SAMAC | Rooftec Breathable Membrane 140gsm


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Do you want a premium roofing membrane that boasts strength and vapour permeability? Buy the Rooftec 140gsm Breathable Membrane as a solution for majority of roofing projects.

Discover the popular properties of SAMAC's Rooftec 140gsm breather: a robust and airtight roofing membrane! Dry Verge understand the enhanced strength, optimal vapour permeability and superior airtightness make this membrane a popular choice. Perfect for many roofing projects, including supported and unsupported installations with tiles or slate, Scottish sarking boards, warm and cold roof applications, and timber or metal frame constructions.
  • BBA certified
  • Vapour permeable
  • Waterproof membrane
  • Resistance to extreme temperatures
  • Conforms to BS 5534.2014 Annex A 

Product Specifications:

Width: Available in 1m & 1.5m
Length: 50m
Weight: 140gsm
Thickness: 0.70mm
Material: Polypropylene
Reaction to fire: E-d2 Class
Water vapour resistance: 0.02m (-0,0020/-0,005)
Resistance to water penetration: W1

Data Sheet:

Fitting Instructions:

  • The ceiling is well sealed Roof ridge height is not greater than 15 metres
  • Roof pitch is between 12.5° and 75°
  • Site altitude is not greater than
  • 100m above sea level


Installing Rooftec membrane is straightforward. Place it directly over the rafters on the insulation, running it horizontally across the whole roof. The membrane should overlap at the ridge by at least 20cm, with an additional 15cm overlap along the red guideline. For pitches below 22°, overlap should be 20cm or greater.
Mask any seams, overlapping, butt joints, or damage on the membrane with Samac's membrane adhesive tape. Connect to other substrates such as masonry using silicon or self-adhesive butyl tapes.


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If you need any further support when buying any roofing membranes/breathers, get in contact with the helpful Dry Verge and Roofline Direct team: 

Call: 01622 296228 

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