Ardex K55 FAST Ultra Rapid Drying Levelling and Smoothing Compound 20kg
Ardex K55 FAST Ultra Rapid Drying Levelling and Smoothing Compound 20kg
- ✓ Free Delivery — order over £450 inc vat
- ✓ Next Day Delivery —stocked items deliver next day (place order before 12pm)
- ✓ Trusted Trade Supplier — serving professionals nationwide
- ✓ Secure Protected Checkout — safe, encrypted payments every time
- ✓ Expert Support from Real Specialists — friendly help when you need it
Non-Stock 5-7 Working Days
Trade account pricing available
Exclusive contractor & developer rates.
No minimum order required.
TileExperience Trade Account
Save up to 15% on thousands of products with exclusive trade pricing and dedicated account support.
| Type | Screeds-Levellers |
|---|---|
| Brand | Ardex |
| Coverage | Approximately 4m2 at 3mm thick per 20kg bag |
ARDEX K 55 FAST Ultra Rapid Drying Levelling and Smoothing Compound
ARDEX K 55 FAST is the newest and fastest addition to ARDEX’s Levelling & Smoothing Compound range, engineered for superior levelling performance and ultra-rapid drying. This high-performance, cement-based compound allows application from a feather edge up to 10mm in a single coat, making it ideal for fast-track installations and time-sensitive projects.
Walkable in just 30 minutes and ready to receive floorcoverings in as little as 60 minutes (at 20°C), ARDEX K 55 FAST combines outstanding flow, finish, and strength with exceptional speed. Perfect for both renovation and new-build applications, this levelling compound delivers a smooth, even surface ready for resilient and timber floorcoverings.
Key Features
- Walkable in as little as 30 minutes.
- Ready to receive floorcoverings in just 60 minutes (at 20°C).
- Apply from a feather edge up to 10mm in one application.
- Exceptional flow and surface finish – no patching or rubbing down required.
- Rapid hardening and superior levelling performance with a 10-minute working time.
- Excellent coverage – over 6m² at 2mm thick per 20kg bag.
- Suitable for use over underfloor heating systems.
- Low embodied carbon: 0.96 kg CO₂ eq/kg (A1-A3 as defined in BS EN 15804).
Product Applications
ARDEX K 55 FAST is designed to level and smooth internal subfloors in a single application within a 10-minute working time. It is suitable for:
- Smoothing uneven, damaged or worn in-situ concrete subfloors.
- Adjusting tolerances or camber differences between floors, slabs or pre-cast concrete.
- Renovation of existing subfloors and screeds prior to installation of resilient floorcoverings such as vinyl, linoleum, or carpet.
- Use over heated screeds, provided they are commissioned as per BS 8204 Part 1 and BS EN 1264.
Note: ARDEX K 55 FAST is not intended to be used as a wearing surface.
Technical Data
| Property | Result |
|---|---|
| Working Time (20°C) | Approx. 10 minutes |
| Walkability (20°C) | Approx. 30 minutes |
| Ready to Receive Floorcoverings (20°C) | Approx. 60 minutes* |
| Application Thickness | Feather edge to 10mm |
| Coverage | Approx. 6.2m² at 2mm thickness per 20kg bag (1.62kg/m²/mm) |
| Weight of Fresh Mortar | Approx. 1.96kg/litre |
| Compressive Strength |
After 1 day: 20 N/mm² After 7 days: 30 N/mm² After 28 days: 35 N/mm² |
| Tensile Bending Strength |
After 1 day: 6 N/mm² After 7 days: 8 N/mm² After 28 days: 10 N/mm² |
| Suitable for Underfloor Heating | Yes |
| Embodied Carbon (A1–A3) | 0.96 kg CO₂ eq/kg |
| Packaging | 20kg paper sacks with polyethylene liner |
| Storage / Shelf Life | 6 months in unopened packaging, stored in cool, dry conditions |
*Dependent on substrate, application thickness, adhesive type, and ambient temperature.
Application Instructions
Pour the mixed ARDEX K 55 FAST onto the prepared subfloor and allow it to flow to a smooth finish within its 10-minute working time. Use a steel finishing float or long-handled smoothing trowel for best results. A spiked roller can also be used immediately after application to eliminate air bubbles.
Underfloor Heating Applications
Heated screeds must comply with BS 8204 Part 1 and BS EN 1264. The underfloor heating system should be fully commissioned and cooled to room temperature (not below 15°C) before applying ARDEX K 55 FAST. After installation, the system should be gradually brought up to operating temperature to prevent thermal shock.
Frequently Asked Questions (FAQ)
How quickly can I walk on ARDEX K 55 FAST after application?
ARDEX K 55 FAST can be walked on in as little as 30 minutes at 20°C, allowing for rapid progress on-site.
When can I install floorcoverings over ARDEX K 55 FAST?
Floorcoverings can typically be installed in as little as 60 minutes, depending on temperature, substrate, and layer thickness.
Is ARDEX K 55 FAST suitable for use with underfloor heating systems?
Yes, ARDEX K 55 FAST is suitable for use over underfloor heating systems when installed in accordance with BS 8204 Part 1 and BS EN 1264.
What is the coverage rate for ARDEX K 55 FAST?
A 20kg bag covers approximately 6.2m² at 2mm thickness or 4m² at 3mm thickness.
Can ARDEX K 55 FAST be used as a finished wearing surface?
No, ARDEX K 55 FAST is not designed as a wearing surface and should always be covered with a suitable floorcovering.
UK Mainland & Scottish Highlands only
We do not deliver to Islands, Ireland or Northern Ireland
How is shipping calculated?
Shipping is based on your order weight and delivery location. Add items to your cart and enter your postcode to see the exact cost before checkout.
Some products supplied directly from our manufacturers (non-stocked brands) carry a separate delivery charge — this is shown clearly at checkout.
Free delivery on orders £450+ inc VAT
Tiles & tiling materials only · Free samples always ship free
Next working day delivery
Order before 12:00 pm · From £6.50 + VAT · APC Overnight or DPD · Under 50 kg
Not available weekends or bank holidays
No next-day to Scotland postcodes
AB · IV · KW · PA — please allow additional working days for these regions
Pallet delivery — orders over 50 kg
Semi, half or full pallet · Palletways or K & R Mason · Next working day
Kerbside delivery only — driver cannot bring goods onto the property
Supplier direct delivery (non-stocked products)
Some brands are shipped directly from the manufacturer and carry a separate delivery charge, shown at checkout.
Genesis (trims) — £19 + VAT · 1–3 days · cut-off 11:00 am
Marmox (mosaics, shower trays) — £15 + VAT · 1–3 days
Marmox (oversized backing boards) — £65 + VAT · 1–3 days
Schluter (trims) — £20 + VAT · 1–3 days
Bihui (trims) — £15 + VAT · 1–3 days
Free sample delivery
No minimum spend · Up to 4 free samples · Next working day
Free Click & Collect
Select Click & Collect at checkout to pick up your order from our Croydon warehouse. We'll send an email confirmation once it's ready — please wait for this before visiting.
Bring your order confirmation email or order number when collecting.
If someone is collecting on your behalf, they must have the order number and the name on the order.
Mon – Fri, 8:30 am – 4:30 pm. Closed weekends & bank holidays.
Tile Experience, 108 Beddington Lane, Croydon, London, CR0 4YY
Order tracking
Email or SMS sent by the carrier once your order is dispatched
30-day return window
Returns accepted within 30 days of delivery. You also have a statutory 14-day cancellation right from the date of receipt.
Items must be unused & in original packaging
Returned goods must be uninstalled, unaltered and in the same condition as received.
Installed or cut items cannot be returned
Once tiles or materials have been cut, altered or installed, no return or refund is possible under any circumstances.
How to start a return
Contact us first at info@tileexperience.co.uk or call 0208 689 4187. Send the item back with your name and order number. Return shipping is the customer's responsibility.
Refund to original payment method
Processed within 3–5 working days of us receiving and approving your return.
Original delivery charges are not refunded. If no refund after 15 business days, contact us.
Damaged or incorrect items
Report within 48 hours of receipt. Email info@tileexperience.co.uk with your order number and photos of the damage. Confirmed replacements are sent next working day at no charge.
Non-stocked brands — restocking fee may apply
Returns for Genesis, Marmox and Bihui carry up to a 20% restocking fee. Schluter trims: 35% standard return, 15% if returning with a replacement order.
Cancellations
Cancel before dispatch for a full refund including delivery. Cancel after dispatch by rejecting the delivery — refund for goods only, not the delivery charge.