TEC® PermaLastic® LHT Polymer Modified Mortar


TEC® PermaLastic® LHT Polymer Modified Mortar is a one-component, Portland
cement based tile mortar designed to set large format ceramic and stone tile
firmly in place, without lippage or shrinkage, for interior and exterior floor
applications where the embedded thickness is between 3⁄32"-1⁄2" (2.4 mm-12 mm).

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PermaLastic® LHT Mortar may be used for the installation of porcelain tile,
ceramic tile, quarry tile, non-moisture sensitive natural stone*, cement tile, pavers
and high bottom lugged tile, and uncoupling membrane applications.
* All natural stone should be tested to be sure discoloration does not occur.

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Recommended Tile Type

  • Large Format
  • Ceramic
  • Porcelain
  • Natural Stone
  • Quarry Tile
  • Cement Tile
  • Paver

ANSI Specifications

  • A118.11
  • A118.4T

Set Speed

  • Standard


Recommended Substrates

  • Gypsum wallboard
  • Water resistant gypsum wallboard (greenboard)
  • Cured concrete, cured mortar beds, brick and masonry
  • Existing ceramic tile and natural stone primed with TEC Multipurpose Primer(provided existing flooring is well-bonded
    to an approved substrate)*
  • Adhesive residue (except tacky or pressure-sensitive
  • Glass mat backerboard
  • Cementitious backer units (CBU)
  • APA Grade Trademarked Exposure 1 Plywood [underlayment grade or better, two
    layers, 11/8" (28 mm) total minimum thickness, interior floors only]
  • Vinyl composition tile, asphalt tile, linoleum or non-cushioned vinyl sheet
    goods (provided such surfaces are single layered, well-bonded to an approved
    substrate and properly prepared)
  • Uncoupling membranes

*Prime first with TEC® Multipurpose Primer

Recommended Applications

  • Interior
  • Exterior
  • Floor
  • Wall

Conforms with LEED v4 low emitting interiors. Compliant with (CDPH) Standard Method v1.2 VOC Emissions.

Product Features

• Ideal for large & heavy tile and stone
• For floors and walls
• Bonds to a variety of surfaces, including plywood
• Interior/exterior
• Exceeds ANSI A118.4, A118.4T and A118.11 specifications
• Approved for setting and tiling under and over uncoupling membranes
• Contributes to LEED® project points
• VOC 0

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