If you have radiant heat and are planning a
ceramic floor tile
installation, then understanding the function of membranes will
certain be beneficial. This article will teach you about various
membranes in conjunction with radiant heat, so that your floor tile
installation will be done properly.
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There have been many tragic ceramic floor tile installation
disasters by using the wrong membranes or none at all. If the
membranes and/or bonding mortars are not compatible your bond will
be lost and problems will occur.
With a floor tile installation make sure your membranes meet current
ANSI standards and that manufacturers instructions are followed
properly.
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With floor tile installations, membranes are used for a variety of
reasons, each having a specific purpose, such as moisture vapor
emission membranes, cork underlay, peel and stick membranes and
liquid or trowel applied membranes.

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A load bearing, bonded, uncoupling membrane is also a full coverage
membrane, but it’s made of thicker material than the anti-fracture
membrane. The air cavities that are pressed into its surface allow
for lateral movement.
A cleavage membrane is not bonded to the concrete. The function of
this membrane is to separate the tile assembly from the concrete and
isolate the wire-reinforced mortar bed and the ceramic floor tile
installation from any instability in the wood or concrete sub-floor.
A crack isolation membrane is bonded to the sub-floor to cover
existing shrinkage cracks and must cover three times the width of
the floor tile used, with a minimum width of 6 inches.
An anti-fracture membrane is also bonded to the sub-floor, but this
membrane needs to fully cover the sub-floor in order to protect
against shrinkage, moisture and expansion and/or contraction of the
concrete.
With a radiant heat system a moisture barrier is important in
controlling moisture and stopping liquid from passing through.
Always consider all of the options, because the improper use of a
membrane may trap moisture and cause condensation.
Just remember that when you’re doing a ceramic floor tile
installation make sure that you use the correct membrane especially
if you have in-floor radiant heating otherwise you could end up with
cracked tile and grout and an expensive repair bill.
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