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Video

Pre-Insulation Foam Air-Sealing Strategies

Builder Nick Schiffer walks through air-sealing critical areas in a high-end home with Loctite TITE FOAM products before insulation is installed.

By Nick Schiffer

Sponsored by Loctite

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Pre-Insulation Foam Air-Sealing Strategies
Builder Nick Schiffer walks through air-sealing critical areas in a high-end home with Loctite TITE FOAM products before insulation is installed.
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      We are west of Boston at our New England Tudor build, and today we’re going to talk about some of the critical air-sealing details that NS Builders pays attention to before we insulate this house.

      Choosing a product

      One of the areas that we want to focus on is air-sealing around windows, so we’ll be using Loctite TITE FOAM Window & Door. We like to use TITE FOAM because it’s low expansion and won’t bow the frame as we’re filling that cavity. It’s also flexible, so with seasonal movement it will move with the building rather than crack.

      TITE FOAM application around window

      Applying the foam

      When applying, we make sure to get in and fill the entire cavity. It may take a few passes, and the foam might expand out into the interior space. In those cases, we let the foam dry, typically just overnight, and come back the next day and cut off the excess.

      Next, we move to the basement. While most of this home sits directly on top of the foundation, the front has joists that overhang the foundation. So on this project, we have floor joists that pass the blocking and create gaps.

      TITE FOAM application around floor joists

      For this application, we’re going to be using the Loctite TITE FOAM Gaps & Cracks for its flexibility as well as its adhesion. We want to make sure that we’re considering the building’s movement as well as the dissimilar materials. In terms of adhesion, the nice part about this foam is that it’s designed to work for multiple materials. And that’s important here in the basement when you’re bridging from foundation to mudsill,or even around floor framing and wall framing and sheathing products.

      TITE FOAM application around blocking
      Another area that we need to address is the blocking in between our rafters in our ventilated roof system. This is an important area because the blocking is acting as the air control layer. In the ventilated roof system we need to install a baffle, and that baffle is going to allow the fresh air to flow from the soffit all the way up to the ridge and above the insulation, so it’s really important to make sure it’s air-sealed. We don’t want any fresh air escaping through these cracks. So, for this assembly, we’re going to be using TITE FOAM Gaps & Cracks on either side to seal this up so all of that fresh air can ride above the baffle.

      When applying the foam, we use a nice, even pressure on the trigger. Make sure that you’re filling the gap completely while also being mindful that the product does expand. We go over it with one pass and make sure that we are filling the gap, and then take a step back and allow that foam to expand.


      RELATED STORIES

      • Better Vented-Roof Baffles
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      • Final Air-Sealing for a High-Performance Barndominium

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      1. kurt99 | Nov 24, 2022 09:56pm | #1

        It is pretty sad when you have to watch an ad before a sponsored video.

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