Performance. This is what matters.
While ThermalBuck is easier to install and flash than a wood buck, it’s the performance that interests most architects and builders. ThermalBuck is made of a type XIV EPS with a density of 3 pcf, and coated in a waterproof resin. It’s lightweight and flexible, yet surprisingly strong and durable, handling loads of 70 lbs. per linear inch. The compressive strength is 52 psi.
ThermalBuck supports the weight of heavy, triple-pane insulated frame windows, and prevents compression of the exterior insulation. The unique “L” shape is designed to transfer both wind & shear loads to the structure itself. Unlike a traditional wood buck, ThermalBuck will not warp or shrink over time, and helps to maintain the integrity of the window installation.
ThermalBuck insulates the mounting points of windows & doors with an R-value of 4.4 per inch. It prevents condensation by limiting thermal bridging around windows and doors. Both the waterproof coating and installation with approved air & water sealants helps to create an additional air & water barrier in the building envelope.
Technical Downloads & Testing Reports
The testing environment for ThermalBuck simulated a 600 lb. window, and ThermalBuck was installed with only the Dow Corning 758 Sealant. ThermalBuck didn’t fail – the wall failed. ThermalBuck outperformed the wall structure itself.
ThermalBuck is classified as thermal insulation. To qualify as a flashing agent, we require installation with Dap Dynaflex 800 Premium Modified Polymer Sealant (or other approved sealants), then fasten directly into the structure with 2.0″ roofing nails every 10″ – 12″. The window nail flange (3 sides) and WRB transitions (all) must be covered with flashing tape. Consult the WRB manufacturers’ installation instructions for recommendations.
PHIUS Verified Window Installation:
Alpen 925 Zenith Nail Fin Window + 2.5″ ThermalBuck
Energy efficient windows are an essential component of any high-performance building. But the installation was always a challenge for nail flange windows, which have to be mounted on the same plane as the exterior insulation.
In 2017, ThermalBuck teamed up with North-American passive house window manufacturer Alpen High Performance Products to introduce their PHIUS Verified Window Installation Detail featuring the Alpen 925 Series Fiberglass window with 2.5″ ThermalBuck window buck.
PHIUS Verified Window Installation Data:
ThermalBuck effectively limits thermal bridging at the rough opening, provides a superior air & water barrier than a wood buck, and also a strong support for the weight of the window.
Passive house designers and builders now have the data they need to confidently include ThermalBuck into their specifications.
The Alpen HPP Zenith Series ZR-9/ 925 window features up to R-9.1 insulation, 99.5% UV protection, insulated frames, and Alpen Glass, Alpen’s renowned Suspended Film Technology. Every Alpen window has 9 key design features that make these highly engineered windows some of the best in the industry. Read more about the technology and craftsmanship of Alpen windows here.
Alpen High Performance Products is a national distributor for ThermalBuck. thinkalpen.com
People often look at ThermalBuck and ask, “How did you come up with this idea?” Like any good idea, it starts with figuring out you’ve got a problem in the first place. And that’s exactly how this whole process began. John Brooks, developer of ThermalBuck, built his family an extremely energy-efficient, well-insulated house. And he was surprised with how frustrating and difficult it was to install the windows. So you’ve added exterior insulation to a building, and… Read more
BRINC Building Products, Inc. is proud to announce that the BASF Corporation will feature ThermalBuck as a continuous insulation solution in their 2019 exhibit at the International Builders Show on February 19-21st in Las Vegas, Nevada. High-performance builders have consistently used a combination of interior and exterior insulation to achieve desired R-values for their wall assemblies. With the rapid adoption of advanced energy codes across the U.S., and increasing demand by consumers for energy-efficient homes, use… Read more
Working for Habitat for Humanity is a life-changing experience. We knew going into the high-performance home build in Randolph, Vermont, that the work was important. Affordable housing is one of the most critical issues in communities all over the world – and Vermont is no exception. But what we didn’t know, was that we would be most impacted by the people. Join us as we work with the team of volunteers in Central Vermont, and… Read more
Habitat for Humanity’s vision is simple: A world where everyone has a decent place to live. It’s achieving it that’s the complex part. The team at the Central Vermont Habitat for Humanity (CVHFH) is working hard towards that goal, and an even loftier one – building one of the highest performing Habitat for Humanity homes to date, in Randolph, VT. Energy Efficiency: an Essential Need Building to higher energy-efficient standards is an important consideration… Read more
You’d have to live under a rock (completely sustainable housing) if you didn’t realize that climate change, and rapidly increasing energy prices are a hot topic in today’s world. But why is the focus on the building industry? Buildings consume nearly half of all the energy produced in the United States. Globally, the percentages are even higher. Which explains why much of Europe is paving the way in both commercial and residential energy-efficient building. It’s important to understand… Read more
Improving the energy-efficiency of new and existing construction has long been a focus of the building industry. When it comes to insulation, exterior is the choice of many architects and builders, because it eliminates the thermal bridging through the studs. However, continuous insulation presents its own unique challenges with installing windows and flashing the rough openings. The mounting point is no longer flush with the sheathing, it must be extended out to meet the exterior insulation depth.… Read more