Underlay-C
LATEX MASTIC UNDERLAYMENT
DESCRIPTION:
A trowel grade underlayment consisting of a polymer modified cementitious
filler. Underlay-C is mixed with water on the job site and installed
by trained mechanics to provide a uniform subsurface suitable to
receive a finished overlay in 6-8 hours (depending on climatic conditions).
USE:
To provide an acceptable surface for floor coverings such as vinyl,
resilient tile, carpet, stone, ceramic and quarry tile. It is also
used to repair concrete surfaces and to provide slope for drainage
under exterior elastomeric deck coatings.
ADVANTAGES:
• Easy to install by screed or trowel.
• Excellent bond to concrete, wood & metal with minimum
preparation.
• Cures in 6-8 hours.
• Crack resistant and fire retardant.
• Good thermal and acoustical insulating properties.
• Trowels to a smooth and uniform finish.
• May be installed from 0" to 3". Consult manufacturer
for elevations over 3" thick.
LIMITATIONS:
• Additional sand or rock should not be added to the mix.
• Powder should not be exposed to moisture prior to application.
• Not intended as a finished surface.
CONSIDERATIONS
FOR INSTALLATION:
When covering wood sheathing, use stapled expanded metal lath. Concrete
should be free of dirt and laitence.
Heavier fills (over 11/2") may produce minor hairline cracks.
This will not affect performance of the product.
INSTALLATION:
Underlay-C should be mixed as recommended by the manufacturer. Underlayment
can be installed from the “needed thickness” down to
a feather-edge. It can be installed over most clean, dry subsurfaces,
and can normally be covered or used within 6-8 hours.
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