We sell Pro Clima tapes because they are incredible products. They promise long-term airtightness that will last for 100 years, are highly flexible to stay airtight as your building moves and settles, and the solid acrylic adhesive involves no solvents, is moisture-tolerant, and is easy to apply. We could go on…
But key to the success of Pro Clima tapes is that they are able to fully adhere to the desired surface. If that surface is rough or uneven, or if it’s covered in construction debris, dust, and dirt, then the tape won’t be able to form an airtight bond. If the surface to which you’re taping isn’t airtight, then all bets are off. Also, the surface cannot be made of the same silicone that comprises Pro Clima’s backing strips and release paper… or it will release, as designed.
So how do you deal with these challenges to ensure that your adhesion is optimal, and that your building enclosure is fully airtight? With a little bit of extra care and attention, you can easily ensure the long-term performance and the permanent airtightness of your assembly.
Ensure a Clean, Dust-Free Taping Surface
Job sites can be messy. Construction generates a lot of dust and debris, and buildings-in-progress are subject to weather and exposed to the elements. The solid acrylic adhesive in Pro Clima tapes bond to almost anything – and that means that, if you tape to a surface covered in dust and dirt, dust and dirt are exactly what your tape will adhere to. And dust is not airtight. This will lead to incomplete adhesion between the tape and the intended substrate, and can significantly compromise the airtightness of your building enclosure.
Silicone, grease, and other slick fluids can also reduce the effectiveness of the tape. These materials drastically reduce the surface energy of the substrate. Surface energy is the sum of the small intermolecular forces that make bonding possible – so by reducing the surface energy of your surface, silicone or grease decrease the effectiveness of the bond.
But a little housekeeping goes a long way. Simply brushing the dust and small particles off of the substrate, or removing any grease, before taping can increase the effectiveness of the tape dramatically. Pay careful attention to corners, where dust can pile up and be trapped. Wiping with a damp cloth to ensure that the surface is as clean as possible will further enhance the effectiveness of the bond between the tape and the substrate. Just make sure the surface is dry before taping.
Use Primer on Uneven or Porous Substrates
Sometimes, even a clean surface isn’t ready for taping. Surfaces that are rough, cracked, uneven, or porous – like brick, masonry, OSB, and foam sheathing – are riddled with gaps that can serve as little conduits for air. Even if these materials themselves are airtight, their rough surfaces preclude an the formation of an airtight bond to tapes.
In these situations, TESCON PRIMER RP works wonders. Priming the surface creates a smooth, sticky, airtight substrate to which Pro Clima adhesive will easily form a lasting bond. Once TESCON PRIMER RP has been applied, you can immediately tape to the primed surface – no need to allow drying. The integrity of the bond between tape and substrate is essential to long-term airtightness – so when taping to rough surfaces like these, TESCON PRIMER RP can be make a decisive difference in building performance.
CONTEGA Adhesives: Attaching membranes at building joints
Attaching membranes to adjacent surfaces at building joints can be tough, because the connection between the membrane and the building element at the joint must be airtight. This is especially challenging if the surface is rough. Caulk will likely be the best solution – in which case we suggest CONTEGA HF, for a more traditional application of liquid-applied. For more on the similarities and differences between the two caulks, take a look over here. ProClima also offers a unique alternative solution with CONTEGA MULTIBOND. If the membrane you’re attaching is vapor-closed and impermeable, caulk would never be able to fully dry. CONTEGA MULTIBOND is a pre-cured line of adhesive that is activated by pressure, just as with adhesive in Pro Clima tapes. This allows for a flexible, instantly bonding joint adhesive suitable for interior and exterior use.
Because of its malleability, CONTEGA MULTIBOND can fill the cracks on an uneven surface for an airtight bond. For particularly rough surfaces, two strips can be applied to one another for extra protection. As always, it’s important to ensure that your surface is clean and dust-free before applying CONTEGA MULTIBOND. Once pressure is applied, CONTEGA MULTIBOND instantly bonds to both the substrate and the membrane – ensuring immediate and long-lasting airtightness.
CONTEGA MULTIBOND can be applied to a wide range of substrates, including plaster, concrete, masonry, roughly sawn or painted wood, OSB, and rustproof metal. Although priming the surface isn’t necessary in most cases, an adhesion test can tell you whether pre-treating the surface with primer could increase the stability of the system.
MULTIBOND can be applied in temperatures as low as 5°F (-15°C), and once applied will perform from -40°F to 212°F (-40°C to 100°C). Because summer roof temperatures in hot climates can reach as high as 75°C, that performance range is important.
Summing It Up
Pro Clima tapes are powerful tools for ensuring the long-term airtightness of your building. Investing a little bit of extra effort in making sure that they are applied properly can pay huge dividends in building performance and energy savings. That means ensuring that your taping surface is clean, free of dust, grease and silicone, and that your substrate itself is airtight. Do yourself this solid, and your blower door test will thank you.