LATICRETE 0802-0084-2, 0802-0067-2, 0802-0017-2, 0802-0100-2, 0802-0133-2 Installation Manual

STRATA_HEAT™ Wire installation using STRATA_HEAT Spacing Strips.

IMPORTANT

Read this manual before attempting
to install your STRATA_HEAT™ Wire.
Incorrect installation could damage the
STRATA_HEAT™ Wire and will invalidate the warranty.

Globally Proven

Construction Solutions

120V & 240V
WIRE

Loose Cable Installation Manual

Warranty

LIFETIME

*

2

n

STRATA_HEAT

™

Wire

n

Installation Manual

n

STRATA_HEAT Spacing Strips not included in package

(Sold separately)

ITEMS REQUIRED FOR SYSTEM
INSTALLATION:

n

A STRATA_HEAT Thermostat with an integrated Ground

Fault Circuit Interrupter or separate GFCI breaker
installed in the household panel

n

Digital ohmmeter (multi-meter)

n

Electrical housing boxes/switch plates

n

Electrical conduit

n

Adhesive or hot melt glue

Before You Begin .................................................................................3

Product Information ............................................................................. 3

Area Guide ...........................................................................................4

Do’s and Dont’s ................................................................................. 5-6

STRATA_HEAT™ Wire Specifications ...................................................... 7

STRATA_HEAT Wire Heating Cable Selection .............................................8

Thermal Insulation ................................................................................8

Floor Coverings.....................................................................................8

Subfloor Preparation..............................................................................9

Controlling Your System ......................................................................10

Wiring Diagram 120V .........................................................................11

Wiring Diagram 240V .........................................................................12

Electrical Provisions .............................................................................13

Testing the System .............................................................................14

Planning Your Installation ....................................................................15

Installing the STRATA_HEAT Spacing Strips .............................................15

Spacing Guide ....................................................................................15

STRATA_HEAT Wire Installation.............................................................16

Installing the Floor Sensor....................................................................17

Installing the STRATA_HEAT Thermostat .................................................17

Floor Coverings – Tiles & Stone, Carpet, Vinyl or Laminate Flooring ..........18

Floor Coverings – Hardwood Flooring ...................................................19

Points to Remember ...........................................................................20

Troubleshooting ..................................................................................21

Notes ...............................................................................................22

Control Card .......................................................................................23

Floor Plan .........................................................................................24

Warranty ...........................................................................................25

Notes ................................................................................................26

CONTENTS

If these instructions are followed you should not have any problems
during installation. However, if you require assistance at any stage,
please call our helpline: 203-393-0010 ext 235.

3

Thank you for purchasing the STRATA_HEAT

™

Wire. This manual contains IMPORTANT information regarding the safe use and

installation of your heating cable. Please read through the entire manual carefully before you install or use the product.

Double check your measurements and ensure that you have the correct heating cable for the area you wish to heat. The heating element
MUST NOT be installed under appliances or permanent fixtures such as refrigerators, cabinets, tubs, vanity units etc. Below is a quick
reference guide.

BEFORE YOU BEGIN

Product Information

The STRATA_HEAT Wire consists of:

A twin conductor resistance heating cable with a primary insulation of Fluoropolymer with high dielectric strength and high temperature
properties. The conductors are covered by a ground braid providing additional mechanical strength and a ground path. A final outer jacket
of PVC is given to make it sturdier and provide corrosion protection.

The heating cable is terminated at one end with a 10' (3.1 m) cold lead. The conductor cores and ground braid are factory joined in a
water resistant joint assembly to each supply conductor and ground conductor of the unheated lead. The heater is terminated at the other
end with a smaller water resistant joint.

The unheated power connection lead (10 ft / 3.1 m) can be trimmed to your needs or extended using a suitable UL-approved wire.
Always complete cable connections in a junction box. Do not leave excess wire in the wall. This must be carried out by a qualified
electrician in accordance with local/state laws and guidelines. Inspect the entire heating cable for damage, this includes the factory made
joint and end termination. If any parts are damaged contact LATICRETE Customer Service.

If you are missing any items from the box or believe that you have the incorrect STRATA_HEAT Wire to cover the area required, please call
the helpline for further assistance.

4

PRODUCT CODE

Cable Length

ft (m)

Uncoupling Systems Loose laid cable w/spacers

2 Pegs 3 Pegs 4 Pegs 2" (51 mm) 3" (76 mm) 4" (102 mm)

0802-0017-2 17 (5.2)

3 5 7 3 4 6

0802-0034-2 34 (10.4)

7 10 13 6 8 11

0802-0050-2 50 (15.2)

10 15 20 8 12 17

0802-0067-2 67 (20.4)

13 20 27 11 17 22

0802-0084-2 84 (25.6)

17 25 33 14 21 28

0802-0100-2 100 (30.5)

20 30 40 17 25 33

0802-0133-2 133 (40.5)

27 40 53 22 33 44

0802-0166-2 166 (50.6)

33 50 67 28 42 55

0802-0200-2 200 (61)

40 60 80 33 50 66

0802-0233-2 233 (70)

47 70 93 39 58 77

0802-0266-2 266 (81.1)

53 80 107 44 66 88

0802-0299-2 299 (91.1)

60 90 120 50 75 100

0802-0332-2 332 (101.2)

67 100 133 55 83 111

0802-0365-2 365 (111.3)

73 110 147 61 91 122

0802-0398-2 398 (121.3)

80 120 160 66 99 133

0802-0083-4 83 (25.3)

17 25 33 14 21 28

0802-0100-4 100 (30.5)

20 30 40 17 25 33

0802-0133-4 133 (40.5)

27 40 53 22 33 44

0802-0166-4 166 (50.6)

33 50 67 28 42 55

0802-0200-4 200 (61)

40 60 80 33 50 66

0802-0233-4 233 (70)

47 70 93 39 58 77

0802-0266-4 266 (81.1)

53 80 107 44 66 88

0802-0299-4 299 (91.1)

60 90 120 50 75 100

0802-0332-4 332 (101.2)

67 100 133 55 83 111

0802-0415-4 415 (126.5)

83 125 167 69 104 138

0802-0498-4 498 (151.8)

100 150 200 83 124 166

0802-0581-4 581 (177.1)

117 175 233 97 145 194

0802-0664-4 664 (202.4)

133 200 266 111 166 221

0802-0747-4 747 (227.7)

150 225 300 124 187 249

0802-0830-4 830 (253)

167 250 333 138 207 276

120 Volt

240 Volt

AREA GUIDE

Ensure that you have the correct STRATA_HEAT™ Wire for the area you wish to heat using the table below.

5

DO’S AND…

DO carefully read this installation manual before commencing installation.

DO When loose laying the STRATA_HEAT

™

Wire on the floor, maintain a consistent cable spacing of no less than 2”

(51 mm) and no more than 4" (102 mm).

DO make sure all electrical work is done by qualified persons in accordance with local building and electrical codes, the

National Electrical Code (NEC), especially article 424, Part V of the NEC, ANSI/NFPA 70, for the US and Canadian
Electrical Code, Part 1, for Canada.

DO check the resistance of the STRATA_HEAT Wire before, during, and after installation to ensure that the

STRATA_HEAT Wire has not been damaged. The value should match the rating label found on the product. A
tolerance of +/- 5% is allowed.

DO ensure that the STRATA_HEAT Wire is connected to a Class A Ground Fault Circuit Interrupter (GFCI) at all times.

DO plan the heating system layout and installation so that any drilling after tiling (e.g. for fixtures such as vanity units,

tubs) will not damage the wiring. Remember to keep a copy for future reference.

DO take some pictures before installing the floor covering for future reference.

DO ensure that the STRATA_HEAT Wire is separated from other heat sources such as luminaires and chimneys.

DO ensure that the minimum bending radius is no less than 1" (25 mm) for the STRATA_HEAT Wire.

DO allow sufficient drying/curing of the subfloor before commencing installation of the STRATA_HEAT Wire.

DO ensure that each tile is solidly bedded in tile adhesive, with no gaps or voids beneath.

DO make sure that ALL STRATA_HEAT Wires including the joints are positioned under the final floor finish and

completely embedded in thinset/adhesive.

DO remember to install the floor probe for the STRATA_HEAT Thermostat. The floor sensor should be located in the centre

of two heating element runs. Ensure that the sensor does not touch or cross over any of the STRATA_HEAT Wires.

DO ensure that you have electrical provisions to run the heating system at 120VAC /or 240VAC depending on the

system being installed.

DO check the wattage and voltage of the STRATA_HEAT Wire to ensure you have the correct system for your application.

DO ensure that the cold tail conduit is kept separate from the sensor conduit.

DO remember to attach the rating labels included within this manual to the circuit breaker and thermostatics controls.

6

…DONT’S

DON’T allow the STRATA_HEAT

™

Wire on the mat to cross over or touch each other at any point as this can cause the cable

to overheat. Always use the STRATA_HEAT Spacing Strips to avoid this.

DON’T cut or shorten the STRATA_HEAT Wire at any time.

DON’T install the STRATA_HEAT Wire with any staples or other metal fixings that can damage the STRATA_HEAT Wire.

DON’T store tiles, sharp or heavy objects on any of the STRATA_HEAT Wire while tiling or bang a trowel on the installation

area to remove excess mortar from the trowel.

DON’T install the STRATA_HEAT Wire below 5°F (-15°C) ambient temperature.

DON’T attempt to bypass the GFCI if it trips and cannot be reset during normal operation. Consult a qualified electrician or

call the helpline for further assistance.

DON’T install the STRATA_HEAT Wire under permanent fixtures.

DON’T commence installation on a mud job/screed that has not been fully cured.

DON`T use the STRATA_HEAT Wire system until you have allowed sufficient drying period for the finished floor.

DON’T cover the cold lead joint or termination joint with tape when securing the subfloor. This may cause air pockets

resulting in the joints overheating.

DON’T install the STRATA_HEAT Wire beyond the room or area in which they originate.

DON’T attempt to repair the STRATA_HEAT Wire if it becomes damaged. Call the technical helpline for further instructions.

DON`T allow the STRATA_HEAT Thermostat to exceed the maximum temperature for your final floor finish. Always check

the maximum temperatures allowed with the floor covering manufacturer.

DON’T switch on the installed STRATA_HEAT Wire until tile adhesive has fully cured (1 – 3 weeks minimum), check

adhesive manufacturer’s instructions.

DON’T install the cold leads closer than 2" (51 mm) from the STRATA_HEAT Wire on the mat.

7

3.5" (89 mm)
Spacing

120 Volt

Area ft² (m²) Model Length ft (m) Wattage (W) Amps (A) Resistance (Ω)

5 (0.46) 0802-0017-2 17 (5.2) 65 0.5 221.5

10 (0.93) 0802-0034-2 34 (10.4) 130 1.1 110.8

15 (1.39) 0802-0050-2 50 (15.2) 195 1.6 73.8

20 (1.86) 0802-0067-2 67 (20.4) 260 2.2 55.4

25 (2.32) 0802-0084-2 84 (25.6) 325 2.7 44.3

30 (2.79) 0802-0100-2 100 (30.5) 390 3.3 36.9

40 (3.72) 0802-0133-2 133 (40.5) 525 4.4 27.4

50 (4.64) 0802-0166-2 166 (50.6) 655 5.5 22.0

60 (5.57) 0802-0200-2 200 (61) 785 6.5 18.3

70 (6.50) 0802-0233-2 233 (70) 920 7.7 15.6

80 (7.43) 0802-0266-2 266 (81.1) 1050 8.8 13.7

90 (8.36) 0802-0299-2 299 (91.1) 1180 9.8 12.2

100 (9.29) 0802-0332-2 332 (101.2) 1315 11.0 11.0

110 (10.22) 0802-0365-2 365 (111.3) 1445 12.0 10.0

120 (11.15) 0802-0398-2 398 (121.3) 1575 13.1 9.1

STRATA_HEAT™ WIRE SPECIFICATIONS

3.5” (89 mm)
Spacing

240 Volt

Area ft² (m²) Model Length ft (m) Wattage (W) Amps (A) Resistance (Ω)

25 (2.32) 0802-0083-4 83 (25.3) 335 1.4 177.2

30 (2.79) 0802-0100-4 100 (30.5) 400 1.6 147.7

40 (3.72) 0802-0133-4 133 (40.5) 535 2.2 110.1

50 (4.64) 0802-0166-4 166 (50.6) 670 2.7 87.9

60 (5.57) 0802-0200-4 200 (61) 800 3.3 73.4

70 (6.50) 0802-0233-4 233 (70) 935 3.8 62.6

80 (7.43) 0802-0266-4 266 (81.1) 1070 4.4 54.9

90 (8.36) 0802-0299-4 299 (91.1) 1205 4.9 48.8

100 (9.29) 0802-0332-4 332 (101.2) 1340 5.5 44.0

125 (11.61) 0802-0415-4 415 (126.5) 1675 6.8 35.1

150 (13.94) 0802-0498-4 498 (151.8) 2010 8.2 29.2

175 (16.26) 0802-0581-4 581 (177.1) 2345 9.6 25.0

200 (18.58) 0802-0664-4 664 (202.4) 2680 11.0 22.1

225 (20.90) 0802-0747-4 747 (227.7) 3015 12.3 19.5

250 (23.23) 0802-0830-4 830 (253) 3240 13.5 17.8

Note: The STRATA_HEAT™ Wire spacing must be no less than 3" (76 mm) at all times. The maximum area loading MUST NOT exceed
15W/sq ft. (15 W/929 cm2)

8

The table below can be taken as a general guide. Actual requirements will depend on the floor construction, type of floor coverings,
insulation levels etc. The STRATA_HEAT™ Wire selection will depend on the application.

Application W/sq ft

New floors in builds with high levels of insulation 13W/sq ft (13W/929 cm2)

Wooden floors 11W/sq ft (13W/929 cm

2)

Wet areas (showers, bathrooms, steam rooms etc) 13W/sq ft (13W/929 cm

2)

Note: The UL Listing for this product covers use in wet locations for CANADA only. Wet location installation in United States shall be
in accordance with the National Electric Code, NFPA 70 and any other applicable jurisdictional code and final acceptance is to be made by
the Authority having Jurisdiction (AHJ).

Thermal Insulation

The insulation levels of a floor will affect both the performance & running costs of under tile heating. Using the heating cable without
thermal insulation can take up to 5 hours to heat a room whereas a system with thermal insulation takes less than an hour.

If the LATICRETE STRATA_HEAT Wire is being installed onto a concrete base it is highly recommended that a layer of insulation is used
prior to installing the heating cable. The thermal insulation reflects the heat upwards instead of allowing heat to penetrate into the
subfloor, greatly improving the warm-up times & running costs.

The thickness of insulation required will depend on whether it is for floor renovation or a new floor.

Floor Coverings

All floor finishes should be installed as per the manufacturer´s instructions. With radiant heating, the floor covering is essentially part of
the heating system. The most suitable floor coverings are those with a low thermal resistance, normally referred to as the R-value.
The type and thickness of floor covering materials used with this product must not exceed a thermal insulation “R” value of 1.

Floor covering R Value

Carpet 1.0

Ceramic, Mosaic Tile 0.15

Laminate Flooring 0.675

Natural Stone 0.38 - 0.114

Wood Flooring 0.80

STRATA_HEAT™ WIRE HEATING CABLE SELECTION

9

Ensure that the subfloor is smooth, dry and free from dust. Visually check that there are no objects on the floor that might damage the
heater.

Where necessary an appropriate smoothing compound should be applied and allowed to cure.

If the cable is being fitted to a solid floor it is essential that the concrete slab has been allowed to cure.

If using the HYDRO BAN

®

Boards, use a suitable cement based adhesive and screws to the subfloor as per the instructions.

If installing in a wet room ensure a slope in the mortar bed is maintained in order to direct water to the drain pipe.

SUBFLOOR PREPARATION

10

LATICRETE only recommends STRATA_HEAT™ Thermostats designed for use with underfloor heating to control the STRATA_HEAT Wire
loose heating cables. When using multiple loose heating cables you can connect them in parallel to the same thermostat. Check with your
installer or call LATICRETE for circuit sizes and maximum loads.

The thermostats come with a 9' (2.74 m) sensor cable to detect the temperature under the floor finish. The end of the probe wire
contains a capped sensor that should be evenly centered between two heating cables at least 12" (305 mm) into the heated area. At no
time should the probe wire cross the heating cable.

If you have more than one heating cable, all the lead wires need to be connected in parallel to the thermostat. For convenience, it may
be easier to run multiple lead wires to a junction box and then take a single wire (which has the appropriate rating) from the junction box
to the thermostat.

NOTE: 240V wires are Red and Black. 120V wires are Yellow and Black. Connect ground wires to the power source ground.

The total Amp load of the heating cable(s) must not exceed the thermostat’s Amp limit or the Amperage rating of the circuit or other
control switch without using an appropriately rated contactor/relay.

The LATICRETE STRATA_HEAT Wire has a maximum resistive load of 15 Amps. Please refer to the table on page 7 to calculate the
amperage load for your particular system.

For smaller areas, you may be able to utilize an existing circuit. In most cases, however, you will need a separate dedicated circuit to
power the LATICRETE STRATA_HEAT Wire heating cables.

The STRATA_HEAT Thermostat should be connected to the main electrical supply via a fuse or circuit in accordance with the National
Electrical Code. If the STRATA_HEAT Thermostat used does not include a built-in Ground Fault Circuit Interrupter (GFCI), then one must be
added to the circuit between the main power supply and the thermostat. If the thermostat does include a GFCI, it is NOT recommended to
include another in the circuit, as this may cause accidental tripping of the control unit.

Further details on the installation of the thermostat can be found in the instruction manual included with the thermostat.

Ensuring Safety

Install the STRATA_HEAT Thermostat within the same room as the STRATA_HEAT Wire heating cables. In order to ensure the efficient
running of the system within bathrooms, we recommend that the controls are located at least 60 inches (1.52 m) away from shower
openings or basin back splash areas so you minimize the possibility of exposure to water.

The control card on page 23 of this manual must be attached to the circuit breaker box for referral by the homeowner or electrical
inspector.

CONTROLLING YOUR SYSTEM

11

WIRING DIAGRAM 120V

12

WIRING DIAGRAM 240V

13

For each STRATA_HEAT™ Wire loose heating cable you install, you will have 1 unheated lead running from the floor to the thermostat’s
electric connection. The joint connecting the unheated lead to the heating cable must be at least 2 inches (51 mm) from the wall and
placed in a position to be covered by a thinset/adhesive under the final floor covering. THIS JOINT SECTION MUST NEVER BE PLACED IN
THE DRYWALL.

It may be necessary to chisel out short channels in the subfloor to minimize the increased height presented by the floor probe and the
unheated lead.

Neither the unheated lead nor sensor wire must cross, or come into contact with the heating element. Bear in mind that you will need to
make provisions for drawing the unheated lead and sensor wire up through the conduit to the control box.

NOTE: The leads must be protected where they leave the floor, by rigid metal conduit, intermediate metal conduit, rigid non metallic
conduit, electrical metallic tubing or by other approved means.

The installation of electrical systems presents risks of fire and electrical shock which can result in personal injury. Caution should always
be taken to guard against each such risk. All electrical connections should be carried out by a qualified electrician in accordance with the
National Electrical Code and all local Codes. For installations in Canada, refer to sections 12 and 62 of the CEC.

The STRATA_HEAT Wire loose heating cables MUST be connected to the electrical system through a Ground Fault Circuit Interrupter
(“GFCI”). If you are not using a thermostat with a built in GFCI, ensure that the branch circuits that supply your panels are GFCI­protected, or, if possible, a dedicated GFCI is incorporated in each circuit supplying your panels. This requirement is critical to the safe
operation of your STRATA_HEAT Wire loose heating cables.

ELECTRICAL PROVISIONS

ALWAYS use listed conduit, fittings
and other components.

Conduit to power source

Electrical box for connection to the
thermostat

Conduit for heating cable
cold lead.

Conduit for floor sensor

Heating cable

Floor Sensor

14

Each and every STRATA_HEAT™ Wire loose heating cable is subjected to careful testing before it is shipped from the factory.
However, damage does sometimes occur in storage or transit, and sometimes during
installation. We strongly recommend you test your heaters:

After unpacking them but before you install them,
and

After you have installed them but before you install the floor

covering (i.e. while the cables are still exposed),
and

After installation of the final floor covering.

Complete a simple visual inspection of the heating cable to make sure there is no visible damage.

A simple electrical inspection can be done with a digital ohmmeter to ensure the ohms resistance is what it should be. The ohm
resistance should be measured between the two conductors without touching the yellow-green wire, which is the ground connection.

Checking for resistance between the two conductor wires ensures there is no break in the cold lead conductor and the heat resistance
wire. It does not assure you that there is no electrical short in the circuit.

Place one probe on the black wire. Place the other probe on the yellow (red wire for 240V).

Resistance can vary significantly depending on the ambient temperature and an allowance of +/- 5% from the norm is acceptable.

Ensure cable is fully insulated:

Test across the yellow-green wire (ground). Place the other probe on the yellow (red wire for 240V ).

Confirm the reading is infinity (open circuit).

Repeat these steps to check the reading between the yellow-green wire (ground) and the black wire.

There should be no continuity between these wires and the ohms reading should be infinity (not zero). If your meter shows a number of
ohms between these wires, your heating cable has an electrical short. Take note of the resistance and contact LATICRETE.

In order to conduct a more thorough test for insulation verification, LATICRETE recommends the use of a megohmeter. Connect the
instrument’s black cable to the system’s ground and the red to the either one of the heating cable leads.

Note that depending on your meter model, you may read “kilo-Ohms” probably due to your fingers touching the probes (it’s your
body’s conductivity). If the readings are not satisfactory, do not commence installation contact LATICRETE for further advice.

TESTING THE SYSTEM

15

Before installing, draw an installation plan showing the placement of the
fixings guides, heating cables, floor sensor, and junction box or boxes.

It is important to mark the location of the cold lead joint on the plans. The
cold lead is the non-heating portion of the cable that will run in the wall to
connect the system to the thermostat. The heating cable shall not extend
beyond the room or area in which it originates.

Marking the heating cable layout on floor plan makes it easier to trace back
the heating cable for trouble shooting purpose. Keep such a layout filed
after installation.

Before installing the heating cables, refer to the spacing guide below to
ensure you have the correct number and size of heaters for the area you wish to heat.

Installing the STRATA_HEAT™ Spacing Strips

When using 12" (305 mm) STRATA_HEAT™ Spacing Strips to secure the cable to the subfloor, use the following provisions to ensure
proper spacing of the cable. The fixing guides included in the kit are 12" (305 mm) long with 1" (25 mm) spacing guides.

The perimeter STRATA_HEAT Spacing Strips should be installed a minimum of 3
inches (76 mm) away from the wall in the opposite direction to the cable runs
(Additional stabilizing guides could be laid 40 inches / 102 cm apart across
the floor). The STRATA_HEAT Spacing Strips can be secured to the floor using
hot glue, nails, screws or strong double-sided tape

It may be necessary to cut the guides into smaller sections to accommodate
irregular shaped rooms. The strips can be secured to the floor using hot glue,
nails or screws.

Once you have fitted the STRATA_HEAT Spacing Strips, the STRATA_HEAT Wire
may be laid out.

Spacing Guide

For precise calculation of spacing between loops (OCS), we recommend you
use the following calculation using the cable lengths given on page 4. For
additional clarification please call our technical support line: Technical Service
at 203-393-0010 Ext 235.

OCS (On Center Spacing) = Area (sq ft) × 12 or Area (m2) × 129.2

Length

PLANNING YOUR INSTALLATION

16

Before you start laying the STRATA_HEAT™ Wire ensure that the heating
cable(s) are tested.

Gently pull the unheated lead from the box. Do not remove the spool from the
box as this will cause the STRATA_HEAT Wire to twist.

After 10 feet (3 m) of cable has been removed, you will reach the point at
which the unheated lead joins the STRATA_HEAT Wire.

The joint should be taped to the floor at the start point. Ensure that the factory
joint lays flat on the floor.

The joint must be installed under the floor covering and covered with mortar or
self-levelling underlayment. A channel will need to be made into the subfloor
to accommodate the extra height of the joint.

Care should be taken to ensure that the joint is not bent at the point of entry
into the conduit as this may damage both the factory joint and/or the heating
element within.

Secure the joint to the subfloor using duct tape. Do NOT completely cover the
joint in tape as this may create air pockets resulting in failure of the joint.

Repeat this process for each STRATA_HEAT Wire installed.

Install the STRATA_HEAT Wire as per the installation plan.

The STRATA_HEAT Wire should be laid in parallel lines back and forth across
the main body of the area to be heated.

Use the spacing guide on page 4 to space the cable. The STRATA_HEAT Wire
must not be spaced out any closer than 2" (50 mm) at any time.

Ensure that the cable is held in place by the fixing guides and that you
maintain moderate tension on the cable to prevent it from lifting during the
installation of the final floor covering.

Using duct tape secure the end joint to the floor. Do not cover the whole joint
in tape as air pockets may cause the end joint to overheat.

STRATA_HEAT™ WIRE INSTALLATION

17

INSTALLING THE FLOOR SENSOR

The floor sensor is used for temperature regulation of the floor surface. The
end of the probe wire contains a capped sensor that should be centered
between two heating cables at least 12" (305 mm) into the heated area.

The sensor wire MUST NOT touch or cross over the STRATA_HEAT™ Wires.

Depending on the requirements of the tiler, it may be necessary to chisel out
short channels in the subfloor to minimize the increased height presented
by the floor probe. Before chiseling the area, ensure that the STRATA_HEAT
Wire, unheated lead and floor probe are protected to avoid damage during
chiseling. Place the floor probe into the channels and secure with fixing tape.

NOTE: Do NOT run the cold lead wires and the floor sensor in the same conduit.

Installing the STRATA_HEAT™ Thermostat

Instructions for the fitting of the STRATA_HEAT Thermostat can be found inside the thermostat box. Each cable has one unheated lead.
Please review the information on pages 10 through 13 before proceeding.

The protective ground wire leading from the unheated lead should be connected to the ground leading from the power supply.

IMPORTANT! Test the STRATA_HEAT™ Wire

Before installing the final floor finish ensure that the STRATA_HEAT™ Wire
is working properly using the method described on page 14.

Test the probe wire:

Temperature sensor wire must be verified before and after installation.
For probe resistances, refer to the STRATA_HEAT Thermostat instructions.

18

When installing the heating cable under tile or stone flooring choose one of the following methods:

1. Single Layer Method:

LATICRETE does not recommend this method as it is impractical to lay tiles and can cause damage to the STRATA_HEAT™ Wire. However,
when laying the tiles under the one-step method, start by applying thinset over the STRATA_HEAT Wire with the flat side of the trowel.
Then add thinset on top of that with the notched side to prepare for the tile.

2. Double Layer Method:

Embed the heating cable in a skim coat of self-leveling compound or modified thinset, completely covering compound completely covering
the heating element and the sensor wire. Using a rubber float spread the thin-set over the floor in the same direction as the STRATA_HEAT
Wire. Ensure that the space between the STRATA_HEAT Wire is filled. Allow this layer to dry completely.

Apply a second layer of thinset or adhesive and lay the tiles as usual. The required minimum total for both layers is 3/8" (9.5 mm) of
thinset or adhesive.

When deciding between the single layer or the double layer method you should consider the following:

We do NOT recommend the single layer method if you will install mosaics or a combination of tiles of different sizes.

If this is the first time installing underfloor heating the double layer method is highly recommended.

Waiting Period: Ceramic tiles and stone installations require 1 to 3 weeks for the thinset to cure. Do not switch on the

STRATA_HEAT floor heating system until you have allowed the thinset material to fully cure. Failure to do so will result in damage to the
system and cause the thinset to become brittle.

Carpet, Vinyl or Laminate Flooring

Embed the STRATA_HEAT Wire in a layer of self-leveling compound and let it dry. Ensure that the heating cable are covered with a
minimum of 3/8" (9.5 mm) of self-leveling compound.

Note : The under floor heating cables are NOT approved for direct contact with combustible material. The STRATA_HEAT Wire MUST
always be embedded in thinset / cement mortar / cement based adhesive glue / tile adhesive before installing floating wood or
laminate floors.

FLOOR COVERINGS – TILES & STONE

19

STEP 1: Wooden Sleepers / Strips Installation:

Fix the wood sleepers (recommended 1" / 25 mm wide x 3/8" / 9.5 mm thick or similar) perpendicular to the planned direction of
hardwood board.

On the plywood subfloor leave a sufficient space at the end of each wooden sleeper to allow the cable to go from one section to the other.

The sleepers are fixed in such a manner that they create a gap between 12-16" (30.5-40.6 cm) between two sleepers in which the
STRATA_HEAT™ Wire can be installed. Cut a 1/2" (12.7 mm) groove into the sleeper to carry the cable from one gap to the next.

STEP 2: STRATA_HEAT™ Floor Heating System Installation:

Install the STRATA_HEAT Spacing Strips at both ends of the sleeper runs. For runs longer than 4ft (122 cm), install one or more fixing
strips in between to secure the cable at least every 45-50” (114-127 cm). Run the STRATA_HEAT Wire parallel to the STRATA_HEAT
Spacing Strips.

Now Install the STRATA_HEAT Wire into the gap which was created by the sleepers.

Carefully return the cold tail lead to the junction box or the STRATA_HEAT Thermostat alongside the STRATA_HEAT Wire and wooden
sleepers, if required.

STEP 3: Install the floor sensor

Place the probe wire containing the capped sensor evenly between two STRATA_HEAT Wire loops at least 12" (305 mm) from the wall
into the heated area. At no time should the probe wire cross the STRATA_HEAT Wire.

STEP 4: Covering of the STRATA_HEAT Floor Heating System

Once the STRATA_HEAT Wire(s) have been laid, the system should be covered by self-leveling or dry-pack compound up to the sleeper’s
height. Do Not cover the sleepers.

STEP 4: Hardwood Flooring Installation:

Once the leveling compound or dry-pack has cured, the hardwood flooring may be installed by nailing it into wood sleepers. Be careful not
to place nails or staples near to the STRATA_HEAT Wire or power lead.

FINAL FLOOR FINISH – HARDWOOD FLOORING

1

2

3

4

5

1. Hardwood Flooring

2. Self-Leveling Compound

3. Sleepers

4. STRATA_HEAT™ Spacing Strips

5. STRATA_HEAT Wire

20

Ensure that there are no air gaps during application of the cement/mortar cement based adhesive/tile adhesive/thinset or self-leveling
compound.

Ensure the entire STRATA_HEAT™ Wire, factory splices and STRATA_HEAT Thermostat floor sensor are embedded in the cement mortar.
The choice and application of building materials should be in accordance with building materials manufacturer’s instructions.

Ensure that the correct maturity and curing times for drying of construction materials is followed before you powering ON the
STRATA_HEAT Wire.

Test the heaters before, during and after installation of the final floor finish. Record values in the control card on page 23 of this
manual.

Operating Tips

When first energized, the under tile STRATA_HEAT Wire may take up to 3 hours to fully warm your floor.

Energy consumption will vary depending on user preferences. For lower energy consumption set the STRATA_HEAT Thermostat to
optimum temperature setting.

Energy consumption can be minimized by turning the system OFF when floor heat is not required, but you will have to allow time for the
floor to warm up once the system is turned ‘ON’ again.

We recommend and supply STRATA_HEAT Thermostats with “set-back” option. This option will reduce the heat-up time to less than 1
hour by reducing the floor temperature and not actually turning off the system during the setback period(s).

Avoid placing thick mats / rugs / floor level furniture / mattresses on your heated floor, specially in the area where the sensor of a floor­sensing thermostat is located. These restrict the transfer of heat away from the STRATA_HEAT Wire and result in the floor area beneath
them being warmer than other areas.

Avoid mats with rubber or vinyl type backing, as these may decompose with heat and could stain flooring.

POINTS TO REMEMBER

21

CAUTION: TURN OFF THE POWER SUPPLY BEFORE TROUBLESHOOTING

If the system fails to heat, check that the GFCI (Ground Fault Circuit Interrupter) has not been tripped. If the GFCI has tripped on the
thermostat, this will be indicated with red “test” light on the thermostat. If the thermostat does not have a GFCI, check that the GFI
on the breaker panel has not tripped. Check for continuity and resistance level with an ohmmeter and compare the reading with the
resistance recorded on the UL label. Make sure the breaker or fuse is delivering power to the system. If the system fails to heat after
these checks, call your installer or LATICRETE

®

. You will need to locate the model information for the heater, either on the product
labels you kept, or based on an invoice. While incorrect grounding is the main cause for breaker tripping, please contact your installer to
review your installation more in detail.

CHECKING FOR BREAKS

Checking for resistance between the two conductor wires ensures there is no break in the cold lead conductor and the heating cable wire.

CHECKING FOR ELECTRICAL SHORT

In some rare instances, a sharp object can puncture the insulation around the heating cable, thereby allowing the electricity to flow to
ground. If this situation occurred it would immediately trip the GFCI (Ground Fault Circuit Interrupter).

Follow the steps on page 14 if the readings are not satisfactory, contact LATICRETE for further advice.

TROUBLESHOOTING

22

NOTES

23

CONTROL CARD

Record the resistance readings in the table below. For warranty purposes, the resistance table must remain with the end user.

STRATA_HEAT™

Wire model

number

Resistance (ohms) Insulation Resistance (M ohms)

Before During After Before During After

Installation Address:

Date of Installation:

Electricians Details

Name:

Signature:

Note: Ensure that this card is completed and signed by the authorized electrician and safely stored along with any floor plans.

24

FLOOR PLAN

25

WARRANTY

n

The most comprehensive assortment of tile and stone installation materials available for virtually any

tile or stone application around the world

n

LATICRETE® warranties cover any suitable tile or stone manufacturer’s product, allowing you to select

the appropriate product and finish you desire for your project with confidence

n

Customizable warranties are available to suit your specific project requirements

CERTIFICATIONS

LATICRETE materials are certified by independent laboratories throughout the world to meet or exceed
applicable industry standards/norms, including: DIN, EN, ANSI, AS, ISO, UEATC, JIS, ASTM, ABSAC,
and UPC® IAPMO and the ICC.

LATICRETE offers a comprehensive 100% labor and materials warranty
for tile and stone installations, underwritten by a AAA rated Global
Insurance Company.

Warranty

LIFETIME

*

26

NOTES

DS-044.6-0217

LATICRETE International, Inc. l One LATICRETE Park North, Bethany, CT 06524-3423 USA l 1.800.243.4788 l +1.203.393.0010 l www.laticrete.com

©2017 LATICRETE International, Inc. All trademarks shown are the intellectual properties of their respective owners.

Technical helpline:
203-393-0010 Ext 235