ARDEX FLEXBONE® HEAT

ARDEX Americas

400 Ardex Park Drive

Aliquippa, PA 15001 USA

724-203-5000

888-512-7339

www.ardexamericas.com

ARDEX

FLEXBONE

HEAT

In-Floor Heating Systems

Innovative Design for Maximum Comfort and Energy Efciency

3-in-1 In-Floor Heating, Uncoupling and Waterproong

Uncoupling: protects tile and grout joints from shear movement in the substrate

Waterproong: protection for use in bathrooms, laundry rooms and other wet areas

Maximum heat efciency, more heat comfort with less energy usage

Minimal roll memory – rolls out at every time!

High quality heating cables – more efcient, easier to install, less cable required

Ideal for large-format tile and stone installations

FLEXBONE

Effect: prell with mortar in just one pass

ARDEX Self-Leveling Underlayments; worry-free prell option that

fully encases cables

Single-Source, Complete System Solution

ARDEX FLEXBONE

HEAT

In-Floor Heating Systems

Description and Usage

ARDEX FLEXBONE

HEAT is an electrical in-floor heating

system for use with tile or stone. The unique crossbones

pattern provides less touch points between the cables and

the membrane, and less air space within the mat structure,

providing faster and more efficient heating of the floor

covering. The unique design also allows for easy prefilling

in just one pass with ARDEX high-performance mortars, or

approved ARDEX Self-Leveling Underlayments can be used

for easier, faster prefilling to fully encase the heat cables.

ARDEX FLEXBONE

HEAT can be used as a waterproofing

layer in bathrooms and other wet areas. Ideal for large-

format tile and stone installations, ARDEX FLEXBONE HEAT

is also an uncoupling membrane that helps to prevent

grout joint and tile damage from underlying substrate

movements.

ARDEX FLEXBONE HEAT is approved for

CSA-W = “Wet Rating.”

For Use Indoors on the Following Substrates

• Concrete

• Wood

• Screeds

• Gypsum

• Cement backer unit

• Existing tiles

Suitable Uses

*These requirements do not cover the use of electrical

heating systems on or as part of a certified fire resistance

building assembly.

Recommended Tools

Drywall square or straight edge, utility knife or ARDEX

FLEXBONE

Shears, 35 - 75 lb. roller or rubber float,

electrical tester and a 1/4” x 1/4” (6 x 6 mm) square

notch trowel

Accessories

ARDEX UD 146™ Edge Insulation Strip

ARDEX UD 156™ Movement Joint Tape

ARDEX SK 175™ Seam Tape

FLEXBONE

HEAT Cables - UL-E478486 -

UL Listed U.S. and Canada

ARDEX Thermostats and Power Modules -

UL-E157297 - UL Listed U.S. and Canada

o FLEXBONE

HEAT Remote WiFi and

Touch Thermostat - #30068

o FLEXBONE

HEAT Touch Programming

Thermostat - #30070

o FLEXBONE

HEAT Non-Programmable

Thermostat - #30072

o FLEXBONE

HEAT Power Module - #30074

Preparation

Materials: Deliver all material to the jobsite in the original,

unopened packaging under proper storage conditions.

It is the responsibility of the installation contractor to

inspect the ARDEX FLEXBONE HEAT for visual defects and

to verify that it is the correct type before beginning the

installation.

Acclimate the setting material, ARDEX FLEXBONE HEAT

and tile or stone in an enclosed building at a minimum

of 65°F (18°C) for at least 24 - 48 hours before the

installation. If possible, lay out the ARDEX FLEXBONE HEAT

during acclimation.

Floor Plan

Preparation of a pre-

installation plan showing

the position of the heating

cables, the floor sensor and

the cold conductor cable

system components as

well as a subdivision into

heating circuits is highly

recommended. To register

for the ARDEX FLEXBONE

HEAT System Warranty, please fill out and submit the

Installation Worksheet and Warranty Validation Form

located on the ARDEX FLEXBONE HEAT product page or

within the cable packaging.

It is possible that not all areas where the ARDEX FLEXBONE

HEAT mat is installed will be heated. Never install electrical

heating cables under vanities, showers, bathtub platforms,

free-standing bathtubs, kitchen cabinets, islands, solid

counters or any other fixtures or in closets. Excessive heat

will build up in these confined spaces and may cause cable

overheating. Because of this, there may be a difference

in the amount of heating cable vs. membrane to take into

account when calculating necessary product quantities.

Ensure that all furniture placed over ARDEX FLEXBONE

HEAT cables has bottom ventilation (e.g. mounting with

legs). Non-compliance may lead to loss of warranty due to

heating cable damage.

Do not run the heating cable under a wall or from one room

to another; an individual cable must not heat more than one

room. The heating section of the cable must be entirely

installed under the floor covering.

If the temperature regulation of heating circuits takes place

by means of more than one thermostat, the tile and stone

must be separated by expansion joints into field areas

corresponding to the heating circuits.

Substrate Preparation

For all substrates listed

below, acid etching,

adhesive removers, solvents

and sweeping compounds

are not acceptable means

for cleaning the substrate.

Substrate and ambient

temperatures must be a

Residential Construction Yes

Hotel* and Residential Bathrooms Yes

Cafeterias Yes

Commercial Ofces Yes

Restaurants Yes

Retail Stores Yes

Installation Floor Plan

(ignore unheated zones)

minimum of 50°F (10°C) for the installation of ARDEX

products. Substrates must be dry during installation and

cure.

Substrates also must be load-bearing, flat and structurally

sound. Vacuum all dust and debris.

All substrates must be

smooth and flat with a

maximum variance of 1/4”

in 10’ (6 mm in 3 m) from

the required plane per TCNA

or TTMAC guidelines, or as

recommended by the tile or

stone manufacturer (default

to the most stringent requirement).

Should pre-leveling or subfloor repair be required, use one

of the materials listed below, as appropriate. Observe the

instructions and dry times in the ARDEX technical data

sheets.

**Refer to the ARDEX A 38 and ARDEX A 38 MIX technical

data sheets for further instructions.

For more detailed information on substrate preparation,

please refer to the ARDEX Substrate Preparation Technical

Data Sheet at www.ardexamericas.com.

NOTE ON ASBESTOS-CONTAINING MATERIALS

Please note that when removing existing flooring, any

asbestos-containing materials should be handled and

disposed of in accordance with applicable federal, state

and local regulations.

Concrete Substrates

All concrete substrates must be solid, structurally sound,

fully cured, clean, dry and free of oil, wax, grease, asphalt,

latex and gypsum compounds, curing compounds, sealers

and any contaminant that might act as a s bond breaker.

If necessary, mechanically clean the floor down to sound,

solid concrete by shot blasting or similar. Over-watered,

frozen or otherwise weak concrete surfaces also must

be cleaned down to sound, solid concrete by mechanical

methods. Sanding equipment is not an effective method to

remove contaminants from concrete.

Wooden Subfloors

The wood subfloor must be constructed according to

prevailing building codes. It must be solid and securely

fixed to provide a rigid base free of undue flex. For

tile installations, the subfloor must be constructed in

accordance with ANSI L/360 or ANSI L/720 standards.

Any boards exhibiting movement must be properly

fastened. The surface of the wood must be clean and

free of oil, grease, wax, dirt, varnish, shellac and any

contaminant that might act as a bond breaker. If necessary,

sand down to bare wood. A commercial drum sander can

be used to sand large areas. Do not use solvents, strippers

or cleaners.

Vacuum all dust and debris. Open joints should be filled

with ARDEX SKM. It is the responsibility of the installation

contractor to ensure that the wood subfloor is thoroughly

clean and properly anchored prior to the installation of any

ARDEX material.

Exterior-grade plywood and OSB subfloors must be either

5/8” (approx. 15 mm) or 3/4” (18 mm) tongue and groove.

Fasten plywood or OSB every 6” (15 cm) o.c. along sheet

ends and 8” (20 cm) o.c. along intermediate supports

with ring-shank nails or screws. Allow 1/8” (approx. 3 mm)

between sheets. All sheet ends must be supported by a

framing member and properly fastened.

The underlayment must be constructed of 3/8” (9 mm)

plugged-faced, exterior-grade plywood or OSB and

fastened every 6” (15 cm) along sheet ends and 8” (20

cm) in the panel field with ring-shank nails or screws. Allow

1/8” (approx. 3 mm) between sheets on all edges and

ends and 1/4” (approx. 6 mm) at perimeter walls and any

abutting surfaces. Offset underlayment joints from the

joints in the subfloor.

For Ceramic or Porcelain Tile Installations

If a single layer of plywood or OSB will be installed, a joist

spacing of either 16” (40 cm) o.c. or 19” (49 cm) o.c. is

required.

For 16” (40 cm) o.c. joist spacing, the minimum subfloor,

nominal thickness must be 5/8” (approx. 15 mm) tongue

and groove wood.

For 19.2” (49 cm) o.c. joist spacing, the minimum subfloor,

nominal thickness must be 3/4” (18 mm) tongue and

groove wood.

For 24” (61 cm) o.c. joist spacing, a double layer of

plywood or OSB is required. The minimum subfloor,

nominal thickness must be 3/4” (18 mm) tongue and

groove wood, and the minimum underlayment, nominal

thickness must be 3/8” (9 mm).

For Natural Stone Tile Installations

When installing natural stone over wood subfloors, two

layers of plywood or OSB are required regardless of joist

spacing, per TCNA and TTMAC guidelines. However,

the joist spacing size must not exceed 24” (61 cm) o.c.

The double-layer wood flooring must have a minimum

subfloor, nominal thickness of 3/4” (18 mm) tongue and

groove wood as well as a minimum underlayment, nominal

thickness of 3/8” (9 mm).

Highly-Absorbent Substrates

Highly-absorbent substrates, such as gypsum, must be

double primed with ARDEX P 51™ Primer.

Product Substrate Interior

ARDEX A 38™ Rapid Set

Screed or ARDEX A 38 MIX™

Rapid Set, Premixed Screed

Concrete X

Wood X**

ARDEX AM 100™ Rapid Set

Pre-Tile Smoothing and

Ramping Mortar

Concrete X

Wood

ARDEX Liquid

BackerBoard

Self-Leveling

Underlayment for Interior Wood

and Concrete Suboors

Concrete X

Wood X

ARDEX TL 1000™ Self-Leveling

Underlayment

Concrete X

Wood

ARDEX SKM™ Skimcoat Patch

& Finishing Underlayment

Concrete X

Wood X

Mortar Selection

Install the ARDEX FLEXBONE HEAT and tile or stone using

one of the following ARDEX setting materials:

Uncoupling Membrane Installation

Place the ARDEX FLEXBONE

HEAT membrane so that

it is perpendicular to the

subsequent installation

direction of the tile or stone

installation. Trim the ends of

each section as necessary

to fit the surface area to be

covered. Align the lengthwise edge of the material exactly

with that of the adjacent section, and ensure that all rolls

are placed so that the crossbone pattern halves line up.

When the ARDEX FLEXBONE HEAT membrane sections

are joined together end to end, the crossbone pattern

MUST form a complete matching unit as shown in the blue

circle. NOTE: The ARDEX FLEXBONE HEAT installation

must not extend beyond the room or area in which

it originates. ARDEX FLEXBONE HEAT must not be

installed in closets, over walls, over partitions that

extend to the ceiling or over cabinets.

Lift the placed mat, and use

the flat side of a trowel to

key in the approved ARDEX

mortar to the substrate.

Apply the mortar to the

substrate using a

1/4” x 1/4” (6 x 6 mm)

square notch trowel,

leaving a minimum bed of

1/8”-3/16” (3 mm - 4.5 mm).

The substrate must be thoroughly clean and free of dirt,

debris, sealers and any contaminant that might act as a

bond breaker. If necessary, mechanically clean the floor

down to sound, solid material by shot blasting or similar.

Highly-absorbent substrates require two applications of

ARDEX P 51. Make an initial application of ARDEX P 51

mixed with 3 parts water by volume. Apply evenly with a

soft push broom. Do not use paint rollers, mops or spray

equipment. Do not leave any bare spots. Brush off puddles

and excess primer. Let dry thoroughly (1 - 3 hours), and

install a second application of ARDEX P 51 mixed 1:1 with

water as stated above. Allow primer to dry to a clear, thin

film (min. 3 hours, max. 24 hours).

Existing Tiles

Contact the ARDEX Technical Department for specific

substrate requirements.

Joints and Cracks

All existing expansion

joints, isolation joints and

construction joints, as well

as all moving cracks, must

be honored up through the

uncoupling membrane and

tile or stone as indicated by

TCNA or TTMAC guidelines.

These joints must also be honored up through the heating

cables. Please refer to the cable installation section.

Perimeter and field movement joints are essential for door

areas, thresholds between rooms and geometric offsets,

as well as around walls, penetrations and fixed objects.

Install ARDEX UD 146 Edge Insulation Strip along walls,

rising structural elements and surface penetrations.

Arrange perimeter and field movement joints in accordance

with industry standards. Per TCNA/TTMAC guidelines,

please note that underfloor heating areas require additional

joints, as do interior areas exposed to direct sunlight, such

as floors in front of floor-length windows.

For areas with heavy loads, expansion joint profiles may be

necessary. Contact the expansion joint profile manufacturer

to ensure suitability for the intended use.

As needed, dormant cracks and dormant control joints can

be filled with ARDEX SKM, following the instructions in the

technical data sheet.

Suitable

to Install

ARDEX

FLEXBONE

HEAT to

substrate

Suitable to

Install Tile

and Stone

over ARDEX

FLEXBONE

HEAT

ARDEX S 28™ MICROTEC

Rapid-Set, Rapid-Dry,

Super-Format Tile and

Uncoupling Membrane Mortar

X X

ARDEX X 78™ MICROTEC

Semi-Pourable Tile and Stone

Mortar

X X

ARDEX X 77™ MICROTEC

Fiber Reinforced Tile and

Stone Mortar

X X

ARDEX X 5™ Flexible

Tile and Stone Mortar

X X

ARDEX X 7 R™ Rapid Set,

Flexible Tile and Stone Mortar

ARDEX FB 9 L™ Pourable

ShearFlex

Mortar

X X

ARDEX X 90 OUTDOOR™

MicroteC3 Rapid-Set,

Flexible Tile and Stone Mortar

X X

ARDEX X 32™ MICROTEC

Universal Rapid Setting

and Drying Thin-to-Thick

Bed Mortar

ARDEX N 23™ MICROTEC

Rapid Set Natural Stone

and Tile Mortar

Cable Installation

Allow the membrane and mortar course to cure in

accordance with the selected mortar technical data sheet,

then install the cables as detailed below. This product

must be installed by a qualified person in accordance with

this installation handbook and with the Canadian Electric

Code Part I (Canada) or the National Electric Code (U.S.)

as applicable. All electric connections must be made by a

qualified electrician, according to the electrical and building

codes effective in your region.

Unheated zones must

be designated prior to

installation and omitted

during placement of the

heating cables as per the

pre-installation plan.

TEST #1: Prior to installing

the heating cables, test

the total resistance of

the heating cables. Any

defective cables must be

replaced.

The socket-less transition

between the cold conductor

cable and the heating cable

is denoted precisely and

must be placed into the

ARDEX FLEXBONE HEAT

membrane. The cold lead

cable must be threaded

through a conduit from

the base of the wall to the thermostat electrical box. The

temperature sensors need to be threaded either inside the

same conduit as the cold lead or in a separate conduit.

The conduit and fittings must be UL listed.

Important! NEVER install the Hot/Cold factory

connection in the wall. This will cause overheating,

system failure, and could cause a fire. This

connection must be installed entirely under the

floor covering.

The heating cables

are placed around the

crossbones and between

the straights. This unique

pattern allows for radial

cable placement to prevent

damage. Avoid folding the

heating cable on itself. A

radius of curvature less

than 1/16” (1.5 mm) could damage its sheath.

NOTE: Under no circumstances should heating cables

bridge any moving joints, including expansion, isolation

and construction joints. If these joints exist in your

installation, different heating areas with separate heating

cables must be created. These can then be connected to

one thermostat using the power module, or to separate

thermostats.

The heating cable must be

spaced so that at least two

crossbone patterns are

between the cables (approx.

3.88” / 9.8 cm). Please

note that the minimum

installed bending radius of

the heating cable is 5 times

the cable thicknesses, or

Comb the mortar out over an area no larger than can be

covered by the ARDEX FLEXBONE HEAT membrane during

the setting material open time. If the mortar skins over, it

must be completely, mechanically removed and reapplied.

ARDEX mortars should be mixed to the high-water ratio

noted in the technical data sheet.

Carefully lay the ARDEX

FLEXBONE HEAT membrane

into the wet ARDEX setting

material with the fleece

side facing down and the

exposed plastic side up.

DO NOT let the material fall,

as this will trap air beneath

the membrane. At the

seams, butt the membrane

edges up against each

other.

Using a float, flat trowel or

35 - 75 lb. roller, smooth

and embed the membrane

into the bonding mortar.

Gently lift a corner of the

membrane to check for

proper coverage. Full

contact between the fleece

and setting material must

be achieved.

When approaching walls or other obstacles, cut the

membrane to the appropriate length using a utility knife

or ARDEX FLEXBONE Shears. Leave approximately 1/4”

(6 mm) between the membrane and the edge of the wall or

obstacle to allow for expansion. Use ARDEX UD 146 Edge

Insulation to create these perimeter joints.

Structural, expansion and

field boundary joints are

formed by separating the

ARDEX FLEXBONE HEAT

sections to the required

width. The joints in the

membranes are to be

covered with self-adhesive

ARDEX UD 156 Movement Joint Tape to protect against the

entry of mortar and grout.

In the case of structural and expansion joints, membranes

must be separated to the specified width of at least 3/8”

(8 mm). Field boundary joints for subdividing large covering

areas are formed on ARDEX FLEXBONE HEAT membrane.

The arrangement of joints in the tile or stone installation

must be in line with the separations of the membranes.

For waterproofing applications, use ARDEX SK 175

Seam Tape after the heating cables are installed (see

“ARDEX FLEXBONE HEAT as a Waterproofing System”

section below the “Cable Installation” section).

cold

lead

heating

cable

1.97” (5 cm). A narrower spacing may cause a fire or

damage the floor covering.

Important! Never CUT or modify the heating cable in

any way. This would change the cable resistance, will

cause damage to the cable, and could cause cable

overheating. This will also void the warranty! Multiple

cable lengths are available to fit different installation

areas.

Heating cables may not

cross, overlap or touch

each other. The minimum

spacing requirements are as

follows:

• From walls, partitions and fixed cabinets: 2” (5 cm)

• From other heat sources (baseboard heaters, fireplaces,

forced air heating ducts, etc.): 8” (20 cm)

• Plumbing drains: 4” (10 cm)

• Centerline of toilet drain: 7” (18 cm)

It is helpful to plan the location of a buffer zone, as it

is not possible to predict where the heating cable will

end. The buffer zone is an area where heating is not

essential and heating cable installation is not planned

(e.g., behind a toilet or adjacent to a door opening).

This area allows for placement of excess heating

cable. Heating cables may also be installed 6”

(15 cm) from the wall to create a buffer zone.

Position the floor sensors

between two heating cables.

Two floor temperature

sensors are provided - one

with the ARDEX FLEXBONE

HEAT thermostats and one

with the ARDEX FLEXBONE

HEAT heating cables.

Press the end of the floor

sensor into the membrane.

For non-waterproofing

installations, a notch can

be cut lengthwise into the

membrane to accommodate

the sensor. Cutting a notch

is not required when using

an ARDEX self-leveling

underlayment to prefill.

TEST #2: Before prefilling

the membrane, test the total

resistance of the heating

cables. Any defective cables

must be replaced.

ARDEX FLEXBONE HEAT as a Waterproofing System

In applications requiring waterproofing, all seams in the

ARDEX FLEXBONE HEAT membrane, as well as floor and

wall transitions, must be sealed with ARDEX SK 175 Seam

Tape using an approved ARDEX mortar after the heating

cables are installed. The seam tape must overlap these

seams and transitions by a minimum of 2” (5 cm) to secure

waterproof integrity. This practice may also be appropriate

in laundry rooms, spaces with icemakers and other areas

where an overflow or pipe break may occur. To do this:

Trowel mortar onto the

ARDEX FLEXBONE HEAT

membrane over seam areas

and/or the connecting

areas of adjacent structural

components.

Embed ARDEX SK 175

Seam Tape into the

approved ARDEX mortar.

During the tile or stone

installation (see below),

apply a layer of mortar

over the ARDEX SK 175

Seam Tape.

In some cases, the vertical section of the floor or wall

transition may not be compatible with bonding the ARDEX

SK 175 Seam Tape using a thin-set mortar. Connections

to these vertical substrates may otherwise be achieved

by using ARDEX CA 20 P™ Multi- Purpose Construction

Adhesive and Sealant.

Do not mechanically fasten any material through the ARDEX

FLEXBONE HEAT membrane, as this will compromise its

waterproofing and uncoupling capabilities.

Prefill and Tile or Stone Installation

Once the cables have been installed, as well as any seam/

transition waterproofing needed, prefill the membrane

using an approved ARDEX mortar.

After mixing the appropriate

ARDEX mortar, apply

the mortar to the ARDEX

FLEXBONE HEAT with

the flat side of a notched

trowel (keying in) to fill in

the membrane cavities. The

ARDEX FLEXBONE HEAT

membrane’s thickness is 1/4” (6 mm).

NOTE: Approved ARDEX self-leveling underlayments may

be used as an easier, faster prefill material that will easily

and fully encase the cables. Please contact the ARDEX

Technical Service Department for further instructions.

Comb additional mortar

over the prefilled membrane

with the appropriate notched

trowel for the size of the tile

or stone to be installed, and

directly lay the tile or stone

on top.

This application may occur “wet on wet.” Alternatively,

allow the prefilled mortar or ARDEX self-leveling

underlayment to cure a minimum of 16 hours prior to

combing additional mortar.

Follow TCNA or TTMAC standards for the installation of

tile and stone, including the proper transfer of setting

materials. Periodically remove and check tile or stone to

ensure full coverage.

2 in. (5 cm)

The mortar must be

installed to the top of the

ARDEX FLEXBONE HEAT

membrane. The mortar

thickness between the

membrane and the tile must

be a minimum thickness

of 1/8” (3 mm) up to a

maximum thickness of 3/8”

(9 mm). Using the correct notched trowel will provide the

proper thickness. Install metal edge or transition strips

where the tile ends along bordering, lower-lying surfaces.

TEST #3: Test the total

resistance of the heating

cables. Any defective cables

must be replaced.

NOTE: Do not walk on the ARDEX FLEXBONE HEAT

membrane until the mortar has cured. Prior to installing tile

or stone, ARDEX FLEXBONE HEAT should be protected with

boards in areas where foot traffic is necessary.

Allow the tile or stone installation to set in accordance

with the specific mortar technical data sheet prior to

proceeding with the grouting installation.

NOTE: Due to the properties of uncoupling membranes,

mortar type, tile type, tile size and climactic conditions,

the mortar curing time required prior to grouting may vary.

However, the ARDEX mortars allowable for use with ARDEX

uncoupling membranes typically permit grouting in 3 - 24

hours.

For grouting, use ARDEX

FL™ Rapid Set, Flexible,

Sanded Grout, ARDEX FH™

Sanded Wall and Floor

Grout or ARDEX WA™ High

Performance, 100% Solids

Epoxy Grout and Adhesive.

For soft and expansion

joints, use ARDEX SX™

100% Silicone Sealant for

Tile and Stone Applications.

Connecting to the

Thermostat

Connection of the heating

cable and the floor sensor

to the thermostat or

power module should be

completed by a certified

electrician. A dedicated

circuit is required for each application. In the circuit breaker

panel, clearly mark which breakers are connected to the

heating membrane. A ground fault circuit interrupter (GFCI)

is required for each circuit. The ARDEX FLEXBONE HEAT

thermostats include a Class A GFCI, thus a GFCI circuit

breaker is not required when using these thermostats.

The connecting wire in the transition between the cold

conductor cable and the heating cable may be shortened

to no less than 3 ft.

(1 m). Allow the tile and grout installation to cure as

detailed above prior to turning on the heating mat.

Important! NEVER install a cable designed for a

120 V power source on a 240/208 V power source.

This cable must be grounded. Connect the heating

cable ground to the ground wire from the electrical

panel.

Heating Cables - Warnings

• CAUTION: A ground fault protection device must be

used with this heating device. Refer to the Connecting

to the Thermostat section of this document.

• Before installing and operating this product, the user

and/or installer must read, understand and follow these

instructions and keep them handy for future reference.

• If you have a question, please contact Technical

Services by phone 888-512-7339 (724-203-5000) or

from our website at www.ardexamericas.com.

• If these instructions are not followed, the warranty will

be considered null and void and the manufacturer

claims no further responsibility for this product.

• Removing the cable label will void the warranty.

• De-energize all power circuits before installation

and servicing.

• Heating cables shall not be altered in the field. If

the installer or the user modifies the unit, he will be

held responsible for any damage resulting from this

modification, and the warranty and the product

certification will be void.

• NEVER use the heating cable for any purpose other

than heating a floor INSIDE a building.

• Heating cable testing is required while the heating

cable is on the spool and at two subsequent steps

during installation to ensure cable quality and for

warranty purposes.

• NEVER energize the cable while it is on the spool. This

would lead to overheating that could damage the cable

and may cause a fire.

• Keep ends of heating devices and kit components dry

before and during installation.

• The minimum temperature at which the cable should be

installed is 32˚ F (0°C).

Product Name Voltage Heat

Area

(sq. ft.)

Heat

Area

(m)

Cable

Length

(ft.)

Cable

Length

(m)

Watts Total

Resistance

Ω

ARDEX UH 910-15 120 15 1.4 39.6 12.1 150 96

ARDEX UH 910-22 120 21.5 2 57.9 17.7 225 64

ARDEX UH 910-28 120 28 2.6 78 23.8 300 48

ARDEX UH 910-36 120 35.5 3.3 98 29.9 375 38.4

ARDEX UH 910-42 120 42 3.9 118 36.0 451 32

ARDEX UH 910-49 120 48.5 4.5 136.4 41.6 525 27.43

ARDEX UH 910-55 120 55 5.1 156.4 47.7 600 24

ARDEX UH 910-63 120 62.5 5.8 176.4 53.8 675 21.33

ARDEX UH 910-68 120 68 6.3 196.4 59.9 750 19.2

ARDEX UH 910-81 120 81 7.5 234.8 71.6 900 16

ARDEX UH 910-95 120 95 8.8 274.8 83.8 1,050 13.71

ARDEX UH 910-108 120 107.5 10 313.2 95.5 1,200 12

ARDEX UH 910-122 120 121.5 11.3 353.2 107.7 1,350 10.67

ARDEX UH 910-134 120 133.5 12.4 391.6 119.4 1,500 9.6

ARDEX UH 910-151 120 150.5 14 439 133.8 1,679 8.58

ARDEX UH 910-15 240 15 1.4 39.6 12.1 150 384

ARDEX UH 910-22 240 21.5 2 57.9 17.7 225 256

ARDEX UH 910-28 240 28 2.6 78 23.8 300 192

ARDEX UH 910-36 240 35.5 3.3 98 29.9 375 153.6

ARDEX UH 910-42 240 42 3.9 118 36.0 451 128

ARDEX UH 910-49 240 48.5 4.5 136.4 41.6 525 109.71

ARDEX UH 910-55 240 55 5.1 156.4 47.7 600 96

ARDEX UH 910-63 240 62.5 5.8 176.4 53.8 675 85.33

ARDEX UH 910-68 240 68 6.3 196.4 59.9 750 76.8

ARDEX UH 910-81 240 81 7.5 234.8 71.6 900 64

ARDEX UH 910-95 240 95 8.8 274.8 83.8 1,050 54.86

ARDEX UH 910-108 240 107.5 10 313.2 95.5 1,200 48

ARDEX UH 910-122 240 121.5 11.3 353.2 107.7 1,350 42.67

ARDEX UH 910-134 240 133.5 12.4 391.6 119.4 1,500 38.4

ARDEX UH 910-151 240 150.5 14 439 133.8 1,679 34.31

ARDEX UH 910-172 240 172 16 510.8 155.7 1,954 29.48

ARDEX UH 910-194 240 194 18 569.2 173.5 2,177 26.46

ARDEX UH 910-216 240 215.5 20 635.5 193.7 2,431 23.69

ARDEX UH 910-248 240 247.5 23 744.8 227.0 2,849 20.22

ARDEX FLEXBONE

HEAT Cable Sizes and Information

Thermal Resistance Chart

Please note that the maximum thermal resistance (R-Value)

permitted above the ARDEX FLEXBONE HEAT installation

must not exceed R-1. See below for examples of thermal

resistance values of various floor coverings and materials.

Please also note that building insulation beneath ARDEX

FLEXBONE HEAT cannot exceed R-20.

Material

The ARDEX FLEXBONE HEAT membrane consists of a

specially shaped, rot-proof plastic film (PP) with a thickness

of 1/4” (6 mm) and factory-laminated, non-woven clawing

material on the underside.

Size and Coverage Available

1/4” (6 mm) Mat - 39” wide x 41’ long (1 m wide x 12.5 m

long) roll: Coverage of 134.5 sq. ft. (12.5 sq. m) per roll

Sheet - 38.5” wide x 31” long (0.98 m wide x 0.79 m)

Coverage of 8.3 sq. ft. (0.77 sq. m) per sheet

Robinson Test Results

ARDEX FLEXBONE HEAT received an Extra Heavy Rating.

Warranty

Eligible for the ARDEX FLEXBONE

HEAT System Warranty

with the submittal of the Installation Worksheet and

Warranty Validation Form located on the ARDEX FLEXBONE

HEAT product page or within the cable packaging. Failure

to follow written directions will void the warranty. For

complete warranty details, please contact our Customer

Service Center at 888-512-7339.

Notes

FOR PROFESSIONAL USE ONLY.

Store and transport rolls vertically in the original

packaging.

Store in temperatures from 32°F - 72°F (0°C - 22°C),

and protect from sunlight and high humidity. Storage

temperature resistance is from -22°F (-30°C) up to 158°F

(70°C). The original packaging only offers short-term UV

protection.

Dispose of packaging and residue in accordance with

federal, state and local waste disposal regulations.

***Tile and stone must be a minimum size of 2” x 2”

(5 cm x 5 cm).

****ARDEX recommends a polymer-modified tile and

stone mortar with an ISO 13007 C2 designation and/

or that complies with ANSI A 118.4, ANSI A 118.11 or

ANSI A 118.15 to install the ARDEX FLEXBONE HEAT and

tile or stone. ARDEX tile and stone mortars are highly

recommended due to their unique hardening and curing

capabilities.

Precautions

Carefully read and follow all precautions and warnings on

the product label. For complete safety information, please

refer to the Safety Data Sheets (SDS) of the installation

products available at www.ardexamericas.com.

Made in Germany.

Content updated 2023-10-10.

Published 2023-10-10. Supercedes all previous versions.

Check www.ardexamericas.com for most recent version

and for technical updates, which may supersede the

information herein.

Visit www.youtube.com/ARDEX101 to watch ARDEX Americas

product videos.

For easy-to-use ARDEX Product Calculators and Product Information On the

Go, download the ARDEX App at the iTunes Store or Google Play.

ARDEX Americas

400 Ardex Park Drive

Aliquippa, PA 15001 USA

Tel: 724-203-5000

Toll Free: 888-512-7339

www.ardexamericas.com

Floor

Coverings

Thickness Thickness Thermal

Conductivity

Insulation

Capacity

Thermal

Resistance

Thermal

Resistance

Material mm inches Lambda

Value W/

R-Value

(mK/W)

(ft

•F•h/Btu)

Nominal

Tile 10 mm 3/8” 1.1 0.009 2.85

Granite/

Marble

20 mm 3/4” 2.8 0.007 2.22

Concrete

Block

12 mm 1/2” 2.1 0.006 1.9

Linoleum 2.5 3/32” 0.18 0.014 4.43

Vinyl 2 mm 5/64” 0.2 0..010 3.17

Carpet 8 mm 5/16” 0.07 0.114 36.14

3-Layer

Parquet

8 mm 5/16” 0.13 0.062 19.65

2-Layer

Parquet

12 mm 1/2” 0.18 0.067 21.24

Cork

Parquet

4 mm 5/32” 0.08 0.050 15.85

Laminate 9 mm 3/8” 0.21 0.043 13.63

Smoothing

Compounds

10 mm 3/8” 1.1 0.009 2.85