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STRATEC II S - versatile synthetic roof underlayer :  


STRATEC II S is a versatile synthetic roof underlayer, HPV type (High Permeability to water Vapour) with a high resistance to tearing. It can be laid, either in the traditional way, either on continuous substrate. Due to its characteristics, STRATEC II S can be laid directly onto the insulation.

STRATEC II S has a double adhesive strip for the continuous junction of the longitudinal overlaps.

STRATEC II S holds the Roofing certification n 11-058

STRATEC II S can also be used as rain barrier.  


  • STRATEC II S is used as indicated in the DTU 40.1 and 40.2 to protect roofs with discontinuous elements (60 cm maximal centres) against the penetration risks of powdery snow, dust, soot or pollen.
  • STRATEC II S helps temporary the building to be kept weather-tight but must not exceed 8 days. Its high permeability to water vapour avoids condensation on the underside and protects elements of the bearing structure. Its white underside gives to attics a beautiful light.
  • STRATEC II S is appropriate as rainscreen for timber frame houses, in compliance with standards NF P 21-204-1 (DTU 31.2 - "timber frame houses and buildings") and NF P 65-210-1 (DTU 41.2 - "Exterior wooden cladding"). 



  • Density: 150 +- 10 g/m2
  • Nominal thickness: 0,50 mm
  • Topside: Non-woven polypropylene film
  • Intermediate membrane: Breathable polypropylene membrane
  • Underside: Non-woven polypropylene film
  • Dimensions of the roll:
    • - Length: >= 50 m
    • - Width: 1,50 +- 0,02 m
  • Weight of the roll: about 12 kg
  • Colour:
    • Non-slip light grey topside
    • Non-slip white underside avoiding slippage on rafters during installation
  • Marking: Each package bearing the CE marking
  • Packaging: 20 rolls lying down per pallet
  • Storage: On flat support, away from weather. Any changes in color of the foam does not affect product performance
  • Roll lengths are given with a tolerance of < 1 %.
  • Width of roll is given with a tolerance of 1% (UEAtc). Rolls must be stored upright on flat ground.


During storage, protect the rolls against moisture. In cold weather, we recommend that the rolls be kept at a minimum temperature of + 2oC (+36 oF) for at least 5 hours before installation.  


STRATEC II S is a roof screen and complies with EN 13859-1. It can be used as rainscreen in compliance with standard EN 13859-2  

Essential characteristics


Harmonised Technical Specification








N 13859-1 : 2010

EN 13859-2 : 2010


Reaction to fire


Resistance to water penetration


Tensile properties:

Tensile strength

- Longitudinal

- Transversal


- Longitudinal

- Transversal



315 +- 50 N/50 mm

250 +- 50 N/50 mm


61 [-20 ; +50] %

66 [-10 ; +50] %

Resistance to tearing (Nail shank)

- Longitudinal

- Transversal

255 [-100 ; +30] N

270 [-90 ; +30] N


Flexibility at low temperature (Pliability)


Artificial ageing behavior:

Resistance to water penetration

Tensile strength

- Longitudinal

- Transversal


- Longitudinal

- Transversal


295 +- 50 N/50 mm

225 +- 50 N/50 mm

45 [-6 ; +50] %

47 [-7 ; +50] %


Water vapour transmission properties (Sd)

0,05 [-0,03 ; + 0,04] m EN 13859-2 : 2010

EN 13859-2 : 2010

Additional characteristics


Test method

Dimensional stability

+- 1 %

EN 1107-2

Resistance to air penetration at 50 Pa

0,000 m3/(m².h)

EN 12114


Peel resistance of the adhesive (for overlap > 50 %)

60 N/50 mm

EN 12316

EST Classification

E1 Sd1 TR2

Certification n 11-058


STRATEC II S is laid in compliance with standards and DTU in force as well as installation rules for certified flexible roof underlayments (CSTB

guidelines n 3651-2).

- Traditional laying, stretched on rafters or roof trusses:

STRATEC II S is nailed with large head spikes or stapled on rafters.

- Direct laying onto insulation :

The water vapour permeability (HPV) of STRATEC II S allows to be laid directly onto insulation.

- Laying onto continuous support (batten, CTBH particule boards, CTBX plywood panels, etc):

The fastening is made with large head spikes (>=10 mm) through STRATEC II on the overlaps.  


Hygiene, health and environment: The product does not contain any substance likely to be detrimental to health or to environment and complies with generally admitted Health and Safety Requirements. For further information, please refer to relevant Safety Data Sheet.

Quality control: SOPREMA has always attached the highest importance to the quality of its products, to the respect of environment and men. For this reason, we apply an integrated management of the Quality and Environment certified ISO 9001 and ISO 14001


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