Mapei UltraFlex-1 White Mortar

Size: 50lb. |

SKU: 100037100

$12.49 /piece

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To ensure you have enough material for your project we recommend adding an extra 10% to cover necessary cuts and accidental breaks or spills during installation. We offer Free in-store returns in case you need to return extra material.
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Additional Information


Product Length
Product Width
Tile Setting Materials
Product Type
Modified or Unmodified
Color/Finish Family
Mold/Mildew Resistant
Indoor / Outdoor
Indoor/ Outdoor
UV Stable
Commercial / Residential Use
Use Over Cement Backer Board
Use Over Exterior Grade Plywood
Use Over Concrete
Flooring Type
Tile & Stone
Additive Required
Not Required
Dry Time
24 hours
Pot Life
2 hours
Application Temperature Range
40-95 deg. F/ 4-35 deg. C
1 Year
LEED Point Eligible
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Product Details

Mapei UltraFlex-1 White Mortar is a 50lb. bag of standard-grade, single-component, polymer-modified thin-set mortar for most interior and exterior installations of tile. This mortar has an above average content of unique dry polymer, resulting in good adhesion to the substrate and tile.

•Polymer-enriched for performance
•Good bond strength with plywood

•Most interior/exterior residential installations on floors and walls
•Most interior/exterior commercial installations on floors
•Most interior commercial installations on walls
•Installation of ceramic and porcelain tile, quarry tile, pavers, Saltillo tile, and most types of marble, granite and natural stone

Prior to beginning your project, please consult the manufacturer's installation guide

Blogs & Videos
Install & Product Documents
Customer Questions & Answers

We are building outdoor kitchen with natural austin stones and looking for white type N mortar mix. Is this the right mortar? Please confirm

Asked by: Sandhya
A great choice for use with stone is the Mapei Ultraflex LFT.
Answered by: Answer
Date published: 2021-03-19

I am installing 12 X 24 ceramic tiles on shower walls, the walls are concrete board covered in Mapei Aquadefense, what mortar or thinset should I use?

Asked by: Showeremodel
We recommend using the Mapei Ultraflex LFT SKU 100037100 or an item in the Keraflex line ( These mortars are suitable for this size tile.
Answered by: Answer
Date published: 2021-04-13

I am installing marble pieces over old brick around a fireplace opening. The old brick is stable, but not perfectly flat. The mortar joints have receded (flaked off) a bit over time. Should I parge with mortar first, or multiple coats of thin set. thank

Asked by: Tim
A substrate should always be clean, flat, level/plumb, and ready for tile installation- you'll want to make sure this is done as your prep before you install. UltraFlex 1 may not be the best option to use with marble; a better choice may be using an epoxy adhesive after using a primer. Some good choices would be the Ultraflex LFT or Keraflex Plus.
Answered by: Answer
Date published: 2021-02-08

Is this product a eproxy grout ?

Asked by: MT
Ultraflex-1 is a polymer-modified thin-set mortar for most interior and exterior installations of tile. You can view our selection of grouts here:
Answered by: Floor & Decor Q&A
Date published: 2020-05-27

can this be used for shower tile install

Asked by: mark
Yes, UF1 is fine for tile installation in a shower as long as you are not installing large format tile or glass tile. For those installations, we recommend Ultaflex LFT, LHT & Adesilex P10 Mosiac & Glass tile Mortar. Please note that UF1 is fine for intermittently wet areas (shower) but should not be used for submersion in water (pool). Please refer to all manufacturer’s recommendations for installation.
Answered by: Floor & Decor Q&A
Date published: 2020-05-07

Can I use this with mosaic 1 inch tile on the floor?

Asked by: Kb
UltraFlex-1 can be used on floor for tiles up to 15 x 15. We recommend reviewing the technical data sheet for more information about your specific installation requirements. For glass mosaics we recommend using Adesilex P-10. Please note that if any one side of the glass mosaic is larger than 6in Keraply should be used in place of water.
Answered by: Floor & Decor Q&A
Date published: 2019-10-09

Can I use Ultraflex 1 with granite tiles?

Asked by: Mauro
We recommend referring to the Technical Data Sheet under "Installation & Product Documents." Ultraflex is approved for use with "most types of marble, granite and natural stone," so please review the data sheet for the proper requirements. Ultraflex 1 can also be installed with tiles up to 15" x 15". If you have additional questions or concerns, please don't hesitate to reach out to our Customer Care Team at 877-675-0002.
Answered by: Floor & Decor Q&A
Date published: 2020-05-05
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