PHS Sd Variable Plus

Mesh Reinforced Airtight VCL Membrane - Variable Sd

Robust and flexible airtight membrane with a variable Sd value 0.4 – 35m. Excellent for flat roof builds and retrofits and suitable for air-injected insulation and insulation mats.

Features

Premium Quality
Cost Effective
Technical Support
Installation Guides

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

Applications:

Interior installation to create an airtight envelope.
All construction types.
Especially suited to flat roofs and retrofits.
Ceilings, walls, floors and loft spaces.

Features & Benefits:

Robust and flexible.
Highly tear resistant.
Variable diffusion resistance.
Moisture variable, sd value 0.4 – 35m.
Suitable for air-injected insulation and insulation mats.

Location	Internal
System	Airtight, Retrofit
Colour	Grey Graphics on White
Elongation Longitudinal	24%
Elongation Transverse	24%
Mass Per Unit Area	103g/m²
Material	Airtight Membrane
Resistance to Fire	Class E
Roll Area	75 m²
Roll Weight	7.7 kg
Water Vapour Resistance - Sd Value	0.4 – 35m, Variable
Size	1.5m x 50m
Tear Resistance Longitudinal	230 N
Tear Resistance Transverse	230 N
Tensile Strength Longitudinal	387 N/50mm
Tensile Strength Transverse	387 N/50mm
Thickness	0.27mm
Water Penetration Resistance	Class W1
Application Area	Ceiling, Internal Wall, Loft Space
Type of Build	Block, Steel Frame, Timber Frame
Airtight	<0.01 (m³/(m²H50Pa))
Approx Coverage	67 m²
μ=Value	48,148

Application

Installation Guide:

Lay the membrane so that the printed side is facing the fitter.
Lay the sheet parallel or at a right angle to the rafters with an overlap of at least 10cm.
Ensure flush-mounted bay insulation, there should be no cavities between the bay insulation and membrane.
The membrane is translucent making it easier to see markings, measurements and fixtures.
Fit the membrane free of tension and avoid creases.
Overlaps, component joints and penetrations must be made airtight with PHS sealing products including tapes and sealant.