!FREE DELIVERY on Every Order (Most of Mainland UK) *
, , , ,

Larsen SLC 1550 Flex Self Levelling Compound – Pallet Deals and Bulk Buy – Universal Renovation Screed

(2 customer reviews)

Larsen SLC 1550 Flex Self Levelling Compound – Universal Renovation Screed

A single pack, fast-drying, universal renovation screed with fiberflex microfibre technology.

Larsen SLC 1550 Flex is manufactured from a controlled blend of special sands, cements and synthetic polymers to give a high quality flooring product which is self-levelling and smoothing. For use in fast track domestic and commercial situations, such as, where levelling of up to 50mm is required or for use over underfloor heating and on more difficult substrates, e.g. timber. It does not provide a wearing finish but provides an ideal surface to recieive resilient floor finishes including: carpet, natural stone, ceramic tiles, vinyl, resin coatings, etc. It is ideal for offices, dwellings, schools, hospitals, airports, etc.

  • Single pack
  • Self-levelling
  • 3-50mm in one application
  • Fast drying
  • Protein-free
  • FiberflexTM Technology
  • Foot traffic in 2-4 hours
  • BS EN 13813 CT–C25–F7
  • Unit size: 20Kg

Spotted a pallet deal cheaper than ours? We can usually beat it! 0333 344 2655 or info@buythepallet.co.uk

~ FREE DELIVERY on Larsen 2 - 4 days ~

£549.90 +VAT

£549.90 +VAT

Larsen SLC 1550 Flex Self Levelling Compound – Universal Renovation Screed extended information

Coverage: 20kg will cover approximately 3m2 @ 5mm


The building must be weather tight prior to the placing of any screed material: the roof, external doors and windows must be in place and closed or covered and taped to prevent draughts. All substrates must be suitable to receive the screed as per current good working practices. The substrate may be structurally sound concrete or screed; suitable timber; ceramic tiling; or existing resilient flooring. It must be thoroughly clean, dry and free from laitance, grease, oils, paint or other contaminants which may impair adhesion. Suitable mechanical preparation of substrate may be required. Air and substrate temperatures must be greater than 5°C. Relative Humidity of the floor must be <95% generally and <75% when moisture sensitive finishes are to be laid (if >75%, Larsen DPM should be applied to the substrate).

Existing movement joints should be carried through the Larsen SLC 1550 FLEX, preferably with proprietary joints. When applying over underfloor heating a suitable 10+mm PE foam expansion strip should be fitted the full depth of screed around the entire perimeter of the floor. In some instances it may be necessary to incorporate a glass fire reinforcing mesh in the screed, consult Technical Department for advice.


Normal concrete/screed requires priming with Larsen Acrylic primer diluted 1:1 with clean water. Particularly porous concrete/screed requires priming with Acrylic primer diluted 1:1 with clean water followed by a coat of Larsen Acrylic Primer applied neat. Relative Humidity of the floor must be <95% generally and <75% when moisture sensitive finishes are to be laid (if >75%, Larsen DPM should be applied to the substrate). Timber floors must be free from deflection and be suitably stable. Existing floorboards should be overlaid with minimum 15mm moisture resistant plywood, screw fixed at 300 mm centres. OSB may be used on floors, but must be flooring grade, rigid and screw fixed at 300mm centres. The surface should be sanded to remove any wax or similar treatment and then primed. WBP plywood may be used but due to the variability in quality, extra care should be taken. It is recommended that WBP sheets are sanded and primed. Edges of all timber sheets should be supported by joists or studs and where possible timber sheets should be tongue and groove. In wet areas timber should be suitably tanked. All timber substrates should be primed with one coat of Larsen Acrylic Primer applied neat. Allow primer to dry to a transparent tacky film before applying Larsen SLC 1550 FLEX.


Add 3.75 -4.25L of clean water per 20kg bag to achieve target flow of 215-230mm without bleed or settlement. Mix with a heavy duty drill and paddle for 1-2 minutes or with a suitable continuous mixer/pump. Excess water will cause a loss of strength.


Pour or pump the mixed product over the floor. Larsen SLC 1550 FLEX will level out to a smooth finish. Where necessary, release air bubbles with a trowel or spiked roller. This practice must be carried out within 5 – 10 minutes of application. SLC 1550 FLEX can be applied up to 50mm (minimum of 3mm). For thickness >30mm consult Technical Department for advice. The screed must be protected from draughts within the first 6 hours, if necessary open doorways and windows should be closed using tape and polythene

Subsequently, ensure the room has sufficient ventilation to allow the screed to dry out. After installation protect the screed from following trades. SLC 1550 FLEX will accept foot traffic after 2 – 4 hours. Floor coverings can be installed after 24 – 72 hours depending on thickness of Larsen SLC 1550 FLEX, substrate and site conditions. Should any trowel marks remain, remove with a wet trowel after 1-1½hrs.


Larsen Professional SLC 1550 FLEX is not suitable for industrial use and cannot be used as a final wearing surface. Larsen Professional SLC 1550 FLEX should not be applied to flexible surfaces or surfaces subject to vibration. All substrates must be suitable for the intended dutv and traffic without excessive deflection. All substrates must be sufficiently strong and stable to bear the weight of screed and covering. Prof SLC 1550 FLEX is suitable for use over underfloor heating systems. Room and substrate temperatures should be above 5°C during application.

Larsen SLC 1550 product information

HAZARD INFORMATION:IRRITANT contains cement - Consult Safety Datasheet before use
CLEANING:Clean tools, equipment etc. using warm water.
Mechanical means are necessary when the product has set.
PACKAGING:20kg multiwall, sealed paper sacks
STORAGE CONDITIONS:Store in sealed containers in dry conditions, protected from extremes of temperature
SHELF LIFE:6 months in unopened manufacturer's packaging

Larsen SLC 1550 application information

MIX PROPORTIONS:Mix 20 kg pack with approx. 4L water
POT LIFE:Approx. 30 minutes @ 20°C
(min 10mm when using reinforcing mesh)
TIME TO TRAFFIC:Light Foot Traffic - after 2 - 4 hours
Full Traffic - after 1 - 2 days
Covering - after 1 - 3 days
(depending on depth and site conditions)
COVERAGE:Approx 2.5 - 3m2 / 20kg pack @ 5mm

Larsen SLC 1550 performance information


Based on 2 reviews

5.0 overall

Add a review

  1. davetiler

    My go-to levelling compound and never had an issue, 5 stars!


  2. kennythefloorer

    Can’t go wrong with larsen slc 1550. Never fails me. Great product



Buy The Pallet - Tile Adhesive and Floor Levellers Discount Store

5.0Out of 5 stars

Overall rating out of 16 Google reviews

Phil Down
3 hours ago

They actually answered the phone, were polite, knowledgeable and the order was delivered in full and on time. Would fully recommend both on price and service. Thank you.

3 weeks ago

BTP very helpful in supplying a pallet of floor leveller. I needed it on the Saturday, but didn’t want it sitting on the driveway for several days. I called and they recommended ordering for Thursday to give a day’s grace in case of any delivery issues. In the event the pallet arrived on Thursday as requested. Reliable and good value

Gary Harper
2 months ago

Great service, great price and great communications. We will definitely use Buy The Pallet again

Adrian W
4 months ago

Great service and delivery! Ordered all that I needed in one go and it was delivered to the back door wrapped and protected from the snow! Pallet even made it so that the goods were dry off the ground.

Stephen Tucker
4 months ago

Great customer service and at an unbeatable price. All delivered on the day I needed it.

Boon Teo
4 months ago

Great prices with a good ranges of products . Customer Service is excellent!

Max Simpson
5 months ago

Very helpful!

Neil Salih
3 years ago

Peter Bostock
3 years ago

I purchased a pallet of these and I am very impressed from ordering to receiving my pallet and the delivery guys were very helpful as well .I will definitely recommend and use this company again .Highly recommend

Kev in
3 years ago

Amazing knowledge and great prices! Definitely using these guys on a regular basis for my pallet deals on levellers and adhesive

Rob Faulkner
3 years ago

Fantastic experience with Buy The Pallet. Everything I needed to complete a large flooring project, quick delivery & quality products.

Richard Fairlie
3 years ago

Great service and really good pricing! Super fast delivery and really lovely guy!

Marc. T
3 years ago

Very helpful