AutomotiveBathroomBuilding SuppliesCleaning SuppliesElectricalFlooringHardwareHeating & CoolingHoliday DecorationsHome DecorWindow TreatmentsKitchenLawn & GardenLighting & Ceiling FansMoulding & MillworkOutdoorsPaintPlumbingSmart Home, Security, Wi-FiSports & FitnessStorage & OrganizationToolsWindows & DoorsAppliancesAnimal & PetcareRefrigeratorsWashers & DryersBest SellersRentalGift CardsInstallationsCooktop InstallationDishwasher InstallationGarbage Disposal InstallationOver The Range Microwave InstallationRange Hood InstallationRange InstallationRefrigerator InstallationWall Oven InstallationWasher And Dryer InstallationBathroom Remodel InstallationCustom Shower Door InstallationLSink InstallationToilet InstallationVanity InstallationBlinds And Shades InstallationInterior Shutter InstallationWindow Treatment InstallationDoor InstallationGarage Door InstallationExterior Door InstallationWindow InstallationEV Charger InstallationStandby Generator InstallationCeiling Fan InstallationSmart Home InstallationSolar Power InstallationArtificial Grass InstallationDecking InstallationFence InstallationGutter InstallationPlayset InstallationRoof InstallationShed InstallationSiding InstallationSolar Power InstallationCarpet InstallationHardwood Floor InstallationLaminate Flooring InstallationTile Floor InstallationVinyl Floor InstallationHVAC InstallationHVAC ServiceInsulation InstallationWater Heater InstallationWater Treatment InstallationBathtub To Shower Conversion ServicesAccessible Home Virtual AssistantWheelchair Ramp InstallationHome Accessibility InstallationHome Organization InstallationAppliance InstallationBacksplash InstallationCabinet InstallationCabinet RefacingCountertop InstallationGarbage Disposal InstallationKitchen Design ServicesKitchen Sink Installation
Deals by Department
Shop All
More Ways to Save
Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.
1k+ bought last week
MAPEI UltraFlex LFT Rapid White Thinset/Medium bed Tile Mortar ( 50 Pound(s) )
Item #5445746 |
Model #2904936
4.8
$39.98
Color/Finish Family: White
MAPEI UltraFlex LFT Rapid White Thinset/Medium bed Tile Mortar ( 50 Pound(s) )
4.8
$39.98
Actual results may vary in color from screen representation; In-use/lifestyle images - accessories not included
Best Price. Guaranteed
Find a lower price on an exact item? We'll match it. Some exclusions apply.
Learn MoreUltraflex LFT Rapid is a premium, rapid-setting, non-sag, large-and-heavy-tile mortar (formerly known as “medium-bed mortar”) and thin-set mortar for large and heavy tile and stone for interior/exterior floor, wall and countertop installations.
Polymer enriched for high performance and deformability
Non sag formula for large format and heavy tile and stone in wall applications
Non slump for large format and heavy tile and stone in floor applications
For thicker bond coats from 3/32" to 1/2" (2.5 to 12 mm)
Smooth and creamy consistency makes it easy to apply.
Allows grouting in 3 to 4 hours
CA Residents: Prop 65 Warning(s)
General | |||
|---|---|---|---|
Color/Finish Family | White | Use Location | Indoor/Outdoor |
Manufacturer Color/Finish | White | Unit of Measure Quantity | 50 |
Product Type | Powder | Unit of Measure | Pound(s) |
Series Name | UltraFlex LFT Rapid | Drying Time (Hours) | 3 |
Type | Thinset/Medium bed | Required Additional Components | Water |
Package Quantity | 1 | ||
Dimensions | |||
|---|---|---|---|
Maximum Coverage Area (Sq. Feet) | 90 | Tile Size | All sides 15-in or greater |
Features | |||
|---|---|---|---|
Freeze Resistant Post Installation | Yes | Unmodified | No |
Rapid Setting | Yes | Sold As | Bag |
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | |||
Warranty | |||
|---|---|---|---|
Warranty | 1-year limited | ||
Compatibility | |||
|---|---|---|---|
For Use with Fireplace Exteriors | Yes | For Use with Garage Walls | Yes |
For Use with Waterproofing | Yes | For Use with Patios | Yes |
For Use with Kitchen Backsplashes | Yes | For Use with Pools | Yes |
For Use with Shower Walls | Yes | For Use with Shower Floors | Yes |
Use Over Cement Backer Board | Yes | For Use with Porcelain | Yes |
Use Over Concrete | Yes | For Use with Vinyl Floors | No |
Use Over Exterior Grade Plywood | Yes (no additive required) | For Use with Large Format Tile | Yes |
For Use with Bathroom Walls | Yes | For Use with Ceramic | Yes |
For Use with Bathroom Floors | Yes | For Use with Stone | Yes |
For Use with Kitchen Counters | Yes | For Use with Glass | No |
For Use with Garage Floors | No | ||
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 30111500 | ||
Check out the Best Selling Mortar on Lowes.com
Review
31 Reviews
2 Star
0%
1 Star
0%
88% Recommend this product
Ratings may include incentivized customer reviews.
What Customers Are Saying
The product is praised for its fast-setting and easy-to-use properties. Reviewers highlight the quick drying time, which allows for efficient tile installation, though it requires working quickly before the mortar sets. The product is described as having a smooth application, strong adhesion, and the ability to hold heavy tiles in place. It is suitable for wall and floor applications, including bathrooms and outdoor areas, and has been recommended by professionals.
Customer review summary generated by AI, including incentivized reviews.31 Customer Reviews
Fast Setting
Sets fast so only mix what you can use in 45min. Easy cleanup with warm water.
Was this Review Helpful ?
Set fast
Adhered perfectly, set fast, easy to use. Great for wall applications!
Was this Review Helpful ?
Smooth application
Easy to use. Once mixed it applies smoothly. Made our fireplace diy project go great.
Was this Review Helpful ?
great working time
used to use the ultra flex 2 but no longer seeing it for sale went to this for some 16x24 inch stone tile it is a comparable product great mix life and sets up nice no issues
Was this Review Helpful ?
easy to use
was easy to work with, just enough time to get a few tiles down and then quickly dried so grout could be applied
Was this Review Helpful ?
Works as advertised. Will purchase again.
Appreciate item's mixing consistency & performance. Holds the 12 x 24 excellent. I am a professional Tilesetter and admire Mapei Rapid for allowing me to expedite and grout.
Was this Review Helpful ?
easy to mix and use.
easy product to work with. mixes easily and spreads easily.
Was this Review Helpful ?
Fast drying
This thinset did a great job holding up the tiles, but it dries extremely fast.
Was this Review Helpful ?
Fast-setting mortar for smaller areas.
I needed to quickly fix a spot where tiles were broken and the floor was a little uneven. This perfectly handled the job. I was able to build up the mixture, coat everything well and get it replaced. Just keep in mind that it sets pretty quick, so you'll need to hustle. Prep everything in advance and only bite off what you know you can chew.
Was this Review Helpful ?
4 Questions
4 Questions
casjab on October 12, 2025
1
Answer
dabberio on May 25, 2025
1
Answer
chuck on May 5, 2025
1
Answer
Can I use this in between cement board and a granite slab for my fireplace hearth?
Chris on November 10, 20250
Answers