FORCEM SCREED BINDER Screed binder
High-performance hydraulic screed binder
Screed binder for 10 to 100 mm screeds. 90 to 120 minutes working time, light foot traffic in about 8 hours.
How FORCEM SCREED BINDER goes on
FORCEM SCREED BINDER coverage, coats and cure times
Hydraulic binder you mix with graded sand and water to make bonded, unbonded and floating screeds, internal or external, including over underfloor heating. Place by hand or pump.
- Thickness
- 10–100 mmbonded, unbonded and floating systems · TDS p2
- Mix ratio
- 1 : 5by weight, 20 kg FORCEM to 100 kg graded sand · TDS p2
- Coverage
- ≈ 6.1 m²per 20 kg bag at 10 mm, standard 1 : 5 mix · TDS p4
- Working time
- 90–120 mintypicalapproximately, to place, compact and finish · TDS p2
- Light traffic
- ≈ 8 htypicalapproximately, after placing · TDS p2
- Membrane from
- 24 htypicalwaterproofing membrane application · TDS p2
- Compressive
- 30 MPatypicalat 28 days; 17 MPa at 1 day, 25 MPa at 7 days · TDS p2
- Apply at
- 5–35°Ctypicalambient and substrate · TDS p2
- Pack
- 20 kg bagmulti-ply paper bag with inner lining · TDS p2
From the FORSPEC data sheet, TDS-FORCEM · Revision 3 · 12 November 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.
Where FORCEM SCREED BINDER is used
Use it for
- Bonded screeds over prepared concrete, 10 mm minimum
- Unbonded screeds over slip membranes, 40 mm minimum
- Floating screeds over insulation and underfloor heating, 55 mm minimum
- Screeds to falls under membranes in wet areas, balconies and podiums
- Screeds under tile, vinyl, timber, natural stone and carpet
- Renovation, repair and programmes needing rapid drying
Know before you start
- No portland cement, lime, gypsum or other binders in the mix
- Never use fine sand alone: graded 0–8 mm aggregate only
- Do not wet-cure unless approved for FORCEM, and no curing compounds
- Not below 5°C or above 35°C, and never on frozen substrates
Its FORSPEC systems
How to apply FORCEM SCREED BINDER
- 01
Prepare
Bonded: grind or shot-blast, vacuum, then brush on a slurry of 3 parts FORCEM to 2 parts ACTFLEX 300. Unbonded over a membrane: a double slip sheet, 200 mm laps.
- 02
Mix
1 part FORCEM to 5 parts graded 0–8 mm sand by weight. Add water slowly to a moist-earth consistency (squeeze-ball test). Mix at least 5 minutes.
- 03
Place
Place within the working time. Compact with a screed bar or tamper, then strike off to falls and levels. Float to a closed finish without adding water.
- 04
Joints
Carry movement, structural and expansion joints through the full screed and finish. Control joints at maximum 4 m x 4 m.
- 05
Protect
Protect from rain, wind, direct sun, frost and rapid moisture loss. Do not wet-cure. Light foot traffic from about 8 hours.
- 06
Cover
Membranes from 24 hours. Tiling from 24 hours with moisture verified. Resilient, timber or moisture-sensitive coverings only after a carbide hygrometer confirms the limit.
A short guide from the data sheet. Read the full FORCEM SCREED BINDER TDS before you start.
How much FORCEM and sand do I need?
Screed binder you mix with sand, 20 kg bag
One standard batch (20 kg FORCEM + 100 kg sand) makes about 61 L compacted, or 6.1 m² at 10 mm. The 1 : 4 batch makes about 51 L. Water is the dry-sand figure per batch; the enhanced mix swaps 2 L of it for ACTFLEX 300. Theoretical yield, before falls, compaction and site losses.
You need
0 bags
Where the figures come from
One standard batch (20 kg FORCEM + 100 kg sand) makes about 61 L compacted, or 6.1 m² at 10 mm. The 1 : 4 batch makes about 51 L. Water is the dry-sand figure per batch; the enhanced mix swaps 2 L of it for ACTFLEX 300. Theoretical yield, before falls, compaction and site losses.
- Yield per 20 kg bag, standard 1:5: about 61 L; 6.1 m² at 10 mm. TDS-FORCEM, R3, 12 Nov 2026, page 3
- Yield per 20 kg bag, reduced 1:4: about 51 L; 5.1 m² at 10 mm. TDS-FORCEM, R3, 12 Nov 2026, page 3
- Sand and water per batch (dry sand): 100 kg, 8.5 to 9.0 L; 1:4 batch 80 kg, 7.0 to 7.2 L. TDS-FORCEM, R3, 12 Nov 2026, page 2
- Enhanced mix: 2 L of ACTFLEX 300 per 20 kg FORCEM and 100 kg sand, deducted from the water. TDS-FORCEM, R3, 12 Nov 2026, page 3
- Minimum thickness: bonded 10 mm; unbonded 40 mm; floating 55 mm. TDS-FORCEM, R3, 12 Nov 2026, page 4
More: FORCEM SCREED BINDER product page · Screeds & levelling system
Drawings for the systems it goes in
FORSPEC standard details as PDF and DXF. Each sheet is a generic detail: the specification names the products.
FORCEM SCREED BINDER test reports and compliance
- EN 13813 designation
- Indicative CT-C30-F4Forspec R&D data, no test report cited
- Compressive, 28 days
- Class C30, 30 MPaAS 1012.9 basis, Forspec R&D
- Flexural, 28 days
- Class F4, 4.5 MPaAS 1012.11 basis, Forspec R&D
- AS 3958.1
- Installation, thickness and jointing complyStatement in the TDS
- VOC emission
- Negligible, no certificateNo Green Star VOC claim is made
Results as stated in the data sheet, TDS-FORCEM · Revision 3 · 12 November 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
FORCEM SCREED BINDER questions
How much FORCEM SCREED BINDER do I need?
One 20 kg bag with 100 kg sand makes about 61 L of screed. That covers about 6.1 m² at 10 mm, 3.0 m² at 20 mm, 1.5 m² at 40 mm and 1.1 m² at 55 mm. Theoretical, before wastage.
What is the mix ratio?
Standard is 1 : 5 by weight, 20 kg FORCEM to 100 kg graded 0–8 mm sand. A richer 1 : 4 batch (20 kg to 80 kg sand) suits mixers that cannot carry the full batch.
How thin can I screed?
Bonded 10 mm, unbonded 40 mm, floating 55 mm. Bonded 5 mm and unbonded 35 mm need the ACTFLEX 300 and FIBRE X enhanced mix, and bonded 5 mm needs written FORSPEC approval.
How long before I can walk on it or waterproof?
Light foot traffic in about 8 hours and waterproofing membranes from 24 hours. Tiling from 24 hours once moisture is verified. Working time is about 90 to 120 minutes.
What does ACTFLEX 300 do in the mix?
It improves adhesion, cohesion and resistance to water absorption. Use 2 L per 20 kg FORCEM and 100 kg aggregate, and deduct it from the water so the mix stays moist-earth.
What can I not mix with FORCEM?
No portland cement, lime, gypsum or other binders, and never fine sand alone. Do not add water after set begins or re-temper stiffened material.
Used with FORCEM SCREED BINDER
FORCEM SCREED BINDER TDS and SDS
Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for FORCEM SCREED BINDER.