Is it alright to used over cement block?

Name: Laticrete LHT Plus Modified Tile Mortar - 50 lb bag
Brand: Laticrete
SKU: L-LHT_PLUS
Price: 19.48 USD
Availability: InStock

Yes, Laticrete shows that this product will adhere to cement block.

Laticrete LHT Plus Modified Tile Mortar | Large and Heavy Tile Polymer Modified Thin-Set

Details

Laticrete LHT Plus Modified Tile Mortar — Large and Heavy Tile Polymer Modified Thin-Set

Laticrete LHT Plus Modified Tile Mortar is a professional-grade polymer modified thin-set specifically engineered for installing large and heavy ceramic tile, porcelain tile, marble, and natural stone. Designed as a one-step installation solution, it requires only water for mixing while delivering strong adhesion and dependable performance across a wide range of substrates.

The high-build formula supports tiles up to 3/4" (19 mm) thick without shrinkage, helping installers correct surface irregularities while maintaining excellent bond strength. Its performance characteristics help reduce lippage and provide consistent coverage for large format installations on both floors and walls.

Suitable for interior and exterior projects, LHT Plus offers versatility, durability, and efficiency for professional tile installations where heavy materials and reliable performance are essential.

Key Features and Benefits

Large and Heavy Tile Support — Engineered to handle large format and heavy tiles while minimizing lippage and improving installation stability
One-Step Polymer Modified Formula — No admix required—simply add water for a reliable, high-performance installation system
High Build Without Shrinkage — Can be built up to 3/4" (19 mm) without shrinkage or extended set-up issues
Interior and Exterior Versatility — Suitable for floor and wall applications in both interior and exterior environments
Strong Bond Performance — Exceeds ANSI A118.4 and ANSI A118.11 standards for dependable adhesion on a variety of substrates
Approved for Exterior Glue Plywood (Interior Use) — Provides flexibility and performance for interior plywood substrate installations

Suitable Substrates

Brick Masonry
Cement Backer Board
Cement Mortar Bed
Cement Plaster
Cement Terrazzo
Concrete
Concrete Masonry
Hydro Ban Board
Non-Water Soluble Cut-Back Adhesive
Properly Prepared Vinyl or Other Resilient Tile
Ceramic Tile and Stone
Exterior Glue Plywood (Interior Only)
Gypsum Wallboard (Interior use only, non-wet areas)

Applications

Large format ceramic and porcelain tile installations
Marble and natural stone installations
Interior and exterior floor installations
Interior and exterior wall installations
Large and heavy tile projects
Residential and commercial tile applications

Installation:

All surfaces should be between 40°F (4°C) and 90°F (32°C) and structurally sound, clean and free of all dirt, oil, grease, paint, concrete sealers or curing compounds. Rough or uneven concrete surfaces should be made smooth with Latex Portland Cement Underlayment to provide a wood float (or better) finish. Dry, dusty concrete slabs or masonry should be dampened and excess water swept off. Installation may be made on a damp surface. New concrete slabs shall be damp cured and 28 days old before application. There is no minimum cure time for concrete slabs when mortar is mixed with latex additive. All slabs must be plumb and true to within 1/4" (6 mm) in 10 ft (3 m). Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Do not cover expansion joints with mortar.

Approximate Coverage:

Trowel Size	ft²	m²
1/4" x 1/4" (6 mm x 6 mm) notched trowel	80 – 95	7.4 – 8.8
1/4" x 3/8" (6 mm x 9 mm) notched trowel	60 – 70	5.6 – 6.5
1/2" x 1/2" (12 mm x 12 mm) notched trowel	40 – 47	3.7 – 4.4