There’s lots of situations where it would make sense to apply PROSOCO’s new fluid-applied air-sealing material – Targeted Interior Air Seal, and one of them was recently captured in real life.
Travis Brungardt of Catalyst Construction got his hands on the product, launched in 2025, and used it on one of his projects in the Kansas City area earlier this year. It was a renovation of a brick-clad 1950s house. Part of the house’s renovation involved installing a continuous water and air control layer. However, the complexities of the façade prevented Brungardt from ripping off the exterior to access the guts of the wall so he could seal up the transitions around sheathing boards, rim joists, and any transitions where air leakage can occur.
“I don’t have access to the outside (of the home),” Brungardt said. “Complexities of the renovation prevented me from ripping off the exterior to get the continuity of water and air control I’m used to over the entire outside. So how do I achieve air control but address it from the inside?”
Jake Boyer, President of PROSOCO, joined Brungardt to demonstrate a new product that would solve this problem. Designed for new construction or restoration/renovation/retrofits, Targeted Interior Air Seal is applied from a building’s interior to seal up the transitions, seams and connections between building envelope components (an interior air barrier application is also known as a negative-side air barrier).
Travis found TIAS to apply incredibly quickly (he referred to it as “speed caulking” when he saw it up close) and said it would enable the same type of performance you’d expect from a fluid-applied air-sealing application from the exterior.
Together, Jake and Travis looked at the interior side of the house and all the transitions where it would make sense to apply TIAS. According to the product’s Data Sheet, TIAS can be installed “around all through-wall penetrations and along joints and seams that separate conditioned from non-conditioned spaces where air leakage is most likely to occur. This includes seams that separate:
• The mudsill from the concrete slab
• The bottom plate from the mudsill
• The bottom plate from the sheathed floor assembly
• The top plate from the second top plate
The product is also touted as offering advantages over spray foam -- such as no-gassing, material flexibility, and containing no solvents, isocyanates, or phthalates. Compared to similar products that are aerosolized sealants, TIAS offers precision in its application, meaning only the areas intended to be sealed are treated. According to their website, TIAS requires "no pressurization of the whole house, and no shutting down of other projects or work."
For Travis, the priority was addressing the board sheathing behind the bricks, the joints between the board sheathing, the perimeter around the stud cavity, the top-to-double-top-plate connection, and the floor-to-sill connection.
Specifically, Travis said that sealing the “board sheathing behind the brick work would be a nightmare for me to solve in terms of labor.”
“This saves time and labor by working from the inside as opposed to having to do the exterior renovation,” added Jake.
On this project, Travis used a bulk extraction gun, which he pulled out like a syringe to suck up the material and then spray onto the substrate. “Just put your cone tip on there or whatever tip you are using, and apply it just like you would any sausage material,” Jake said.
TIAS can also be applied with a sprayer-dispenser, airless sprayer, battery-powered sprayer or backpack sprayer.
TIAS is compatible with R-Guard Cat 5, Joint & Seam Filler, and FastFlash, which can be used as intended to complement the air-sealing capability of TIAS.
Travis also appreciated the product’s bright yellow color, stating that it makes it easy to come in and immediately assess any weakness or failure.
Before applying TIAS, Jake recommended making sure to sweep out and prep whatever substrate you’re dealing with. Once the application began, Travis said, “it looks like speed caulking. It’s flying as compared to the pace that I would normally be able to hit.” As the product installation went on, Travis began to understand its potential. “Any two things you want continuity in between, TIAS is a good system to put it where you need it.”
The importance of making a connection between wall components should not be underestimated, Jake said.
“The stack effect is what drives the air infiltration and exfiltration in building envelopes, so if we can address the foundation wall to the mudsill, the rim joist, bottom plate, and sub floor, all those details create an interface where air can get in, so those are the places we want to address,” he said.
Ultimately, Travis was positive about the potential of the new product. “I’m extremely confident in the long-term performance of this house.”
Learn more about Targeted Interior Air Seal.
