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Mapei Keraflex Maxi S1 Zero Tile Adhesive 20kg High-Performance
Mapei Keraflex Maxi S1 Zero Tile Adhesive 20kg High-Performance

Mapei Keraflex Maxi S1 Zero Tile Adhesive 20kg High-Performance

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Description

Mapei Keraflex Maxi S1 Zero – Flexible Tile Adhesive (S1)

A high-performance, deformable cement-based tile adhesive designed for dependable fixing of large-format porcelain and natural stone on walls and floors. It’s built for strong adhesion, easier trowelling, and confident installations where movement resistance matters.

Best for

Large-format tiles, porcelain, busy domestic areas, and projects needing a flexible S1-rated adhesive.

Why it’s chosen

Strong bond, workable consistency for larger tiles, and improved performance on demanding substrates.

What to check

Substrate soundness, correct trowel size, coverage, open time, and movement joints for best results.

Key Features

  • Flexible S1 performance for improved resistance to movement and thermal variation.
  • Ideal for large-format tiles with a consistency designed to support bigger sizes.
  • High bond strength for reliable fixing on walls and floors.
  • Smooth trowelling for faster, cleaner application and better bed control.
  • Suitable for demanding areas when paired with correct preparation and movement joints.

Where It Works Best

  • Large-format porcelain wall & floor tiles
  • High-traffic domestic floors (hallways, kitchens)
  • Projects needing improved flexibility (S1)
  • Renovations (with the correct priming/prep system)

Not sure if it’s right?

If you’re fixing extremely low-porosity tiles, very large slabs, or installing over challenging substrates (e.g. existing tiles, certain waterproofing systems, or heated floors), the best result depends on preparation, primers, and correct trowel/bed thickness. If you share your tile size and substrate, you can match the correct adhesive + primer combo.

Quick check:

Tile size • Substrate • Indoor/Outdoor • Underfloor heating • Wall/Floor

Technical Details (Quick Reference)

Type Cement-based flexible tile adhesive
Performance class S1 deformable (flexible)
Recommended use Walls & floors, including large-format tiles
Colour Varies by pack (confirm option selected)
Mixing Add powder to clean water and mix to a smooth, lump-free paste
Coverage Coverage depends on trowel size, substrate flatness, and back-buttering (see estimator below)

Note: Always follow the product bag and technical datasheet for exact working times, open time, and cure times. Site conditions (temperature, humidity, substrate porosity) can significantly affect performance.

How to Use (Best-Practice Steps)

  1. 1) Prepare the substrate: Ensure it’s sound, clean, dry, and free from dust/grease. Flatten uneven areas and repair weak patches.
  2. 2) Prime when required: For dusty surfaces, porous backgrounds, or renovation work, use an appropriate primer system.
  3. 3) Mix correctly: Add powder to measured clean water and mix with a paddle mixer until smooth. Rest (slake) if required, then remix.
  4. 4) Apply with the right trowel: Spread adhesive, comb in one direction, and adjust trowel notch to tile size and substrate flatness.
  5. 5) Back-butter large formats: For larger tiles, apply a thin coat to the tile back to help achieve high contact coverage.
  6. 6) Maintain movement joints: Respect perimeter and intermediate movement joints to reduce stress cracking.

Pro install tip

Aim for high contact coverage (especially on floors and wet areas). Lift a tile occasionally to verify bed transfer and adjust trowel/back-buttering as needed.

Coverage Estimator (Practical Guide)

Coverage varies widely by notch size and bed thickness. Use this as a practical planning guide:

Typical trowel notch Typical use Approx. coverage*
6 mm Small/medium wall tiles, very flat surfaces Higher coverage
8–10 mm Most floor tiles, porcelain, general large formats Medium coverage
12 mm+ Very large formats / uneven substrates (after levelling where possible) Lower coverage

*Approximate guide only. For accurate coverage, base calculations on bag yield and on-site trial area.

Cleaning & Finishing Notes

  • Clean adhesive residue from tile faces before it cures, using clean water and a sponge.
  • Avoid over-wetting grout joints during final clean-down to protect joint strength and colour consistency.
  • Allow adhesive to cure before grouting—timing depends on conditions and tile type.

FAQs

Is Keraflex Maxi S1 Zero suitable for large-format porcelain tiles?

Yes—this adhesive is designed with large formats in mind. Use the correct notch size and back-butter larger tiles to achieve high contact coverage.

Can I use it on walls and floors?

It’s intended for both wall and floor fixing, provided the substrate is properly prepared and suitable for the tile load and installation environment.

Do I need a primer?

Sometimes. Primers are commonly recommended for dusty/porous backgrounds or renovation substrates. If you tell us your substrate (e.g., plaster, concrete, anhydrite, existing tiles), you can match the right primer.

What trowel size should I use?

It depends on tile size and substrate flatness. As a rule, larger tiles need larger notches. Always check coverage by lifting a tile to confirm good bed transfer.

Is it suitable for underfloor heating?

Flexible adhesives are commonly used with heated floors, but performance depends on the full system: substrate preparation, movement joints, and commissioning schedule. Follow UFH guidelines and product instructions.

Always confirm suitability with the latest technical datasheet and site conditions. For best results, match the adhesive, primer, and grout to your tile type and substrate.

Delivery & Returns

Delivery Information

Delivery Costs:

Delivery fees are calculated based on the weight of your order and your delivery location. You can use the delivery fee calculator in your basket or on the checkout page to find the exact cost.

Delivery Area:

We currently only deliver to UK Mainland and the Highlands. We do not deliver to the Islands, Ireland, or Northern Ireland.

Next Working Day Delivery (Subject to Stock Availability):

Orders placed before 12:00 pm (noon) will be delivered the next working day, excluding weekends and holidays. This service starts from £6.50 (including VAT) and the final cost is based on the weight of your order and your delivery location. You can check the exact cost in your shopping cart or on the checkout page by entering your postcode.

Cut-off Time for Genesis Products (Non-Stocked): 11:00 am

NO Next Day Service - Scotland:

We are unable to offer next-day service to the following postcode regions in Scotland.

Postcode: AB, IV, KW, PA .

Economy Service (2-3 Working Days):

This service is only available for orders over 50kg. There is no additional charge for this service.

Sample Orders:

All sample orders are shipped for free via Royal Mail Tracked 48 or 24 service. Delivery typically takes 1-3 working days.

Delivery Methods:

Non-sample orders under 50kg will be dispatched via DPD or APC Overnight. Non-sample orders over 50kg (quarter, half, and full pallets) will be dispatched via Palletways or Kandrmason (Kerbside delivery only).

Order Online & Collect In-Store!

Simply place your order online and choose the Click & Collect option at checkout.

We'll email you once your order is ready for pickup at your chosen store.

Collection hours: Monday - Friday: 8:30 am to 4:30 pm

For more information, please visit our Delivery Information page.

Returns Information
  • Please inspect your order upon receipt and contact us immediately (within 48 hours of receipt) if the item is defective, damaged, or if you receive the wrong item, so that we may evaluate the issue and make it right.
  • We will replace any items that are damaged during transit within 30 days of delivery.
  • We accept returns within 30 days of delivery.
  • Please note that customers are responsible for the cost of returning items where the return is due to a change of mind, including ordering the wrong item, ordering more than required, or any other non-fault reason
  • We will process returns and refunds promptly once the items are received at our warehouse.

Returning Trims

Schluter Trims:

  • Returning trims - 35% restocking fee applied.
  • Returning trim with replacement - 15% restocking fee applied.
  • Customers are responsible for arranging the return.
  • If we arrange a return collection, a £35 return item collection fee will be applied.

Mapei-Profilpas Trims:

  • A 20% restocking fee will be applied (item must be in re-sellable condition).
  • The customer is responsible for returning the item.

For more information, please visit our Return & Exchange page.

Delivery Costs:

Delivery fees are calculated based on the weight of your order and your delivery location. You can use the delivery fee calculator in your basket or on the checkout page to find the exact cost.


Delivery Area:

We currently only deliver to UK Mainland and the Highlands. We do not deliver to the Islands, Ireland, or Northern Ireland.


Next Working Day Delivery (Subject to Stock Availability):

Orders placed before 12:00 pm (noon) will be delivered the next working day, excluding weekends and holidays. This service starts from £6.50 (including VAT) and the final cost is based on the weight of your order and your delivery location. You can check the exact cost in your shopping cart or on the checkout page by entering your postcode.


Cut-off Time for Genesis Products (Non-Stocked): 11:00am


Economy Service (2-3 Working Days):

This service is only available for orders over 50kg. There is no additional charge for this service.


Sample Orders:

All sample orders are shipped for free via Royal Mail Tracked 48 or 24 service. Delivery typically takes 1-3 working days.


Delivery Methods:

Non-sample orders under 50kg will be dispatched via DPD or APC Overnight. Non-sample orders over 50kg (quarter, half, and full pallets) will be dispatched via Palletways or Kandrmason (curbside delivery only).


ORDER ONLINE & COLLECT IN-STORE!

Simply place your order online and choose the Click & Collect option at checkout.
We'll email you once your order is ready for pickup at your chosen store.
Collection hours: Monday - Friday: 8:30 am to 4:30 pm


For more information, please visit our Delivery Information page.

- Please inspect your order for any damages upon delivery and notify us immediately if you find any.

- We will replace any items that are damaged during transit.

- We accept returns within 30 days of delivery.

- Please note that customers are responsible for the cost of returning items.

- We will process returns and refunds promptly once the items are received at our warehouse.


Returning Trims
Schluter Trime
Returning trims - 35% restocking fees applied.
Returnign trim with replacement - 15% restocking fees applied
Customers are responsible to arrange returning the item.
If we arrange a return colleciton, a £35 return item collection feed will be applied.


Mapei-Profilpas Trims
A 20% restocking fee will be applied. (Item must be in re-sellable condition)
The customer is responsible for returning the item.


For more information, please visit our Return & Exchange page.

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