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Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
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Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
ARDEX S 1-K is an easy-to-use, single-component, load-bearing waterproofing compound that produces a flexible, positive-side waterproof coating for all common interior building substrates requiring protection from topside water exposure that could damage tile installations.
Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail
Item #: 41405220

Ardex S 1-K Crack Isolation Liquid Waterproofing Membrane 1 Gal Pail

87% of respondents would recommend this to a friend

Item #: 41405220

LSL 1770

Price Details

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*All items will import from US

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Order now and get it around Wednesday, September 23
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ARDEX S 1-K is an easy-to-use, single-component, load-bearing waterproofing compound that produces a flexible, positive-side waterproof coating for all common interior building substrates requiring protection from topside water exposure that could damage tile installations.
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What Stands Out

Single-Component Formula
Ardex S 1-K's easy-to-use single-component design eliminates mixing, ensuring hassle-free application while providing consistent quality across all surfaces.
Flexible & Waterproof
This liquid membrane adapts to structural movements, maintaining waterproof integrity while preventing cracks, perfect for interior floors and walls under varying conditions.
Load-Bearing Capability
Designed as a durable flooring underlayment, Ardex S 1-K supports heavy loads, offering exceptional strength and reliability for all types of flooring installations.

Product Details

Shop for ARDEX S 1-K One-Component Waterproofing Crack Isolation Liquid Membrane at Ubuy Lesotho. Get the best deals and offers on waterproofing products for your home or construction project.
Brand NameArdex
UPC709850007794
Number of Packs1
Unit Count128 Fluid Ounces
Item HighlightSingle-Component Flexible Premixed Load-Bearing Compound - for Interior Floors & Walls Flooring Underlayment
Number of Items1
ManufacturerARDEX
ModelS 1-K
Part NumberS 1-K
Water Resistance LevelWaterproof
Item FormLiquid
Compatible MaterialStone
Style NameProtection
Surface RecommendationFloors,Walls
Material TypePolyurethane
MaterialPolyurethane
BrandArdex
StyleProtection
Item Weight10 lbs (4.54 kg)

Who Should Buy?

Suitable For
  • Homeowners

    Ideal for homeowners looking to waterproof and protect basement or bathroom floors from moisture and cracks.

  • Contractors

    Perfect for contractors requiring a reliable, easy-to-use membrane for various flooring and wall projects.

  • DIY Enthusiasts

    Great for DIY enthusiasts wanting to tackle home improvement projects with a user-friendly, premixed solution.

Not Suitable For
  • Outdoor Use

    Not suitable for exterior applications as it is designed primarily for indoor flooring and wall environments.

Product Description

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is Ardex S 1-K used for?

    Answer: Ardex S 1-K is designed specifically for waterproofing and crack isolation in interior flooring applications. This liquid membrane compound provides a robust, load-bearing surface that prevents moisture penetration and protects floors from structural cracks. It's ideal for use in residential or commercial spaces where water exposure is a concern, such as kitchens, bathrooms, and basements.
  • Question: How do you apply Ardex S 1-K?

    Answer: Application of Ardex S 1-K involves surface preparation, mixing, and spreading the compound using a trowel or roller. Ensure the substrate is clean and free of contaminants before applying a thin coat of the product. After spreading, allow it to cure as per the manufacturer's instructions. This product is straightforward to work with, making it suitable for both professional contractors and DIY enthusiasts.
  • Question: Is Ardex S 1-K suitable for outdoor use?

    Answer: Ardex S 1-K is primarily formulated for indoor applications. While it offers excellent waterproofing and crack isolation for interior floors, it is not recommended for outdoor use where direct exposure to weather conditions could compromise its performance. For external applications, consider other Ardex products specifically designed for outdoor environments.
  • Question: Can Ardex S 1-K be used over existing tiles?

    Answer: Yes, Ardex S 1-K can be applied over existing tile surfaces, provided that the tiles are securely adhered and cleaned adequately to ensure proper bonding. This makes it a practical choice for renovations where maintaining the existing floor level is crucial while providing an effective waterproofing layer.
  • Question: What makes Ardex S 1-K flexible?

    Answer: Ardex S 1-K is engineered with flexibility in mind, allowing it to accommodate slight movements in the substrate without cracking. This feature is essential for areas subjected to temperature fluctuations or minor shifts due to settling. Such properties make it ideal for various applications, including areas with radiant heating systems where expansion and contraction may occur.
  • Question: What is the drying time for Ardex S 1-K?

    Answer: The drying time for Ardex S 1-K typically ranges from a few hours to a day, depending on environmental conditions like humidity and temperature. It's crucial to allow adequate curing time before applying additional flooring materials, which ensures optimal performance and durability of the waterproofing layer.
  • Question: Is Ardex S 1-K eco-friendly?

    Answer: Ardex S 1-K is formulated with low volatile organic compounds (VOCs), making it a more environmentally friendly option for waterproofing compared to traditional products. This ensures better indoor air quality as it minimizes harmful emissions while still offering excellent waterproofing capabilities.
  • Question: What types of flooring can be installed over Ardex S 1-K?

    Answer: After curing, Ardex S 1-K provides a suitable substrate for various flooring types, including vinyl, tile, and carpet. This versatility allows homeowners and contractors to choose from a wide range of flooring options to meet aesthetic and functional requirements in interior spaces.
  • Question: How thick should the application of Ardex S 1-K be?

    Answer: The recommended thickness for applying Ardex S 1-K is typically between 1/16 inch to 1/8 inch, depending on the type of application. A thicker application may be required in areas prone to more severe moisture exposure. Adhering to these guidelines ensures optimal flexural strength and waterproofing effectiveness.
  • Question: Where can I buy Ardex S 1-K in Lesotho?

    Answer: You can purchase Ardex S 1-K from Ubuy in Lesotho. Ubuy offers a reliable platform for securing this high-quality waterproofing and crack isolation compound, ensuring you have access to the latest products for all your flooring needs.

Ardex Underlayments Editorial Review

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Customer Reviews & Ratings

59 customers ratings
  • 5 Star
    64%
  • 4 Star
    20%
  • 3 Star
    7%
  • 2 Star
    3%
  • 1 Star
    6%

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Jasmin
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“Great products and very good service: very easy and very fast international delivery.”

9 September 2026 · via Trustpilot
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Anke
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“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”

10 September 2026 · via Trustpilot
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Hazel
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“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”

10 September 2026 · via Trustpilot
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Opaleye
Verified buyer

“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

11 September 2026 · via Trustpilot
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Adele
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“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
  • Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

LSL 1770

Order now and get it around Wednesday, September 23

QTY:

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Fastest cross-border delivery

Features & Benefits

  • Easy-to-use, one-component waterproofing and crack isolation membrane.
  • Produces a flexible and positive-side waterproof coating.
  • Protects common interior building substrates from water exposure.
  • Provides excellent bonding layer for ARDEX tile and stone setting materials.
  • Can be used for crack isolation up to 1/8 (3 mm).
  • Recommended for bathrooms, showers, and other wet areas for tile installation.

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