SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils


SC 1 is a premixed powder that when the exact amounts of water are added, gives rise to a specific mix for fast drying, shrinkage compensated sub-soils, suitable for both ceramic tiling and resin coating.

The ideal thickness for SC 1 screeds is 5÷6 cm, but a whole thickness range can be obtained.

SC 1 is CE marked according to the European Standard  EN13813 and it is classified as CT-C35-F7-A1fl

Usage field

SC 1 is used to obtain in a short time, when it is required, a subsoil ready to receive the subsequent installation of waterproofing coats like BETONGUAINA, floor resins or any type of tiles.

In fact, SC 1 allows the installation of BETONGUAINA, water-based epoxy resins, ceramic and cotto tiles after only 24 hours from casting, while allows the installation of rubber flooring, carpet and wood after only 10 days.

Heated floors

SC 1 is the perfect subsoil for any heated floors to be subsequently coated with any kind of finishing coat.

SC 1 is not chemically aggressive towards the most common type of pipes (made of polypropylene, etc.) used in the heating system.

In this case, after the screed is laid, it is advisable to start heating slowly and then switch to cooling, before proceeding with the coatings laying. 


30 kg bag in 56 bags pallets

SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils


Special attention must be paid during cast preparation both for what concerns handling the product while dry and the mixture; to this end, great care should be taken in following the warnings as well as the instructions given in the sections "How to use", "Warnings" and "Useful tips", in order to achieve the objectives established for the project

Installation of a Structural or Floating Screed

First it must be clear whether the to be made screed should adhere to the existing substrate (structural screed) or be separated from it (floating).

Substrate Preparation for Floating Screed

A waterproof sheet (minimum thickness of 200 micron) shall be applied to the installation area, with overlapped by at least 20 cm.

Position a 4÷5 mm thick foam strip along the perimeter and around pillars (if any).

Preparing the substrate to receive a Structural Screed

Check the substrate moisture content and, if it exceeds 2.5% (carbide measured), apply one or two layers of NORPHEN SW SOLID to the bottom until a continuous film has formed, then broadcast the surface, wet on wet, with a layer of quartz sand, grain size ranging from 0.7 to 1.2 mm.

If the substrate is dry, apply a foamed strip all around the perimeter (as above) and prepare a liquid mortar consisting of 1 part of undiluted GROVE PRIMER and 3 parts of SC 1.

Apply the grout on the installation surface with a scrubber.

Cast the SC 1 screed within a few minutes.

Tool cleaning

Clean tools with clean water until the product is fresh, once it has hardened remove it by mechanical means.

SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils

Average Consumption

To obtain 1 cm thickness of dry product approx. 18-20 kg of product each 1 m² are required.

SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils


This product is available only in grey











solid residue




granulometry, UNI EN 933-1



≤ 2.5

APPLICATION DATA (at +23 ° C and 50% RH)

Mix Bulk Density



2100 ± 50

mixing water




pot life




application temperature



from +5 to +35

minimum applicable thickness:

in adhesion to low thickness



minimum applicable thickness:




curing time for the installation:




curing time for the installation:

cotto and natural stone



curing time for the installation:

wood, vinyl, rubber, carpet



FINAL PERFORMANCE (in accordance with EN 13813)

Compressive strength

at 28 days



flexural strength

at 28 days


> 7

thermal conductivity, l (*)




reaction to fire




Note: the test method refers to regulations as indicated on the table

(*): the determination was carried out using a physical model compatible with the one of the reference standard UNI EN 12664:2002.

SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils

Warning and informations
  • Be sure to store the bags in the shade and away from humidity
  • Strictly abide to the exact mixing time and water amounts as instructed in the section “How to use”.
  • During the hardening phase, do not add any water to regenerate the product if it has started to set.

Useful Tips

  • The introduction, at one third from the bottom, of a reinforcing welded mesh (wire 5 mm, opening 20x20mm) will certainly improve the screed performance and help eliminate any crack due to shrinking.
  • In case of a cold shut a piece of welded mesh should be inserted between the cast ends, to avoid any joint formation.
  • Over piping or drainage you must reinforce with a hexagonal mesh (minimum screed thickness no less than 2 cm) to avoid crack formation. 



12 months in its original packaging, in a covered and dry place. At temperatures between +5 ° C and +35 ° C. The product is moisture sensitive.

SC 1

Ready-to-Use Screed for
Shrinkage-Compensated Sub-soils

Solutions number