Warmup Inslab Cable – INSLAB

Basic Installation of the Inslab Floor Heating Cable



Step 1

Prepare floor plan of the area requiring the slab heating system & note the area to be heated. It is advised that a floor plan is drawn up to determine the placement of the thermostat, heating cable and the sensor probe. This diagram should be kept for future reference.


Step 2

The fixing strips should be laid out perpendicular to the heating cable runs. These fixing strips must be secured to the insulation or the concrete floor using fixing nails or an adhesive. It is important to ensure there is no movement of the fixings.


Step 3

The fixing strips should be evenly spread across the floor at interval of 30” (0.75m). The fixing strips should be placed so as to leave a minimum of 4” (100mm) border all the way around the room.


Step 4

Examine the cable and test the resistance BEFORE, DURING and AFTER installation.


Step 5

The heating cable should then be laid up and down the room and clipped into the fixing strip. The cable spacing is determined by the product model. The cables should be spaced evenly at all times to ensure an evenly heated floor (minimum spacing is 2” (50mm). The cables should never touch or cross each other.


Step 6

The heating cable cold tail should be connected to the thermostat by a qualified electrician in accordance with NEC (USA). The heating cables should then be tested again BEFORE POURING the layer of cement. Record the readings in the notes section. Once laid, the heating cables must be covered with a minimum thickness of 1¹/₈” (30mm) of cement.


NEVER turn on your floor heating system unless it has been completely encapsulated in thinset or floor leveler and these compounds have had an opportunity to completely cure (at least 1 week) as directed in the installation manual that you received with your product. If you ignored this warning and activated your heating system without the wires being covered, you likely overheated them and will need replacements.


NOTE: Installation on Reinforcement Bars

Warmup In-Slab Cables are suitable for attaching to the reinforcing steel bars in concrete from a depth of, 1.5” to 3.0” below the surface.

Only one cold tail at one end exists, simplifying the installation. The heating cable must not be cut or shortened and must be GFCI protected.

Once the on-center-spacing (OC) has been worked out the cables can be tied to the re-bars using plastic cable ties.

Care must be taken not to tighten the ties too much, causing damage to the cable. Any number of ties can be used ensuring that the on-center-spacing is maintained.

For ease of installation, cable lengths can be determined to match the rebar spacing.

For an 8” rebar spacing (200mm), measure the area to be heated in sq ft, multiply this by 12 and then divide by 8”. This gives you the length of cable in feet.