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Sealing Better

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Increasingly, as every part of construction Industry is leaning towards “Green,” the roofing is moving towards more light transmittable material. Technological advancements in skylight designs today allow daylight to come in minus the glare and at the same time conserve energy. However, exciting roofing designs often spring a leak and by the time detected would have damaged the ceiling or even formed a puddle of water below.

Typical causes of a leaking glass or polycarbonate roof is the inadequate flashings, loose capping or perished seals. Sealants can fix seals temporarily but it is never the answer. Another major cause of leakage, especially in the metal roofs is fastener movement. Thermal shocks cause fastener to loosen and back out. 3M roof sealing application, Extreme Sealing Tape, 4412 N is a single coated tape designed to seal over an existing joint, seam or penetration. The backing on this tape is an ionomer film that is very tough yet flexible and yet abrasion resistant. The very soft and thick acrylic adhesive has excellent sealing properties and outstanding outdoor durability. The adhesive is designed to adhere well over the ionomer film to enable overlapping of the tape and yet provide a tight seam to itself and the joint or seam to be sealed.

The long term high temperature tolerance (days and weeks) of this tape is 93°C (200°F) while the short term high temperature tolerance (minutes and hours) of this film is 149°C (300°F). The immersion resistance, temperature resistance, high humidity resistance and temperature cycling resistance of Extreme sealing tape is demonstrated as below:

Extreme Sealing Tape has been subjected to accelerated aging tests, conducted at 3M Weathering Resource Centre at St Pauls, Minnesota. Over 2000 hours of accelerated aging exposure of the tape indicated on cracking or chalking of the 3M™ Extreme Sealing Tape 4412 N. The tape still had 10 pounds per inch width of peel adhesion strength.


Though, 3M Extreme Sealing Tape should be used as a proactive solution, in most cases, the product finds application after the damage has been done. In such cases, the first step is to remove the existing sealant in the gap which was leaking as there may be entrapped water inside. The surface has to be cleaned using Isopropyl alchohol and water (50:50). 3M™ Adhesion Promoter 111 is then used on the cleaned surface and then the tape is applied over the joint with the non stretch liner in place from corner to corner. It will then be rolled down with a roller and non stretch liner removed The entire operation can be completed in a day. From rain gutters to flashing and vents, Extreme sealing tape offers non sticky, fast installation and glossy aesthetic joint sealing solution.







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