparation

A radiant slab should always:

• Be placed on well drained base rock material.

• Be placed above an ample amount of crushed rock or gravel.

A radiant slab should never:

• Be placed directly on top of clay or organic subsoil.

• Be placed directly on top of solid bedrock.

Insulation Requirements

Two main areas to insulate:

• Vertically around the perimeter of the slab (required).

• Horizontally underneath the slab.

Bothaidintheslab’sresponseandefficiency.Ofthetwo,verticaledge

insulation is the most important for preventing heat loss directly to the

outside environment. Horizontal insulation helps decrease the slab’s

required start up time by isolating the slab from the ground below.

Type of Insulation

Recommended insulation:

• Extruded polystyrene insulation board or equivalent.

Not recommended:

• “Beaded” insulation boards.

• Foil-faced batt or board insulation.

• “Bubble-type” insulation.

A 1" (25.4 mm) insulation board (R-5 or better) is recommended.

Thicker board may be used in cold, aggressive climates. Always check

with an architect or structural engineer to ensure the appropriate

insulation is used.

Watts does not recommend bubble-type insulation under a slab

application. Most insulations of this type do not offer proper structural

support. Consult a structural engineer before using this or

similar product.

Post Concrete Pour

After the slab has been poured, interior walls and other support

structures still have to be installed, typically secured directly to the slab.

Take some preliminary precautions to protect the tubing

during construction. Avoid wall locations, place tubing deeper in the

areas to be below any anchor that will penetrate the slab.

Control Joints and Saw Cuts

Concrete slabs will expand and contract due to thermal changes. To

prevent damage to the slab, expansion joints are used to control

expansion and contraction due to thermal changes. In some cases,

saw cuts are used to control where cracking occurs. Make sure the

tubing is protected according to the requirements of the control joint.

Slab-On-Grade Cross Section

Slab

Rewire

or Rebar

Heating PEX or

Heating

PEX-AL-PEX

Base Rock

4 1/2"

Slab Insulation Detail

Minimum 1" (25.4 mm)

Extruded Polystyrene Insulation

Slab:Minimum2"(50.8mm)

covering above tubing

Expansion/Control Joints

Pass Through

Pass Under

Expansion/Control Joints

Pass Through

Pass Under

Control Joint Options

Heating PEX or

Heating

PEX-AL-PEX

SubGrade

Slab

12" min.

(304.8 mm)

Rewire

or Rebar

Protective

Sleeve

Joint

Pass Through

Pass Under

Heating PEX or

Heating

PEX-AL-PEX

Slab

Rewire

or Rebar

Joint

SubGrade

Do not exceed

minimum bend

radius of tubing

3" min

1 2 3 4 5 6 7 8 9 ... 17 18

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