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Q & A Floor Heating
HARDIBACKER
Hardibacker is available in 1/4” thickness.
Use minimum 5/8" exterior grade plywood or 3/4" exterior grade OSB, complying with Local Building Codes and NSI A108.11, over joists. Joists' spacing not to exceed a maximum of 16" on center.
Deflection must not exceed /360 of the span, including live and dead design loads.
Do not use glue between grooves of tongue-and-groove plywood to allow for expansion and contraction of plywood.
HardiBacker must be set into a fresh bed of latex or acrylic modified thinset (complying with ANSI A118.4)(OR) dry-set mortar (use between subfloor and backerboard only) (complying with ANSI A118.1)
Approved fasteners are Minimum 1-1/4" long corrosion-resistant roofing nails (OR) minimum 1-1/4" No. 8 by .323" head diameter ribbed counter sinking head, corrosion-resistant screws.
Apply a minimum of 3/32" thick dry-set mortar or modified thinset to subfloor. Embed HARDIBACKER ® sheets firmly and evenly in the wet mortar. Leave 1/8" gap between sheet edges. Using the printed dots as a guide, fasten HARDIBACKER ® sheets with proper nails or screws (as listed in "Materials Required") every
8" over the entire surface. Keep the fasteners between 3/8" and 3/4" from sheet edges and 2" in from sheet corners.
Set fastener heads flush with the surface without overdriving.
DUROCK
When 1/2" or 5/8" Durock is used in underlayment applications can be applied over 5/8" exterior grade plywood or 3/4" oriented strand board (osb) using a latex modified thinset. Use a 1/4" square-notched trowel to spread the mortar.
Place underlayment with joints staggered from subfloor joints. Leave about a 1/8" gap at all edges and fasten underlayment with 1-1/2" hot-dipped galvanized roofing nails or 1-1/4" Durock Brand Wood Screws spaced 8" in both directions. Try not nail or screw into joists.
Use fiberglass mesh tape on all the seams and then smoothed with latex modified thinset.
Warmup Heated Flooring USTAT Thermostat
A programmable timer thermostat controls your Warmup Undertile Heater.
The thermostat controls the floor temperature via a sensor that is fitted
underneath the tiles. The floor probe sensor relays the floor temperature back
to the thermostat.
The thermostat has a built in timer function, with four timer settings,
that can switch on the Undertile Heating automatically in the morning, then
switch off when you go to work and switch on again in the evening.
The thermostat has a manual feature which allows you to maintain a
constant temperature but we recommend use of the timer settings for the most
cost effective and efficient method of running the undertile heating system
(see Heating section for more information).
The thermostat has an on/off switch to put the thermostat in sleep mode
when it is no longer required (i.e. Summer). This will not affect the clock or
programming.
The vacation mode will maintain a lower vacation setback temperature
during prolonged absence.
The thermostat also has an in built GFCI (Ground Fault Circuit
Interupter) that provides complete electrical protection.
The thermostat requires a 4" x 4" deep square box with a single gang mud
ring.
For detailed instructions regarding the installation and programming of
the Warmup thermostat, please visit the Library-Downloads
section of this website. Characteristics
• Model : USTAT (120 VAC)
• Supply : 120 VAC, 50/60 Hz
• Load : 16.7 A maximum (resistive only)
• Power : 2000 watts (NI) @ 120 VAC
• Ground fault circuit interrupter (GFCI): 5 mA TRIP LEVEL
• Approvals : CSA / C, US • Display range :0 to 60 °C (32 to 140 °F)
• Setting range : 5 to 40 °C (40 to 104 °F)
• Comfort default setting : 28 °C (82 °F)
• Econo default setting : 18 °C (64 °F)
• Vacation default setting : 10 °C (50 °F)
• Storage : -20 to 50 °C (-4 to 120 °F)
Warmup Radiant Heat Design
Wire Design
Warmup’s radiant heating element is designed within three parameters:
THIN
We use high-grade insulation materials and production tolerances to ensure that the cable is as thin as possible, so that it will not raise your floor levels.
TOUGH
The high-grade insulation materials and the complete coverage of the earth braid ensures that the heating element, despite being small, is very tough. We also use a stranded conductor to allow for slight lateral movements as the floor settles over time.
SAFE
The element is approved by both UL and the European equivalents. The cable design has been over engineered to allow for those accidental knocks that occasionally happen on a construction site. The incorporated ground sheath combined with the GFCI built-in to our thermostats gives complete protection against electric shock in the event of someone drilling though the tiles with the heater switched on.
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