@thewaterproofingshop1 · Kyle Bay
A roof screed at Kyle Bay with SCREED X.
SCREED X Rapid Engineered Screed 20 kg
Pre-blended engineered screed. Just add water. Walk on it in 2–3 hours, tile from 12, and lay membrane or vinyl at 24 hours once it is under 4% moisture. 30 MPa, 10–100 mm, inside or out.
30MPa28-day strength
<4%Moisture at 24 h
12hTile from
10–100mmThickness
$24.00
In stock, ready to dispatchPer 20 kg bag, inc. GST. 50 bags to a pallet. Not sure how many? Use the calculator.
200 kg · about 1.2 m² at 100 mm or 12 m² at 10 mm
Build the kit
Frequently bought together
Total
10-year FORSPEC product warrantyExpert advice: (02) 8021 3517Pallets delivered Australia wideMethod, TDS and SDS one tap away
Watch it · engineered screed explained
Mix it, lay it, compact it, float it, tile it tomorrow
Why site-mixed screeds fail, how SCREED X is different, and every step from the data sheet: prep, mixing ratio, compaction, joints, cure times and the watch-outs.
Bag calculator
How many bags do you need?
m²
mm
Allows 20 kg per m² for every 10 mm: one bag covers about 1 m² at 10 mm, or 4 bags per m² at 40 mm. That is the compacted rate for a 5 : 1 semi-dry screed, a little above the data sheet's 16–18 kg, so you won't run short.
Build your kit
Everything else for the job
Your bags from the calculator are already in. Tick the rest and add it all in one go.
The screed
Bond & prime
Reinforce & joints
Mix
Lay & finish
Safety
Why engineered screed
The screed is the floor under the floor
A site mix is only as good as the shovel count and the hose. An engineered screed is batched in a factory, so the strength, drying time and thickness rules are known before you start.
| Site mixSand + cement | SCREED XEngineered, pre-blended | |
|---|---|---|
| Mix | Guessed on site | Factory 5 : 1 |
| Water | Whatever works | 1.2–1.4 L per 20 kg |
| Strength | Untested | 30 MPa (C30), 5 MPa flexural (F5) |
| Foot traffic | Next day or later | 2–3 hours |
| Tile | Days to weeks | From 12 hours |
| Membrane / vinyl | Weeks, wait for it to dry | Under 4% at 24 hours |
| Thickness | Varies | 10–100 mm, rules on the TDS |
| Engineer / certifier | Hard to justify | Published TDS, AS 3958.1 |
| Every bag | Different | The same |
SCREED X times at 25 °C and 50% RH. Cold and damp sites take longer: always check with a carbide hygrometer.
Why point load matters
Floors fail where the weight sits on a small spot
A fridge foot, a stiletto heel, a pallet jack wheel or a loaded trolley puts its whole weight on a few square centimetres. On a weak or badly compacted bed, that spot crushes, the tile above loses support and cracks. Strength and compaction are what stop it.
Fridge feetAbout 100 kg on four small pads
Stiletto heelBody weight on a 1 cm² tip
Pallet jackA tonne on two small wheels
- Compact it hard. Air pockets left in the bed are where it crushes
- Keep to the thickness rules: 10 mm bonded, 40 mm unbonded, 45 mm floating
- Fully bonded over a 3 : 2 FORCEM / ACTFLEX 300 slurry, so the slab carries the load with it
Drying & next trade
Lay it today, the next trade is on it tomorrow
2–3 hWalk on itLight foot traffic
12 hTileTiling from 12 hours, per AS 3958.1
24 hUnder 4% moistureMembrane and vinyl once the hygrometer agrees
28 d30 MPaFull design strength
All at 25 °C and 50% RH. Measure moisture with a carbide hygrometer and follow the covering maker's limit.
NCC 2025 · externals are changing
The screed bed over the membrane is on the way out
For Class 2–9 buildings, NCC 2025 changes how roofs, balconies and podiums are built. NSW adopts it from 1 May 2027.
- Falls go in the structural slab, at least 1 : 80. A screed or tile bed doesn't count as the structural substrate (F1D4).
- The membrane goes straight on the concrete (F1D7).
- The finish is fixed to the membrane or self-draining, pedestals included (F1D10).
- Houses (Class 1) and bathrooms are not affected.
Anything else on an external needs a Performance Solution, backed by evidence. That's where an engineered screed with a published data sheet comes in. Talk to your consultant before you screed an external.
Need help with the build-up? Call our team on (02) 8021 3517.
On site
SCREED X on real jobs
Podiums, roofs and slabs: pumped or mixed on site, laid between rails, compacted and floated. Tap a video to play it.
@thewaterproofingshop1 · NCC 2025
Four numbers before the pour: the NCC 2025 balcony rules.
What goes on top
Ready for the next trade
SCREED X is under 4% moisture at 24 hours, so the waterproofer or floor layer can follow straight on.
ACTFLEX 906 WPU
ACTFLEX 929 HV
LEVEL X PRO
ACTFLEX 300Questions
Before you buy
How much water do I add?
Between 1.2 and 1.4 litres of clean water per 20 kg bag. Put the water in the mixer first, then add the whole bag. Never add more water, and never re-mix mortar that has started to stiffen.
How many bags do I need?
Allow about 20 kg per square metre for every 10 mm of thickness, so one bag covers about 1 m² at 10 mm or 0.25 m² at 40 mm. 20 m² at 40 mm is 80 bags, plus 5 to 10% for waste. Use the calculator on this page.
Is SCREED X self-levelling?
No. It is a semi-dry screed that you compact and float, from 10 to 100 mm. For a thin self-levelling finish over it, use LEVEL X or LEVEL X PRO.
When can I tile, waterproof or lay vinyl?
Foot traffic from 2 to 3 hours and tiling from 12 hours. Membranes and moisture-sensitive floors once residual moisture is under 4%, which SCREED X reaches at 24 hours at 25 °C and 50% RH. Check with a carbide hygrometer first.
What is the minimum thickness?
Bonded 10 mm (5 mm only with the ACTFLEX 300 and FIBRE X mix and written FORSPEC approval). Unbonded 40 mm to AS 3958.1, or 35 mm over FORSPEC membranes with mesh and a 200 micron slip sheet. Floating 45 mm. Maximum 100 mm.
Can I use a cement mixer?
Not a free-fall drum mixer. Use a forced-action pan mixer, a screed mixer or a high-torque paddle mixer such as the Makinex MS-20, and mix for 3 to 4 minutes.
What is the enhanced mix?
For better bond and water resistance, swap the water for a 2 : 1 blend of water and ACTFLEX 300: 800 mL of water and 400 mL of ACTFLEX 300 per bag. It is also what makes 5 mm bonded screeds possible, with FIBRE X and written FORSPEC approval.
Can it go over underfloor heating?
Yes. Screeds that include underfloor heating systems are one of the uses on the data sheet.
Is it tested?
The values on this page are typical Forspec R&D characteristic values to AS 1012.9 and AS 1012.11, with an indicative EN 13813 designation of CT-C30-F5. Test reports are available on request: call (02) 8021 3517.
About SCREED X
- What it is
- A pre-blended rapid structural screed: graded mineral aggregate and MINERALCORE binder at 5 : 1. Add 1.2–1.4 L of water per bag and mix.
- Why it is used
- Bonded, unbonded and floating screeds from 10 to 100 mm, ramps and build-ups, screeds over underfloor heating and over FORSPEC membranes. Internal and external. The next trade starts tomorrow, not next month.
- Built to last
- 30 MPa at 28 days (CT-C30-F5 indicative, EN 13813), installed to AS 3958.1. Strong enough for point loads that break a site-mixed bed.
Pick your build-up
- Bonded, 10 mm min. Over a 3 FORCEM : 2 ACTFLEX 300 slurry, wet-on-wet
- Unbonded, 40 mm min. On a 200 µm slip sheet. 35 mm over FORSPEC membranes
- Floating, 45 mm min. Over insulation or acoustic mat, mesh centred
- Up to 100 mm in one lift, including over underfloor heating
How to use SCREED X
Prep the slab
Sound, clean, no laitance, curing compounds or oil. Diamond grind or shot-blast smooth slabs and vacuum. Pull-off at least 1.5 MPa. Fix cracks first with PROBOND 1100, CRACK PRO 1200PS or CRACKLOCK E400L.
Pick the build-up
Bonded (10 mm min): brush in 3 FORCEM : 2 ACTFLEX 300 slurry, screed wet-on-wet. Unbonded (40 mm min, 35 mm over FORSPEC membranes): 200 µm slip sheet, laps 200 mm. Floating (45 mm min): over insulation with mesh centred.
Mix
1.2–1.4 L of clean water in the mixer first, then the full 20 kg bag (full bags only). Forced-action pan, screed or paddle mixer at 400–600 RPM for 3–4 minutes. It should hold its shape when squeezed and spread without slumping. No free-fall drum mixers.
Lay and compact
Spread between screed rails or levelling bars within 60 minutes. Compact solidly with a tamper, screed board or hand float, then strike off. Never add water or re-mix mortar that has stiffened.
Float and joint
Float with wooden or magnesium floats to close the surface. Compressible strip at walls, columns and fixed elements. Cut control joints to a third of the depth. Carry expansion joints through screed and finish.
Protect and cure
Keep off sun, wind and frost. Foot traffic from 2–3 hours, tiles from 12 hours. Membranes and moisture-sensitive floors once under 4% moisture on a carbide hygrometer.
From TDS Rev 2. Times at 25 °C, 50% RH.
Specs & technical data
- Classification
- CT-C30-F5 indicative (EN 13813)
- Compressive strength
- 17 / 25 / 30 MPa at 1 / 7 / 28 days (AS 1012.9)*
- Flexural strength
- 5 MPa at 28 days (AS 1012.11)*
- Thickness
- 10–100 mm
- Minimum, bonded
- 10 mm (5 mm with ACTFLEX 300 + FIBRE X and written FORSPEC approval)
- Minimum, unbonded
- 40 mm per AS 3958.1; 35 mm over FORSPEC membranes
- Minimum, floating
- 45 mm
- Water
- 1.2–1.4 L per 20 kg bag
- Mixing time
- 3–4 minutes
- Working time
- About 60 minutes
- Foot traffic
- 2–3 hours
- Tiling
- From 12 hours
- Residual moisture
- Under 4% at 24 hours
- Application temperature
- 5–30 °C, air and substrate
- Substrate pull-off
- 1.5 MPa minimum
- Consumption
- 16–18 kg per m² per 10 mm
- Yield
- 11.5–12 L compacted per bag
- VOC
- Under 0.5 mg/m³*
- Pack
- 20 kg lined bag, 50 per pallet (1,000 kg)
- Shelf life
- 12 months unopened, stored dry
- SKU
- SSCF660
*Typical Forspec R&D characteristic values. All times at 25 °C, 50% RH.
Downloads
TDSSCREED X Technical Data SheetStrength, ratios, thickness, method
SDSSCREED X Safety Data SheetRev 2, 30 Jul 2025
TDSFORCEM Screed BinderBond slurry binder
TDSACTFLEX 300Primer and slurry polymer
TDSFIBRE XFibreglass additive
TDSACTFLEX SuperPrime 008Primer for non-porous surfaces
LABTest reportsAvailable on request: (02) 8021 3517
Performance values are typical Forspec R&D characteristic values. Test reports on request: (02) 8021 3517.