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DOWSIL™ Membrane Façade System from Dow

DOWSIL™ membrane façade system for façade sealing

Sealing critical areas

With energy regulations and climate policy targets establishing strict requirements for future buildings, installing systems that protect the building envelope from weather and ensuring that the building’s internal climate and living conditions can be maintained or improved is becoming increasingly important.

Gaps in construction and openings created for fenestration systems must be properly sealed to avoid convectional heat losses through air leakage and avoid entry points for moisture. Consquently, Dow has recently introduced a range of EPDM membranes with the added benefit of high quality Dow EPDM raw materials, to help increase their service life and long-term performance.

This new system for façade sealing consists of a choice of DOWSIL™ Membranes and DOWSIL™ 300 Adhesive, offering a complete high performance solution for the creation of interior and exterior weather and air-tight seals. Thanks to their ability to provide a flexible seal and protect areas including sharp angles and corners and seal across adjacent building elements, DOWSIL™ membranes tolerate normal building movement and inclement weather conditions including freeze/thaw. This new façade sealing system provides a smooth solution for vertical surfaces and ensures a secure closure of the building envelope.

Safe and easy to cut into shape and install, DOWSIL™ Membranes are recommended for use where a functional air-tight and weather-resistant seal is desired

DOWSIL™ Membranes must be bonded and secured in place using DOWSIL™ 300 Adhesive. With good initial grab, this flexible adhesive has a broad adhesion profile, and is supplied in 600ml foil packs, ideal for manual gun application.


The range

DOWSIL™ Membrane Dual

  • For indoor and outdoor use*
  • Provides vapor control according to EN 13984High water vapor resistance factor (μ-value = 100 000)
  • Available in:
    • Log roll lengths of 25m
    • 0.6mm, 1mm and 1.2mm thickness
    • Widths of 100mm, 150mm, 200mm, 250mm, 300mm, 350mm and 1.4m (other widths available on request)

DOWSIL™ Membrane Outside 0.6mm

  • For outdoor use only*
  • Provides vapor control according to EN 13984
  • Open to water vapor diffusion, permitting trapped moisture to dry out
  • Available in
    • Log roll lengths of 25m in 0.6m thickness
    • Widths of 100mm, 150mm, 200mm, 250mm, 300mm, 350mm and 1.4m (other widths available on request)

*Please refer to DOWSIL™ Technical Datasheets for DOWSIL™ Membrane Dual and DOWSIL™ Membrane Outside 0.6mm to assist with correct product selection.

DOWSIL™ 300 Adhesive

  • Adhesive for DOWSIL™ Membrane installation (SMP technology)
  • Excellent durable adhesion performance under wet conditions*
  • Isocyanate-free

* The substrate must be clean, tight and dry prior to the application of the adhesive


Membrane façade system application guidelines

Watch the video to review the application process.

Quick Links

NEW DOWSIL™ membranes
For air-tight sealing of building façades

DOWSIL™ building envelope solutions