Waterproofing membrane calculator
Pick the job, enter the size, get the kits, pails, bags or rolls. A waterproofing membrane calculator with every figure from the FORSPEC data sheet.
How much ACTFLEX 989 CWP do I need?
Cementitious membrane, 18 kg kit
One 18 kg kit covers about 8 m² at 1.2 mm in 2 coats, or about 6.4 m² at 1.5 mm in 3 coats. Coverage excludes waste, texture and detailing, so the 10% is on by default.
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One 18 kg kit covers about 8 m² at 1.2 mm in 2 coats, or about 6.4 m² at 1.5 mm in 3 coats. Coverage excludes waste, texture and detailing, so the 10% is on by default.
- 18 kg kit at 1.2 mm, 2 coats: about 8 m². TDS-989CWP, R3, 11 Nov 2026, page 4
- 18 kg kit at 1.5 mm, 3 coats: about 6.4 m². TDS-989CWP, R3, 11 Nov 2026, page 4
- Coats and film: 2 coats to 1.2 mm; 3 coats to 1.5 mm. TDS-989CWP, R3, 11 Nov 2026, page 6
More: ACTFLEX 989 CWP product page · Internal wet areas system · Pools & tanks system
How much ACTFLEX 988 CWP do I need?
Cementitious membrane, 20 kg kit
One 20 kg kit covers about 8 to 10 m² at 1.2 mm in 2 coats, or 6.4 to 8 m² at 1.5 mm in 3 coats. The calculator uses the low end, so you do not run short.
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One 20 kg kit covers about 8 to 10 m² at 1.2 mm in 2 coats, or 6.4 to 8 m² at 1.5 mm in 3 coats. The calculator uses the low end, so you do not run short.
- 20 kg kit at 1.2 mm, 2 coats: about 8 to 10 m² (8 used). TDS-988CWP, R2, 12 Aug 2026, page 4
- 20 kg kit at 1.5 mm, 3 coats: about 6.4 to 8 m² (6.4 used). TDS-988CWP, R2, 12 Aug 2026, page 4
More: ACTFLEX 988 CWP product page · Below ground system · Negative side system · Pools & tanks system
How much ACTFLEX 906 WPU do I need?
Polyurethane membrane, 20 kg pail
Uses 2.5 kg per m² for the 1.2 mm minimum, the top of the TDS range of 2.0 to 2.5 kg. A thicker film is scaled up in proportion. The 1.2 mm dry film is what passes, not the maths: check each coat with a wet film gauge.
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Uses 2.5 kg per m² for the 1.2 mm minimum, the top of the TDS range of 2.0 to 2.5 kg. A thicker film is scaled up in proportion. The 1.2 mm dry film is what passes, not the maths: check each coat with a wet film gauge.
- Consumption at 1.2 mm total dry film: 2.0 to 2.5 kg/m² (2.5 used). TDS-906WPU, R3, 13 Nov 2026
- 20 kg pail at 1.2 mm: about 8 to 10 m². TDS-906WPU, R3, 13 Nov 2026
More: ACTFLEX 906 WPU product page · Internal wet areas system
How much ACTFLEX 929 HV do I need?
Polyurethane membrane for walls and details, 15 L pail
Two coats at about 0.7 mm wet (1.4 L/m²) for the 1.2 mm dry film; planter boxes two coats at about 0.85 mm wet (1.7 L/m²) for 1.5 mm. EP 250: one coat at 0.32 kg/m², so a 4 kg kit primes about 12.5 m². 700 PU: 4 to 6 m² per litre, so 17 L primes about 68 m². 75FC: a 12 mm fillet takes about 80 mL a metre, so a 600 mL sausage runs about 7 m.
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Two coats at about 0.7 mm wet (1.4 L/m²) for the 1.2 mm dry film; planter boxes two coats at about 0.85 mm wet (1.7 L/m²) for 1.5 mm. EP 250: one coat at 0.32 kg/m², so a 4 kg kit primes about 12.5 m². 700 PU: 4 to 6 m² per litre, so 17 L primes about 68 m². 75FC: a 12 mm fillet takes about 80 mL a metre, so a 600 mL sausage runs about 7 m.
- Consumption, 1.2 mm dry film in two coats: about 1.4 L/m². TDS-929HV, R4, 27 Oct 2026, page 3
- Consumption, planter boxes, 1.5 mm: about 1.7 L/m². TDS-929HV, R4, 27 Oct 2026, page 3
- EP 250 per coat; 4 kg kit, one coat: 0.32 kg/m²; 12.5 m². TDS-EP250, R4, 12 Nov 2026, page 3
- 700 PU coverage; pack: 4 to 6 m²/L; 17 L. TDS-700PU, R2, 12 Aug 2026, page 2
- 75FC demand: width × depth in mm = mL per metre, plus about 10%. TDS-75FC, R2, 12 Aug 2026, page 3
More: ACTFLEX 929 HV product page · Balconies & podiums system · Planter boxes system
How much ACTFLEX 929 SL do I need?
Self-levelling polyurethane membrane, 15 L pail
Two coats at 0.7 mm wet = 1.4 L/m² for 1.2 mm dry (planter boxes 2 × 0.85 mm = 1.7 L/m², 1.5 mm dry). A 15 L pail covers 10.7 m² in theory and 8 to 10 m² in practice: the 20% allowance lands at about 8.9 m². Primer: 700 PU one coat (17 L, about 68 m²); damp, EP 250 two coats (4 kg kit, about 6.25 m²); metal or PVC, SUPERBOND 007 (1 L, about 8 m², or 250 ml, about 2 m²). 75FC 15 × 15 mm fillet around the edge: about 5.3 m per 600 mL.
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Where the figures come from
Two coats at 0.7 mm wet = 1.4 L/m² for 1.2 mm dry (planter boxes 2 × 0.85 mm = 1.7 L/m², 1.5 mm dry). A 15 L pail covers 10.7 m² in theory and 8 to 10 m² in practice: the 20% allowance lands at about 8.9 m². Primer: 700 PU one coat (17 L, about 68 m²); damp, EP 250 two coats (4 kg kit, about 6.25 m²); metal or PVC, SUPERBOND 007 (1 L, about 8 m², or 250 ml, about 2 m²). 75FC 15 × 15 mm fillet around the edge: about 5.3 m per 600 mL.
- Total consumption, two coats: 1.4 L/m² (planter boxes 1.7 L/m²). TDS-929SL, R4, 27 Oct 2026, page 6
- 15 L pail: theoretical; practical: 10.7 m²; 8 to 10 m². TDS-929SL, R4, 27 Oct 2026, page 6
- EP 250 two coats: 0.64 kg/m² (4 kg kit about 6.3 m²). TDS-EP250, R4, 12 Nov 2026, page 3
- 700 PU coverage: 4 to 6 m²/L per coat. TDS-700PU, R2, 12 Aug 2026, page 2
- SUPERBOND 007 on dense substrates; pack: 8 to 12 m²/L (8 used); 1000 mL. TDS-SUPERBOND007, R1, 25 Aug 2026, page 2
- 75FC demand: width × depth in mm = mL per metre. TDS-75FC, R2, 12 Aug 2026, page 3
- SUPERBOND 007 packs shown: 1 L and 250 ml. FORSPEC system figure
More: ACTFLEX 929 SL product page · Balconies & podiums system
How much ACTFLEX 101 UV do I need?
UV-stable roof membrane, 15 L pail
Roofs, gutters and exposed horizontals: 1.2 mm dry in two coats, about 1.84 L/m². Exposed walls: 0.8 mm in two coats, about 1.23 L/m². With 10% that lands on the TDS practical yield: 7 to 9 m² a pail on roofs, 11 to 13 m² on walls. Primer: EP 250 at 0.32 kg/m² a coat (4 kg kit, about 12.5 m² one coat), two coats on damp or new concrete. SuperPrime 008 on metal and PVC, about 8 m² per litre.
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Roofs, gutters and exposed horizontals: 1.2 mm dry in two coats, about 1.84 L/m². Exposed walls: 0.8 mm in two coats, about 1.23 L/m². With 10% that lands on the TDS practical yield: 7 to 9 m² a pail on roofs, 11 to 13 m² on walls. Primer: EP 250 at 0.32 kg/m² a coat (4 kg kit, about 12.5 m² one coat), two coats on damp or new concrete. SuperPrime 008 on metal and PVC, about 8 m² per litre.
- Per coat at 0.6 mm dry; two-coat 1.2 mm system: 0.92 L/m²; about 1.84 L/m². TDS-101UV, R2, 12 Aug 2026, page 5
- Two-coat 0.8 mm wall system: 0.62 L/m² per coat, 1.23 L/m² total. TDS-101UV, R2, 12 Aug 2026, page 3
- Practical yield per 15 L pail: 7 to 9 m² roofs; 11 to 13 m² walls. TDS-101UV, R2, 12 Aug 2026, page 3
- EP 250 4 kg kit: 12.5 m² one coat; about 6.3 m² two coats. TDS-EP250, R4, 12 Nov 2026, page 3
- SuperPrime 008 on non-porous; pack: 8 to 12 m²/L (8 used); 1000 mL. TDS-SUPERPRIME008, R1, 25 Aug 2026, page 2
How much ACTFLEX 400 CLEAR do I need?
Clear membrane over tiles, 1, 3 and 7 kg
Over tiles, diluted 2 : 1, three thin coats: 1 kg covers about 3 m², 3 kg about 9 m², 7 kg about 21 m². Grout lines, mortar and concrete build to 0.5 mm and use about 0.9 to 1.1 kg per m². Best mix is the least product that covers the job in the fewest pails.
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Over tiles, diluted 2 : 1, three thin coats: 1 kg covers about 3 m², 3 kg about 9 m², 7 kg about 21 m². Grout lines, mortar and concrete build to 0.5 mm and use about 0.9 to 1.1 kg per m². Best mix is the least product that covers the job in the fewest pails.
- Practical yield over tiles, 3 thin coats: 1 kg about 3 m²; 3 kg about 9 m²; 7 kg about 21 m². TDS-400CLEAR, R2, 12 Aug 2026, page 2
- Joins, grout, mortar, level surfaces, 0.5 mm: about 0.9 to 1.1 kg/m² (1.0 used). TDS-400CLEAR, R2, 12 Aug 2026, page 2
How many rolls of ACTFLEX 5000 do I need?
Self-adhesive sheet membrane, 20 m² roll
Roll 1 m × 20 m = 20 m² gross. Take-off: measured area plus upturns, plus 20% for the 75 mm laps (about 10%) and waste (about 10%). Each drop runs top to bottom and 200 mm onto the footing. A 300 mm detail strip runs along the wall base. Primer: ACTFLEX 300 (15 L, 45 to 75 m², 45 used); damp or poor substrate, EP 250 two coats at 0.32 kg/m² each (4 kg kit, about 6.25 m²).
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Roll 1 m × 20 m = 20 m² gross. Take-off: measured area plus upturns, plus 20% for the 75 mm laps (about 10%) and waste (about 10%). Each drop runs top to bottom and 200 mm onto the footing. A 300 mm detail strip runs along the wall base. Primer: ACTFLEX 300 (15 L, 45 to 75 m², 45 used); damp or poor substrate, EP 250 two coats at 0.32 kg/m² each (4 kg kit, about 6.25 m²).
- Take-off basis: measured area plus upturns, plus 20% for laps and waste. TDS-ACTFLEX5000, R2, 9 Nov 2026, page 3
- Lap; detail strip: 75 mm on every side and end lap; 300 mm strip at internal corners and penetrations. TDS-ACTFLEX5000, R2, 9 Nov 2026, page 3
- Roll size: 1 m × 20 m, 20 m² gross. FORSPEC system figure
- Drop carried onto the footing: 200 mm. FORSPEC system figure
- ACTFLEX 300 tack coat: 15 kg pail primes about 45 to 75 m² per coat (45 used). TDS-ACTFLEX300, R2, 12 Aug 2026, page 3
- EP 250 two coats: 0.64 kg/m². TDS-EP250, R4, 12 Nov 2026, page 3
More: ACTFLEX 5000 product page · Below ground system · Balconies & podiums system
How many rolls of PREFLEX 3000 do I need?
Pre-applied sheet under slabs and blindside walls, 20 m² roll
Roll 1 m × 20 m = 20 m² gross. Net cover depends on the side and end laps in your approved detail, plus cutting at grade beams, pile caps and pipes, so 20% is added by default. The floor turns 400 mm up every wall (TDS: 300 to 400 mm). Tapes are an allowance, not a TDS rate: NS Tape for end laps, S Tape for exposed terminations, base corners and repairs.
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Where the figures come from
Roll 1 m × 20 m = 20 m² gross. Net cover depends on the side and end laps in your approved detail, plus cutting at grade beams, pile caps and pipes, so 20% is added by default. The floor turns 400 mm up every wall (TDS: 300 to 400 mm). Tapes are an allowance, not a TDS rate: NS Tape for end laps, S Tape for exposed terminations, base corners and repairs.
- Roll size, standard: 1 m × 20 m, 20 m² gross. TDS-PREFLEX-3000, R3, 22 Aug 2026, page 6
- Net coverage per roll: gross area less the project's side and end laps (no fixed figure). TDS-PREFLEX-3000, R3, 22 Aug 2026, page 6
- Floor upturn at walls: 300 to 400 mm (400 used). TDS-PREFLEX-3000, R3, 22 Aug 2026, page 6
How many bags of SCREED X do I need?
Pre-blended screed, 20 kg bag
Allows 18 kg per m² for every 10 mm, the top of the TDS range of 16 to 18 kg, so you do not run short. One 20 kg bag covers about 1.1 m² at 10 mm. Minimums: bonded 10 mm, unbonded 35 mm over a FORSPEC membrane on a double slip sheet, floating 45 mm.
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Allows 18 kg per m² for every 10 mm, the top of the TDS range of 16 to 18 kg, so you do not run short. One 20 kg bag covers about 1.1 m² at 10 mm. Minimums: bonded 10 mm, unbonded 35 mm over a FORSPEC membrane on a double slip sheet, floating 45 mm.
- Consumption: about 16 to 18 kg per m² per 10 mm (18 used). TDS-SCREEDX, R3, 12 Nov 2026, page 2
- Yield per 20 kg bag: about 11.5 to 12.0 L compacted; 1.15 to 1.20 m² at 10 mm. TDS-SCREEDX, R3, 12 Nov 2026, page 2
- Minimum thickness: bonded 10 mm; unbonded 40 mm, engineered 35 mm over FORSPEC membranes; floating 45 mm. TDS-SCREEDX, R3, 12 Nov 2026, page 3
- Unbonded over a membrane: 35 mm is the FORSPEC system figure, on a double slip sheet. FORSPEC system figure
- Pack: 20 kg bag; 50-bag pallet. TDS-SCREEDX, R3, 12 Nov 2026, page 2
More: SCREED X product page · Balconies & podiums system · Screeds & levelling system
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.
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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
How many bags of LEVEL X do I need?
Self-levelling compound, 20 kg bag
About 1.7 kg of powder per m² per mm (11.7 L of mix per bag). Over 30 mm the bulk-fill mix applies: up to 20 kg of 2 to 5 mm gravel per bag adds about 7.5 L, then a neat finish layer (3 mm). Measure the depth at several points: the average sets the bags.
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About 1.7 kg of powder per m² per mm (11.7 L of mix per bag). Over 30 mm the bulk-fill mix applies: up to 20 kg of 2 to 5 mm gravel per bag adds about 7.5 L, then a neat finish layer (3 mm). Measure the depth at several points: the average sets the bags.
- Powder consumption: about 1.7 kg per m² per mm. TDS-LEVELX, R2, 12 Aug 2026, page 2
- Yield per 20 kg bag; bulk fill: about 11.7 L; + 20 kg of 2 to 5 mm gravel adds about 7.5 L. TDS-LEVELX, R2, 12 Aug 2026, page 2
- Application thickness: 1.5 to 100 mm per pass. TDS-LEVELX, R2, 12 Aug 2026, page 2
- Damp or green slab primer: two coats of EP 250 at about 3 m² per litre per coat; sand at about 700 g/m². TDS-LEVELX, R2, 12 Aug 2026, page 4
- ACTFLEX 300 tack coat: 15 kg pail primes about 45 to 75 m² per coat (45 used). TDS-ACTFLEX300, R2, 12 Aug 2026, page 3
- Neat finish layer over bulk fill: 3 mm. FORSPEC system figure
How many bags of LEVEL X PRO do I need?
Self-levelling compound, 20 kg bag
1.7 kg of powder per m² per mm (one bag makes about 11.7 L of mix). Bulk fill adds up to 20 kg of clean, dry 2 to 5 mm gravel per bag for about 19.2 L, then a neat standard-mix finishing layer (3 mm). Coverage is theoretical: rough or uneven slabs use more.
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0 bags
Where the figures come from
1.7 kg of powder per m² per mm (one bag makes about 11.7 L of mix). Bulk fill adds up to 20 kg of clean, dry 2 to 5 mm gravel per bag for about 19.2 L, then a neat standard-mix finishing layer (3 mm). Coverage is theoretical: rough or uneven slabs use more.
- Powder consumption: about 1.7 kg per m² per mm. TDS-LEVELXPRO, R2, 12 Aug 2026, page 2
- Yield per 20 kg bag; bulk fill: about 11.7 L with 4.4 to 4.6 L of water; + 20 kg gravel adds about 7.5 L. TDS-LEVELXPRO, R2, 12 Aug 2026, page 2
- Neat finish layer over bulk fill: 3 mm. FORSPEC system figure
How many bags of ACTFLEX BIOSET do I need?
Tile adhesive, 20 kg bag
From the TDS coverage table, using the top of each powder range so you do not run short. Your lift checks on site decide coverage, not the maths.
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Where the figures come from
From the TDS coverage table, using the top of each powder range so you do not run short. Your lift checks on site decide coverage, not the maths.
- 6 mm notch: 2.9 to 3.3 kg/m² (3.3 used); 6 to 7 m² a bag. TDS-BIOSET, R3, 11 Nov 2026, page 3
- 10 mm notch: 4.4 to 5.0 kg/m² (5.0 used); 4 to 4.5 m² a bag. TDS-BIOSET, R3, 11 Nov 2026, page 3
- 12 mm notch: 5.7 to 6.7 kg/m² (6.7 used); 3 to 3.5 m² a bag. TDS-BIOSET, R3, 11 Nov 2026, page 3
- Large format, back-buttered: 6.7 to 8.0 kg/m² (8.0 used); 2.5 to 3 m² a bag. TDS-BIOSET, R3, 11 Nov 2026, page 3
More: ACTFLEX BIOSET product page · Pools & tanks system · Internal wet areas system · Balconies & podiums system · Tile adhesives system
How much primer do I need?
EP 250, 700 PU, ACTFLEX 300, SUPERBOND 007, SUPERPRIME 008
The same primer figures the membrane calculators use, at the low end of each TDS range. The membrane's own TDS names the primer for your substrate: check it before you order.
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0 packs
Where the figures come from
The same primer figures the membrane calculators use, at the low end of each TDS range. The membrane's own TDS names the primer for your substrate: check it before you order.
- EP 250 per coat; kit yields: 0.32 kg/m²; 4 kg kit 12.5 m² one coat, about 6.3 m² two coats; 20 kg kit 62.5 and 31.3 m². TDS-EP250, R4, 12 Nov 2026, page 3
- 700 PU: 4 to 6 m²/L per coat (17 L at 4 m²/L = 68 m²). TDS-700PU, R2, 12 Aug 2026, page 2
- ACTFLEX 300 tack coat: 15 kg pail primes about 45 to 75 m² per coat (45 used). TDS-ACTFLEX300, R2, 12 Aug 2026, page 3
- SUPERBOND 007, dense substrates: 8 to 12 m²/L (8 used); 1000 mL pack. TDS-SUPERBOND007, R1, 25 Aug 2026, page 2
- SUPERPRIME 008, non-porous: 8 to 12 m²/L (8 used); 1000 mL pack. TDS-SUPERPRIME008, R1, 25 Aug 2026, page 2
How much PU injection resin do I need?
Polyurethane injection resin for leaking cracks
Crack volume = length × width × depth. The PU data sheets give no fixed rate per metre: estimate from the crack volume plus an allowance for porous zones, then check it on the first section. Packers every 200 mm, the most the TDS allows. Your pump also needs its own charge of resin to prime.
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0 packs
Where the figures come from
Crack volume = length × width × depth. The PU data sheets give no fixed rate per metre: estimate from the crack volume plus an allowance for porous zones, then check it on the first section. Packers every 200 mm, the most the TDS allows. Your pump also needs its own charge of resin to prime.
- Consumption: no fixed rate per metre: crack volume plus an allowance, confirmed by trial injection. TDS-PU200, R3, 12 Nov 2026, page 3
- Density at 25°C: 1.12 to 1.20 g/cm³. TDS-PU200, R3, 12 Nov 2026, page 2
- Packer spacing: 10 mm holes at maximum 200 mm intervals. TDS-PU200, R3, 12 Nov 2026, page 3
- Packs: 20 kg counted for all three resins. FORSPEC system figure
More: ACTFLEX PU200, PU300, PU500 product page · Negative side system · Concrete repair system
How much ACTFLEX ER300 do I need?
Structural epoxy injection resin, 15 kg set
Demand per metre = crack width (mm) × depth (mm), in mL. A 15 kg set yields about 13.9 L, so a 0.5 × 250 mm crack needs 125 mL a metre, about 110 m a set, before any allowance. Real jobs take more: voids, branching, priming, mixer waste and flushing.
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0 sets
Where the figures come from
Demand per metre = crack width (mm) × depth (mm), in mL. A 15 kg set yields about 13.9 L, so a 0.5 × 250 mm crack needs 125 mL a metre, about 110 m a set, before any allowance. Real jobs take more: voids, branching, priming, mixer waste and flushing.
- Demand per linear metre: crack width (mm) × depth (mm) = mL per metre. TDS-ER300, R1, 25 Aug 2026, page 6
- Yield of a 15 kg set: about 13.9 L at a mixed density of 1.08 g/cm³. TDS-ER300, R1, 25 Aug 2026, page 6
- Crack width range; packer spacing: 0.1 to 1.0 mm; 200 to 300 mm along the crack. TDS-ER300, R1, 25 Aug 2026, page 3
Video, data sheets and details
Everything for ACTFLEX 989 CWP
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Everything for ACTFLEX 929 HV
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Everything for ACTFLEX 101 UV
Everything for ACTFLEX 400 CLEAR
Everything for ACTFLEX 5000
Everything for PREFLEX 3000
Everything for SCREED X
Everything for FORCEM SCREED BINDER
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Everything for LEVEL X PRO
Everything for ACTFLEX BIOSET
Everything for FORSPEC primers
Everything for ACTFLEX PU200, PU300, PU500
Everything for ACTFLEX ER300
Membrane calculator, screed calculator, levelling calculator
Liquid membrane By area and coats
Sheet membrane Rolls and tape
Screed Bags by depth
Levelling Bags by depth
Tile adhesive Bags by trowel
Primer By substrate
Crack injection Resin and packers
How much do I need?
How much waterproofing membrane do I need?
Measure the floor and the walls to be coated in square metres, add an allowance for detailing, then divide by what one pack covers at the film thickness in the data sheet. For ACTFLEX 989 CWP one 18 kg kit covers about 8 m² at 1.2 mm dry in two coats, so 4 m² of floor and 8 m² of walls with 10% added is 13.2 m², or 2 kits.
How many coats of waterproofing membrane do I need?
It depends on the product and where it goes. ACTFLEX 989 CWP is two coats to 1.2 mm dry in wet areas and three coats to 1.5 mm in pools and below grade. ACTFLEX 906 WPU and ACTFLEX 929 are two coats to 1.2 mm dry. Each calculator shows the coats and the film it is working to.
How many bags of screed do I need?
Multiply the area by the thickness. SCREED X uses about 16 to 18 kg per m² for every 10 mm, so the calculator allows 18 kg: 20 m² at 40 mm with 5% waste is 76 bags of 20 kg. With FORCEM SCREED BINDER one batch of 20 kg of binder and 100 kg of sand makes about 61 litres of compacted screed.
How much self-levelling compound do I need?
LEVEL X and LEVEL X PRO use about 1.7 kg of powder per m² for every millimetre of depth. A 20 kg bag covers about 2.3 m² at 5 mm. Measure the depth at several points and use the average.
Do the answers include waste?
Yes. Every calculator has an allowance you can change, set to the figure the data sheet or FORSPEC recommends. Rough or porous surfaces and a lot of detailing use more. On site the dry film thickness decides whether a membrane passes, not the calculation.
Can FORSPEC check my quantities?
Yes. Send us your job with the drawings and FORSPEC replies within 6 business hours with the system, the quantities and the details for it.
More: all products · CAD details · wet area system · screeds and levelling · below ground
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