What is the purpose of the AL-1 aluminum tape in roof insulation?
AL-1 is a single-sided foil self-adhesive tape used for sealing details in roofing membranes. JUTA recommends it for joints around chimneys and ventilation elements, for repairing cuts, and for covering areas with nails or staples. It restores the local continuity of the membrane but does not replace the proper flashing detail or the non-combustible clearance around a chimney.
What size is the AL-1 aluminum tape roll with SKU LT-5043?
The active version in LATIVA is 48 mm wide and 50 m long, with SKU LT-5043. The width determines the area the tape can cover around a joint or penetration, and 50 m is the nominal length before cuts and waste. For quantity calculation, measure joints, connections, and repair points separately instead of using only the membrane’s square footage.
Is AL-1 suitable for the joints of PAROBARRIER N90 and R110?
Yes, JUTA’s official instructions for PAROBARRIER N90 and R110 require horizontal and vertical overlaps and joints to be sealed with AL-1 and K-2 bonding tapes. AL-1 works on one side over the finished area, while K-2 is a double-sided butyl rubber tape used in the joint. The exact arrangement follows the installation detail of the chosen membrane, not a general scheme for all membranes.
Can AL-1 repair a staple hole or small cut in the membrane?
Yes, JUTA recommends AL-1 for sealing areas around fasteners and repairing cuts in roofing membranes. The tape must cover the defect with sufficient contact area on sound material. For large tears, dirty surfaces, or missing sections, do not rely solely on tape; a repair detail or replacement of the damaged membrane is needed.
Are the AL-1 aluminum tape and the K-2 butyl rubber tape the same?
AL-1 and K-2 are not the same. AL-1 is a single-sided metallized tape for visible sealing, local repairs, and joints. K-2 is a double-sided butyl rubber tape mainly intended for joining overlapped polyethylene membranes like PAROBARRIER and HYDROBARRIER. Both can be part of the same system detail but are not interchangeable just because they are used for air and vapor tightness.
Can AL-1 be used with any membrane and on any slope?
Universal compatibility should not be assumed. JUTA prescribes AL-1 for specific systems, for example with PAROBARRIER and certain details of HYDROBARRIER or ANTICONDENSATE. The type of membrane, substrate, slope, and exposure determine whether AL-1 is the right tape. For other manufacturers or unknown materials, technical compatibility must be checked rather than relying solely on the aluminum surface.
