Larsen Professional SLC 1550 FLEX Self Levelling Flooring Screed

Professional SLC 1550 FLEX is a single pack, fast-drying, universal renovation screed with fiberflex microfibre technology. It 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 receive resilient floor finishes including: carpet, natural stone, ceramic tiles, vinyl, resin coatings, etc.  It is ideal for offices, dwellings, schools, hospitals, airports, etc.

Larsen Professional SLC 1550 FLEX Features & Benefits:

• Single pack
• Self-levelling
• 3-50 mm in one application
• Fast drying
• Protein-free
• FiberflexTM Technology
• Foot traffic in 2-4 hours
• BS EN 13813 CT–C25–F7
• 20 KG multi-wall bags
• Coverage: 20 kg will cover approximately 3 m2 @ 5 mm
• Store unopened, off the ground, in damp and draft free conditions – protect from temperature extremes

Larsen Professional SLC 1550 FLEX Application Information:

• Mix Proportions: Mix a 20KG Pack with approx. 4 litres of water
• Pot Life: Approx. 30 mins at 20 degrees C
• Application Temperatures: 5-30 degrees C
• Bed thickness: 3-50mm (min 10mm when using reinforcing mesh)
• Traffic:
  • Light Foot Traffic after 2-4 hours
  • Full traffic after 1- 2 days
  • Covering after 1-3 days
• Coverage: Approx. 2.5-3m2 per 20KG Pack @ 5mm
• Performance:
  • Shrinkage: <0.06%
  • Compressive Strength: >_25MPa
  • Flexural Strength: >_ 7MPa
  • Classification: EN13813 – CT-C25-F7

How do I prepare to apply Larsen SLC 1550 FLEX?

The building should be weather-tight prior to the application of any screed materials. The roof, external doors and windows must be in place, closed or covered, and they must be taped to prevent any draughts. The substrate must be structurally sound concrete or screed and must be thoroughly clean, dry, and free from dirt, debris or dust which may impair adhesion. Suitable mechanical preparation of substrate may be required. Air and substrate temperatures must be greater than 5oC. Relative Humidity value of the floor must be less than 75% when moisture sensitive finishes are to be laid onto the SLC 1550.

Do I need to prime or use a DPM ahead of applying SLC 1550 FLEX?

Normal concrete and screed requires priming with an acrylic primer, diluted 1:1 with clean water. For particularly porous concrete and screed, we recommend priming with an acrylic primer diluted 1:1 with clean water followed by another coat of acrylic primer applied neat. Please note that if the relative humidity value of the floor is greater than 75%, Larsen DPM should be used. Apply two coats of DPM as directed with the dry sand (0.7 -1.2mm) scatter into the wet second coat at a rate of 2 kg/m2 (with the excess removed by vacuuming). For thickness of >25mm or heavy traffic areas, ring us for advice.

How do I mix Larsen SLC 1550 FLEX?

1. Simply add 3.75 to 4.25 litres of clean water to a bucket
2. Add a 20kg bag of SLC 1550 FLEX
3. Mix with a heavy duty drill and paddle for 1-2 minutes or with a suitable continuous mixer-pump.

Important: Do not add more than 4.25 litres of water for each 20KG bag, as excess water will cause a loss of strength in the product.

How do I apply Larsen SLC 1550 FLEX?

Once the required consistency of SLC 1550 is achieved, pour or pump apply the mixed product over the sub-floor. SLC 1550 will self-level into smooth finish. Where necessary, release any air bubbles in the product with a trowel or spiked roller, this must be carried out within 5 – 10 minutes of application. SLC 1550 can be applied up to 50mm (min 3mm when pumping).

Once applied the screed must be protected from draughts for the the first 6 hours to allow the SLC 1550 to cure, we always advise taping up doorways and windows with polythene. After the 6 hour period, then ensure the room has sufficient ventilation to allow the screed to fully dry out. SLC 1500 can receive foot traffic after 2 – 4 hours, and floor coverings can be installed after 24 – 72 hours depending on thickness of SLC 1550, substrate and site conditions. If any trowel marks remain, remove with a wet trowel after 1-1½hrs.

For more information a copy of the datasheet or to speak to a member of our team, call ☎️ 0330 122 1025