Install Instructions

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Fast Trak™ Installation Guide
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Overpour Guidelines
General Recommendations
When pouring the leveling compound or lightweight concrete, make sure
to comply with local code and always follow the overpour manufacturer’s
guidelines to comply with load and strength requirements.
Important! Do not turn on the radiant heating system until the
overpour is completely cured. Refer to the overpour manufacturer’s
instructions before turning the radiant heating system on to avoid
cracking or damaging the overpour.
Overpour for Fast Trak 0.5
For Fast Trak 0.5, the minimum overpour can be as low as ¼" (6mm) over
the panel knobs. However, it is important to check local codes which may
require thicker overpour. If the tubing is spaced more than 6" on center,
consider a thicker overpour to avoid thermal striping.
Overpour for Fast Trak 1.3i
For Fast Trak 1.3i, the minimum overpour should be ¾" (19mm) over the
panel knobs. Failure to follow the recommended ¾" guidelines risks screed
cracking or thermal striping.
Recommended Overpour Products
It is important to use an overpour product that is designed especially
for use with radiant floor heating systems to handle higher temperatures.
Uponor recommends the following overpour products for use with
Fast Trak.
• Allied Custom Gypsum AccuCrete® AccuRadiant®
• ARDEX TL WOOD™
• Hacker Industries, Inc. Firm-Fill®
• Maxxon Therma-Floor®
• United States Gypsum (USG) LEVELROCK® RH