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Page: 13
DFT Installation Instructions
Appendix
A) Installations Under Tiled Showers
Cables can be installed in tiled showers or other bathroom-like areas, although it is recommended
that you check with your local electrical inspector first to verify that this application is allowed in your
jurisdiction� Waterproof membranes are usually used in these areas and in other areas where large water
spills may occur� These membranes are typically composed of a waterproof thin film (max� 0�080” thick)�
These membranes can be used in conjunction with the Warm Tiles systems by laying the cable on the
floor first, then covering with a scratch coat of cement-based underlayment� The waterproof membrane
is then installed on top of the scratch coat, and the flooring completed in the usual manner� Heat from
the cables, which typically operate at a temperature of about 104 °F (40 °C) will usually not aect
moisture barriers, consult with the manufacturer to be certain�
B) Installations With Uncoupling Membranes
Uncoupling membranes are used to separate the tiling layer from substrate and therefore, help prevent
the formation of cracks in tile and stone floors� In many cases the uncoupling membranes are pre-made
with channels that allow for quick and easy installation of heating cable within the membrane� These
uncoupling membranes eliminate the need to use the cable strapping accompanying the cable sets�
DFT cable may also be installed in conjunction with many of these membranes� Follow the installation
instructions below when installing the DFT cable in applications where uncoupling membrane is utilized�
!
CAUTION
Use only uncoupling membranes that are rated for 90°C or greater and are approved
by the manufacturer for having heating cable installed within them� If you are unsure about
the membrane’s rated temperature or ability to accommodate heating cable, please consult with
the membrane’s manufacturer�
Prepare Uncoupling Membrane
A) Follow instructions “Installing Electrical Connection Box (ECB)” above�
B) Follow instructions “Installing Uncoupling Membrane” below�
C) Follow instructions “Verifying Size of Heated Area“ and “Planning Floor Installation” above�
D) Skip instructions “Installing Plastic Strapping” above and replace with instructions “Prepare
Uncoupling Membrane for Cable Insertion” below�
E) Follow instructions “Verifying Resistance of Heating Cable and Sensor” and “Routing
Cold Lead” above�
F) Skip instructions “Installing Cable” above and replace with instructions “Lace Cable Through
Uncoupling Membrane” below�
G) Follow the remaining instructions after the “ ‘HALF OF CABLE’ Marker” section above�
Installing Uncoupling Membrane
Follow the instructions provided by the manufacturer of the uncoupling membrane� This typically
requires a base layer of mortar to be applied to the floor and then the membrane immediately placed
onto the floor over the mortar� Do not apply top layer of mortar over membrane at this time� Allow base
layer of mortar to dry�
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