Powerlon Air & Vapour Control Layers

Powerlon VCL Air and Vapour Control Layer

  • Reinforced polyethylene with high tensile scrim reinforcement
  • Suitable for roof, wall and floor installations
  • CE Marking
  • Air barrier controls vapour to minimise interstitial condensation
  • Choice of grades, including flame retardant grades
  VCL 170 VCL 250 FlameOut Block
FlameOut Block Plus
Flame Retardant
NA NA BS 476 Part 12C
EN ISO 13501-1 Class B-s1,d0
BS 476 Part 12C
Class B-s1,d0

210gsm 285gsm 140gsm 210gsm
Vapour resistance 336MNs/g 530MNs/g 70MNs/g 130MNs/g
Colour Clear Clear Milky white Milky white
Standard Size 2.0 x 50m 2.0 x 50m 2.0 x 50m 2.0 x 50m


Powerlon Ultrablock AVCL

  • Reinforced polyethylene membrane incorporating an energy-saving thermo-reflective surface
  • Suitable for high humidity builds and for roof, wall and floor installations
  • Multipurpose membrane: airbarrier + thermo-reflective + vapour control layer
  • CE Marking
  • Air barrier controls vapour to minimise interstitial condensation
  • Choice of grades
  UltraBlock 300 UltraBlock 200
UltraBlock 150
UltraBlock SA
270gsm 104gsm 100gsm 190gsm
Vapour resistance >25,000MNs/g >630MNs/g ~600 Sd 25-35m >7,500 MNs/g
Colour Silver/Green Silver/Transparent Silver/White Silver/White
Standard Size

2.0 x 50m

1.6 x 50m 1.5 x 100m
2.7 x 100m
3.0 x 100m
1.5 x 100m



Powerlon AVCLs act as barriers to prevent moisture within the building’s warm air from reaching the insulation layer and forming interstitial condensation.

Powerlon AVCLs are polyethylene based vapour control membranes reinforced with a scrim to provide sufficient tensile strength in wall and roof installations.

Powerlon Ultrablock barriers are thermo-reflective reinforced vapour control layers incorporating encapsulated aluminium foil or metallised barriers layers to maximise energy efficiency.

Powerlon VCLs and UltraBlock membranes have CE Marking for "Flexible sheets for waterproofing – Plastic and rubber vapour control layers."

Industrial Textiles & Plastics Ltd is ISOQAR Quality Assured and certified to ISO 9001.

ITP's Building Team provides technical support and customer-specific service. Contact them on +44(0)1347 825200 or email powerlon@itpltd.com.




Suitable for roof, wall and floor installations, Powerlon VCLs can be used on warm and cold, supported and unsupported, ventilated and unventilated roofs. It is suitable for all roof types and walls in timber frame constructions. For high humidity builds, Powerlon UltraBlock is recommended.


Powerlon VCLs are installed on the warm side of the insulation. Vapour control layers are impermeable: they prevent moisture and warm air from reaching the insulate. Installed on the warm side of the insulate VCLs protect insulates from interstitial condensation. As impermeable air barriers, VCLs also increase the building's air tightness. The reflective foil surface improves the insulation characteristics by reflecting heat back into the build.

Full illustrated installation instructions are supplied with each roll

Powerlon Tapes, including Penetration Tape, FR Aluminium Tape and Double-sided Jointing Tape, complement the Powerlon UltraPerm range for professional installation. See Powerlon Accessories.


CE Marking is required for many products. It

  • shows that the manufacturer has checked that these products meet EU safety, health or environmental requirements
  • is an indicator of a product’s compliance with EU legislation
  • allows the free movement of products within the European market