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PHS Sd Variable Plus

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PHS Sd Variable Plus is a triple layer, high performance membrane, designed to adapt to its environment and alter diffusion rates accordingly, making it excellent for flat roof builds and retrofits.



Declaration of Performance

£199.99 net

In stock

SKU: AR9021-1

PHS Sd Variable Plus Membrane is a triple layer fabric, high performance membrane, made from non-woven PP fabric.

PHS Sd Variable Plus is a robust airtight membrane with a variable Sd value. It’s reinforced mesh material is designed to create an airtight barrier within the home. With variable diffusion resistance, this membrane can adapt diffusion rates depending on the environment. The membrane creates an airtight layer that dynamically adjusts based on the humidity of the environment, preventing condensation build up and moisture damage. PHS Sd Variable Plus is highly recommended for flat roof builds and retrofits.

Technical Details

Tensile strength (DIN EN 12311-1)*
     Lengthwise: >300N / 50mm
     Crosswise: >260N / 50mm
Tear strength (DIN EN 12340-1)*
     Lengthwise: >230N
    Crosswise: >230N
Temperature range: -20C to 80C
Sd value: 0.4m – 35m
Fire performance: class E
Water resistance: passed
Grammage: 103 g/m2 (±7 %)
CE certificate: passed
Core: 72 mm inner core diameter


  • Lay the membrane so that the printed side is facing the fitter.
  • The membrane should be applied perpendicular to the direction of the application surface i.e. studs, rafters and joists,
  • The membrane should be fixed with staples every 150mm or with PHS Double Sided Tape,
  • PHS Argo Joining Tape or a suitable PHS Grommet should be used for penetrations,
  • For bonding barrier overlaps, penetrations and repair spots, PHS Argo Joining Tape or a similar tape is recommended,
  • For connections co concrete or masonry PHS Internal Adhesive Sealant is recommended,
  • Ensure there is a 100mm overlap of the membranes and tape with PHS Argo Joining Tape or another suitable tape.


  Part Number: Size:  Box Quantity:   Barcode:
AR9093A 1500mmx50m 1


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