What is the K-2 butyl rubber tape?
K-2 is a double-sided butyl rubber tape for joining and sealing polyethylene-based roofing membranes, including PAROBARRIER and HYDROBARRIER. It is placed between overlapping sheets so that the adhesive layer bonds the two surfaces. This is not a visible roofing tape and does not replace mechanical fastening, proper overlapping, or the system detail around openings and junctions.
What is the size of the K-2 LT-5037 butyl rubber tape?
The LATIVA version is 15 mm wide and 25 m long, with SKU LT-5037. The narrow width is intended for a joining line inside the overlap, not for covering a large open defect. One roll provides up to 25 linear meters before cuts and interruptions. The required amount is calculated based on the total length of all joints and junctions.
Where is K-2 used when installing PAROBARRIER N90 or R110?
For N90 and R110, K-2 is involved in sealing all horizontal and vertical overlaps and junctions. The tape is placed in the contact zone between the sheets, then the joint is pressed according to the system detail. Official instructions specify K-2 together with AL-1; this means that in some nodes, the double-sided bonding and one-sided finishing have separate functions.
Is the K-2 butyl rubber tape also used with the VITROBARRIER facade membrane?
Yes, JUTA requires the overlapping sheets of VITROBARRIER to be joined with the K-2 installation tape. For the facade, the horizontal overlap is 15 cm and the vertical is 10 cm; K-2 seals the contact zone itself. The tape does not replace the mandatory ventilation cavity in front of the membrane and should not remain as a standalone exposed facade material.
What is the difference between K-2 and the double-sided M-2 tape?
Both are double-sided, but JUTA directs them to different materials. K-2 is a butyl rubber tape for polyethylene membranes like PAROBARRIER and HYDROBARRIER. M-2 is specially developed for waterproofing membranes and is used for membrane overlaps and junctions. Choosing by color or width is not enough; the exact instruction of the foil or membrane must be followed.
How many rolls of K-2 are needed for one vapor barrier?
The number is not determined only by square meters. Add up the length of all longitudinal and transverse joints, junctions to walls, beams, and openings, as well as places where the exact detail requires K-2. Divide the result by 25 m and round up, adding a reasonable amount for cuts and interruptions. Do not confuse this calculation with the required AL-1.
