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Tools & Materials

Backyard Tape Test: 10 Months Later

By Martin Holladay Issue 240 - Dec 2013/Jan 2014
Article Image
Martin Holladay

In the fall of 2012, I tested the performance of 11 air-sealing tapes by attaching samples to six different substrates mounted on the exterior wall of my woodshed. A month later, I tried to remove the tape samples to determine which tapes were most tenacious. I reported my findings in “Backyard Tape Test,” FHB #234.

Ten months after the initial test, I revisited the test site to see which tapes were holding up. Here’s the good news: Several of the tested tapes were still hanging on remarkably well. In fact, a few tapes even seemed to have gotten more tenacious over time.

Three of the most impressive tapes from the original test were Siga Sicrall, Siga Wigluv, and 3M All Weather Flashing Tape. Siga Sicrall was the best performing tape on XPS. Ten months later, the Siga Wigluv and 3M All Weather Flashing Tape both still were clinging tightly to the plywood and the OSB.

Just because a tape does well on one substrate doesn’t mean that it will work well on another. For example, Zip System tape performed well on housewrap, but it fell off the XPS at some point during the past 10 months.

On the other hand, some tapes that didn’t seem particularly strong after a month fared better after 10 months had passed. Tapes in this category include Pro Clima Tescon No. 1, the 3M tape, and Zip System on OSB; Venture 1585 HT/W on housewrap; and Pro Clima Tescon No. 1 on polyethylene. The apparent reason for this finding: The bond created by a high-quality acrylic adhesive is slow to develop, so tapes in this category may get more tenacious with time.

OSB: Two tapes performed very well: Siga Wigluv and 3M All Weather Flashing Tape.

Plywood: Five tapes did very well: 3M All Weather Flashing Tape, Zip System, Siga Wigluv, Siga Sicrall, and Pro Clima Tescon No. 1.

Polyethylene: Four tapes performed very well: Polyken Shadowlastic, Siga Wigluv, Siga Sicrall, and Pro Clima Tescon No. 1.

XPS: This test taught me that XPS is one of the hardest substrates to tape; it’s even harder to tape than OSB. The best of the tested tapes on XPS was Siga Sicrall. (Note, however, that the manufacturer of Siga Sicrall recommends the tape for interior use only. The best-performing exterior-rated tape on XPS was Siga Wigluv.)

Foil-faced polyisocyanurate: Foil-faced polyiso is very easy to tape; almost any decent tape will work.

Housewrap: Most of the tested tapes performed well on housewrap.

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