Where is the PAROBARRIER N90 vapor barrier foil installed?
PAROBARRIER N90 is installed on the inner, warm side of the insulation. JUTA defines it as a vapor-tight protective layer for insulated pitched roofs and internally insulated walls. The foil limits the penetration of water vapor from the room into the structure. It is not an external super-diffusion membrane and should not be confused with the under-roof layer above the insulation.
What layers make up PAROBARRIER N90?
PAROBARRIER N90 is a three-layer foil: a supporting reinforcing mesh made of polypropylene and two layers of polyethylene. The mesh provides mechanical strength, while the polyethylene layers perform the waterproofing and vapor barrier functions. This construction is specific to N90 and should not be described as a nonwoven diffusion membrane. When cutting, protect the sheets from punctures that break the airtight layer.
What size and technical specifications does a roll of PAROBARRIER N90 have?
The official size of PAROBARRIER N90 is 1.5 x 50 m, i.e., 75 m² nominal area before overlaps. JUTA specifies a thickness of 0.17 mm and tensile strength of 210/190 N per 50 mm in both directions. The usable area is smaller because all joints and connections must be executed with the necessary overlap and sealing.
Is there a front side when installing PAROBARRIER N90?
For PAROBARRIER N90, the manufacturer allows fastening with either side facing the room. This rule applies specifically to the N90 model and does not automatically apply to the reflective R110 or other vapor barriers. More important is that the foil forms a continuous layer on the inner side of the insulation, without open joints, tears, or unsealed cable or pipe penetrations.
How are the joints of PAROBARRIER N90 fastened and sealed?
JUTA permits horizontal or vertical installation to wooden supporting elements using staples or galvanized flat-head nails. All horizontal and vertical overlaps and connections must be sealed with the designated bonding tapes AL-1 and K-2. For future cladding, battens or profiles are recommended so that the cladding fasteners do not randomly puncture the foil.
How does PAROBARRIER N90 differ from R110 and VAP?
N90 is a reinforced vapor-tight foil without a reflective aluminum layer. R110 has an aluminized surface and requires specific orientation and an air gap for the reflective function. VAP is a two-layer adjustable vapor barrier membrane for constructions with variable humidity. The three products are not interchangeable by size alone; the choice depends on the moisture regime and the exact construction detail.
