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Flexlock pasta

Flexlock paste is a single component Bitumen Polymer liquid membrane designed for multi purpose projects.

The material features excellent adhesion, which dries to a tough, black seamless flexible waterproof membrane.

Flexlock paste exhibits excellent elongation and recovery properties and is suitable for high speed airless spraying applications. Moreover, Flexlock paste can behave as a vapor-proof liquid membrane.

Flexlock paste, has been authorized and approved by an international lab to block Radon Gas.

In addition, Flexlock paste is CE approved for roofing, ICC approved for below grade waterproofing.

 Product Uses:

-Waterproofing underground structures

-Waterproofing basements & cellars

-Waterproofing wet duty rooms

-Protection and dump proofing of underground concrete elements

-Waterproofing covered roofs and verandas

-Аs a repair structure for Flexlock membrane

Benefits & Advantages

Absolute waterproofing | High productivity | environmentally friendly | High strength and elasticity | Easy application | Excellent adhesion | Radon-tight |

 Same product grade for various applications | No need for Reinforcing Fabric on most substrates.

 Instructions for use

General instructions for all applications:

1. Flexlock paste may be applied by airless spray, roller, brush, or squeegee.

2. All surfaces to which Flexlock paste is applied must be sound, stable with an even finish and free from dirt, dust, loose debris, oil, grease etc. 

3. Flexlock paste may be applied to damp but not waterlogged surfaces.

4. Porous surfaces should be primed with a priming coat of a water-based Primer

5. Let dry for about 2-4 hours. 

6. New concrete can be waterproofed 48 hours after casting completion 

7. Where subsequent coats are to be applied, the first coat must be dry.

8. The waterproofing layer has to be protected before backfilling with soil. Protect the waterproofing membrane with Pazdrain or Pazdrain plus dimpled sheets.

 The compaction of the backfilled to a distance of 2 m (6ft) from the wall should be done by a manual vibratory hand held compactor.

No heavy compaction equipment should be allowed to travel close to the waterproofed wall. The backfill should not contain any stones over 40 mm.

Waterproofing of horizontal layers should be protected with nonwoven geotextile with a CBR puncture strength over 1000 kN (BS EN ISO 12236), and a layer of screed or concrete.

A. Below Grade Waterproofing (well drained soil)

1. Apply by airless spray / roller / brush / squeegee, a first layer at a quantity of 1.5-2.5 kg/m2 (3.0-5.0 gal/100 sq.ft). 

2. Let dry for 4 hours.

3. Apply a second layer at a quantity of 1.5-2.5 kg / m2 (3.0-5.0 gal/100 sq.ft). 

4.Let dry for 12 hours.

B. Walls with dampness

1. Apply three layers, achieving a total quantity of 3.2 kg/m2 (6.5 gal/100 sq.ft).

 Blind the final layer with clean sharp sand whilst still tacky. 

2. Re-plaster using a render modified with an acrylic alkali resistant emulsion.

C. Wet duty Rooms

1. Apply two layers achieving a total quantity of 2-3 kg/m2 (4-6 gal/100 sq.ft) per each layer.

2. Make sure that the first layer is dry before the second layer is applied.

D. Covered roofs and verandas

1. Make sure that all surfaces are sound, stable with an even finish and free from dirt, dust, loose debris, grease etc.

2. Apply with a spraying machine / roller / brush / squeegee, a first layer at a quantity of 1.5-2.5 kg/m2 (3.0-5.0 gal/100 sq.ft). 

3. Let dry for 6 hours.

4. Apply a second layer at a quantity of 1.5-2.5 kg / m2 (3.0-5.0 gal/100 sq.ft). 

5. Let dry for 12 hours. 

6. Сover with a nonwoven geotextile with a CBR puncture strength of over 1000 kN (BS EN ISO 12236)

7. Сover with a sound layer of screed or concrete slopped to drain

Technical Properties  





Brown paste

(dries to black membrane)

Specific gravity


Solid content

65% +/- 2% (wt)


3.0-5.0 kg/m2
(6.1-10 gal/100 sq.ft)

Dry film thickness

1.5-2.5 mm

(60-100 mils)


Non flammable

Service temperature:

-10?C to +60?C

(14°F to 140°F)

Application temperature:

+5?C to 40?C

(41°F to 104°F)

Heat stability



ASTM D 2939

Cold flexibility

(<8 °F)

ASTM D 522

Low temperature flexibility and crack bridging


Conduct @-26°C

ASTM C 836

Tensile Strength

> 0.5 MPa
(> 71 psi )

ASTM D 412

Elongation at break

> 600%

ASTM D 412

Resistance to water pressure 

> 0.5 atm, 24 hr 
(>7.3 psi, 24 hr)

DIN 52123

Water Vapor Permeance

0.45 perms


Water vapor transmission

2.0 m

SI 1731



ASTM D 412

Creep AT 80?C  

No creep

DIN 52123

Resistance to water


ASTM D2939

Bacterial attack in soil 30 days 40?C


ASTM D 3083

Crack bridging

> 5 mm

(>0.2 inch)

SI 1731


Waterproofing flat roofs (S1-S4) in accordance to ETAG 005 (certificate no. ETA 09/0017)

  1. Surface preparation – as above.
  2. Prime the surface where required with water-based Primer, diluted 1:1 with water, at a quantity of 250-300 gr/m2 (0.6-0.7 gal/100 sq.ft).
  3. Let dry for about 2-4 hours. 
  4. Apply Flexlock paste at a quantity of 2,0 kg/m².
  5. To the wet layer apply a polyester non woven geotextile 200 g/sq.m tensile strength 2.5 kN/m, CBR puncture test 0.5 kN and impregnate by a special roller until the geotextile is totally impregnated.
  6. Let dry for 4-6 hours
  7. Apply 2 kg sq.m of Flexlock paste over the impregnate geotextile.
  8. Apply two layers of the geotextile in corners and around penetrations in the roof, impregnate each layer separately with Flexlock paste, and after drying spray as in paragraph g. 
  9. Coating – it is recommended to coat the material with a high solar reflectance coating. Consult the manufacturer for instructions.





Resistance to water vapour

EN 1931

Sd value: 2.0 m

μ value: 1350

Water tightness

TR 003

dense: 0,1 atm over 24 h

Resistance to wind loads (fully bonded assembled system,: ii)


>80 kPa on concrete

Resistance to dynamic indentation


dense on concrete:
category I 2

on expanded

plastic slab: category I 1

Resistance to static indentation



on concrete: category L 2

on expanded

plastic slab: category L 1

user load category

on concrete P2 : I 2 / L 2

on expanded

plastic slab: P1 : I 1 / L 1

Resistance to fatigue movement

TR-008; 1000


W 3 1000 cycles / - 10 °C dense

Resistance to low temperatures

TR-006 at–20 °C

TL 3 - dense after dyn. / stat. indentation

EN 1109-2

- 10 °C

Resistance to high temperatures


+40 °C

adhesion: > 50 kPa


+90 °C

TH 4 – dense after stat. indentation: category L 2


Roof slope : S 1 to S 4

Resistance to heat ageing


70 °C

climatic zone category:

S severe;

working life category:

W 3 (400 d)dense after dyn. indentation

category I 2


50 cycles

at –10 °C

dense, no crack, no delamination

UV-radiation in the presence of moisture

TR-010 exposure:

1000 MJ/m² (W3)

–10 °C

EN 1109

dense, category: I 2-10°C

Resistance to water ageing



exposure time 60 days (W 3), dense, category L 2

Resistance to plant roots *

DIN 4062

proof in comparison with bitumen


ETA Classifications:

Application to the roof: 

Minimum layer thickness

1.8 mm

Water vapour diffusion resistance factor µ

? 1150

Resistance to wind loads

50 kPa

External fire performance EN 13501-5


Reaction to fire EN 13501-1

Class F

Statement on dangerous substances

Does not contain any


Levels of use categories according to ETAG 005 with relation to: 

Working life


Climatic zones

M and S (Moderate and Severe)

Imposed loads

P1 to P2 (Low to Moderate on less compressible substrate, e.g Concrete/steel)