When is the adjustable vapor barrier PAROBARRIER VAP used?
PAROBARRIER VAP is intended for rooms with variable humidity, such as periodically occupied houses, and for energy-efficient constructions where an adjustable vapor barrier is needed. JUTA also recommends it for insulation over beams without dismantling the existing ceiling layer. The choice must be confirmed with the moisture-technical detail, not just by the general term "vapor barrier."
What material is the PAROBARRIER VAP membrane made of?
VAP is a two-layer membrane. The non-woven polypropylene layer provides mechanical strength, while the second layer with a special coating limits and regulates the passage of water vapor. This is a different construction from the reinforced polyethylene foils N90 and R110. Therefore, VAP requires its own installation and connecting materials, without automatically transferring details from another model.
What are the size, thickness, and strength of PAROBARRIER VAP?
The PAROBARRIER VAP roll measures 1.5 x 50 m, or 75 m² nominal area. The manufacturer specifies a thickness of 0.32 mm and tensile strength of 180/150 N per 50 mm in both directions. These values identify the exact product but do not determine the usable area after overlaps. For quantity, all joints, abutments, and cuttings for the specific construction must be added.
What does it mean that PAROBARRIER VAP is an adjustable vapor barrier?
The special functional layer of VAP regulates the movement of water vapor through the material, instead of acting like a conventional fixed polyethylene foil. The manufacturer associates this with a greater drying reserve for the pitched roof structure and with reducing excess moisture during summer and construction. The effect depends on a properly designed entire structure, not just the membrane.
Which tape should be used to seal the joints of PAROBARRIER VAP?
JUTA explicitly states that all horizontal and vertical overlaps and abutments of PAROBARRIER VAP must be sealed with the UNI connecting tape. The goal is to prevent water vapor from bypassing the membrane through open joints. For quantity calculation, measure the total length of joints and details, not just order tape based on the foil’s square footage.
Can PAROBARRIER VAP replace N90 in every roof structure?
No, VAP should not be considered a universal substitute for N90. VAP is an adjustable two-layer membrane for constructions with variable moisture regimes, while N90 is a reinforced vapor-tight foil. The suitable model depends on the room usage, layer arrangement, and the structure’s ability to dry. If the detail is unclear, a moisture-technical check is required before ordering.
