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Novia Reflex Reflective Breather Membrane

Suitable for pitched cold and warm roofs and insulated wall applications.


A high quality, versatile low cost reflective breather membrane. The material complies with both EN 13859-1 (roofs) and 13859-2 (walls). When used in suitable construction, this membrane will deliver improved R and U-values. The product has exceptional water resistance characteristics but still provides high breathability. It is also strong, having excellent tensile and nail tear strength. Novia Reflex also complies with EN13501-1 fire classification grade E.


  • Single product for all roofs and walls.
  • Tri-laminate membrane with low emissivity and high reflectivity.
  • Breathable membrane with maximum waterproofing properties – EN 1928 W1.
  • Significantly higher breathability than most other similar reflective products.
  • Grade E (Fire).
  • Install as per BS 5534:2014 + A2 2018 UV guidance.
  • High tensile and nail tear strength.
  • CE compliant to EN 13859-1 (roofs) and EN 13859-2 (walls).
  • Complies with new European CPR rules.
  • Cooler in summer and warmer in winter.
  • Tested for new BS 5534 wind uplift requirements.


Suitable for pitched cold and warm roofs and insulated wall applications.

General information


Reflective breather membrane


Breathable microporous film




1.5 x 50 m

Uniclass 2015

Pr_25_57_10_94 Vapour permeable sheetsPrimary


H20/150 Sheet cladding

H20/155 Sheet cladding

H21/110 Vertical timber weatherboarding

H21/111 Horizontal timber weatherboarding

H21/115 Vertical timber weatherboarding

H21/116 Horizontal timber weatherboarding

H21/130 Breather membrane

H21/20 Breather membrane

H30/110 Fibre cement

H30/120 Fibre cement

H30/350 Breather membrane

H30/50 Breather membrane

H31/280 Breather membrane

H31/55 Breather membrane

H60/105 Clay roof tiling

H60/110 Clay roof tiling with counterbattens

H60/120 Concrete roof tiling

H60/125 Concrete roof tiling with counterbattens

H60/145 Clay vertical tiling

H60/155 Concrete vertical tiling

H61/105 Roof slating

H61/110 Roof slating with counterbattens

H61/120 Vertical slating

H62/105 Roof slating

H62/110 Roof slating with counterbattens

H62/120 Vertical slating

H62/125 Roof slating

H62/130 Roof slating with counterbattens

H62/140 Vertical slating

H62/145 Roof slating

H62/150 Roof slating with counterbattens

H64/110 Wood shingle/ shake roofing

H64/120 Wood shingle/ shake roofing with counterbattens

H64/130 Vertical wood shingle/ shakes

H65/105 Clay roof tiling

H65/110 Clay roof tiling with counterbattens

H65/115 Concrete roof tiling

H65/120 Concrete roof tiling with counterbattens

H65/125 Reconstituted slate roof tiling

H65/130 Reconstituted slate roof tiling with counterbattens

H65/135 Ceramic slate roof tiling

H65/140 Ceramic slate roof tiling with counterbattens

H67/110 Metal roof tiling

H67/120 Metal roof tiling with counterbattens

H67/130 Metal vertical tiling

H92/120 Rainscreen cladding

H92/785 Breather membrane

K21/111 Wood floating floor

M30/265 Building paper

P10/320 Breather membrane

P10/65 Breather membrane

Specification data - Vapour permeable sheets Enhanced data

Product Reference

Novia Reflex Reflective Breather Membrane


EN 13859-1 and -2

Class (minimum)

W1 Water tightness

Weight (minimum)

131 gsm

Reflective face


Roll weight

10 kg


131 g/m²

Tensile strength MD/CD

270/225 N/50 mm

Elongation MD/CD


Tear resistance MD/CD

150/220 N

Resistance to air penetration

0.000 m³/m³h.50.pa

Sd value

0.05 m

Resistance to water penetration

W1 >250: Class cm

Resistance against fire

E Class

Temperature resistance


UV resistance

Install as per BS 5534: 2014 + A2 2018 UV guidance

UV guidance install to BS 5534:2014 + A2 2018


0.18 Ɛ

Emissivity (aged)

0.19 Ɛ


Novia Breather Membrane Lap Tape

Novia Double-sided Adhesive Tape

Standard product features


Metallic/ white.


Reflective breather membrane.


Breathable microporous film.




1.5 x 50 m.

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