Series 242

Ultra-Tread S

Generic Type

Polyurethane Modified Concrete

Common Usage

Ultra-Tread S is a low odor, slurry applied floor topping designed for monolithic applications in abusive service areas. It provides superior performance to other flooring systems such as acid brick, quarry tile and most polymer flooring systems. Designed for indirect use in food and beverage facilities, pharmaceutical and processing areas, commercial and restaurant kitchens or anywhere a durable floor topping is required. Provides excellent chemical resistance and withstands thermal shock due to hot liquids and aggressive cleaning procedures. Areas may be quickly returned to service within hours of installation, depending on temperature and humidity. Ultra-Tread S is a self-priming base coat that can be applied to 10 day old concrete. It can withstand moisture vapor transmission up to 20 lbs (per ASTM F 1869) and relative humidity up to 99% (per ASTM F 2170). This unique self-leveling mortar system is typically applied by trowel or screed, backrolled with a loop roller and broadcast to refusal with 30/50 mesh aggregate, colored quartz or decorative flake. Note: Series 242 can be applied as a stand-alone mortar. If topcoating, the mortar, while still wet, must be broadcast to refusal with aggregate, color quartz or decorative flake typically completed within 10 to 15 minutes of application. Color quartz and/or decorative flake systems will require an additional broadcast layer using Series 222, 224, 237, 238 or 256 clear to obtain a uniform appearance and texture before applying the desired clear finish coats. This will typically result in a total system thickness of 3/16"-3/8".

Special Qualifications

Formulated with antimicrobial properties. Does not support bacteria or fungal growth. Contact your Tnemec representative for specific test results.

Series 242 was tested in accordance with, and passed, the California Department of Public Health CDPH/EHLB/Standard
Method Version 1.1, 2010 emissions testing and meets qualifications of LEED v4, Collaborative for High Performance
Schools, and Living Building Challenge.

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Series 237, 238, 239, 246, 247, 248, 252SC, 256, 280, 281, 282, 284, 285, 286, 290, 291, 294, 295, 296, 297. Note: These topcoats may only be used when recommended aggregate has been broadcast to refusal into the wet Series 242 or the cured surface of the Series 242 has been cleaned and thoroughly abraded by sanding or grinding prior to topcoating. Note: If Series 247 (tinted), 248 (tinted), 290, 291 or 297 is selected for the finish coat over a broadcast system, a grout coat of Series 237 or 238 (tinted), 256 (tinted), 280 or 281 is required. If Series 247 (clear), 248 (clear), 285, 294, 295 or 296 is selected for the finish coat over a broadcast system, a grout coat of 237 or 238 (clear), 256 (clear) or 284 is required.

Curing Time

Temperature Min. Recoat Light Traffic Place In Service †
75°F (24°C) 6 hours 8 hours 12 hours

† For full resistance to chemicals and steam cleaning, 24 hour cure is needed.
Curing time varies with surface temperature, air movement, humidity and film thickness. Note: For faster curing and low temperature applications, add No. 44-714 Ultra-Tread Accelerator, see separate product data sheet for cure information.



Number of Components

Four—Liquids: Part A & Part B, Aggregate: Part C, Colorant

Volume Solids

100% (mixed)

Recommended DFT

1/8" to 3/16" (3 mm to 5 mm). Series 242 can be applied as a stand alone mortar (neat) at 1/8" to 3/16" (3 mm to 5mm). Broadcasting with aggregate to refusal at 1/8" neat will yield a total thickness 3/16" (5 mm), at 3/16" (5 mm) neat will yield a total thickness 1/4" (6 mm). Important: Series 242 should not exceed 1/2" (13 mm) thickness when applied neat. Refer to coverage rates table for more information. Note: Exceeding the recommended coating thickness may result in blistering of the product. Avoid excessive coating thickness by thoroughly filling voids, depressions and cracks with recommended filler or surfacer prior to Series 242 application.

Theoretical Coverage

47 sq ft per small kit at 1/8" 31 sq ft per small kit at 3/16”

Volatile Organic Compounds

Parts A & B: 0.16 lbs/gallon (19 grams/litre)
Parts A, B & C: 0.07 lbs/gallon (8 grams/litre)




Series 242 (extended with aggregate) or Series 243, 244. Patching should be allowed to cure a minimum of six hours prior to placement of the Series 242 to avoid blistering or doming of the Series 242. Series 215, or 201 mixed with fumed silica, may be used for small patches or crack repairs. Certain high-early strength, cementitious repair mortars are also acceptable. Contact Tnemec for further qualifications.


Series 222, 223, 224, 237, 238, 239, 252SC, 256. Note: Series 242 must be broadcast to refusal with aggregate, colored quartz or decorative flake if topcoating. Broadcast aggregate or colored quartz at an approximate rate of 0.5 lb per sq ft and decorative flake at an approximate rate of 0.25 lb per sq ft. The Series 242 base coat will account for approximately 1/8"-3/16" of the desired system thickness.

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