ThermalBuck™ extends the mounting point for windows & doors, and insulates the rough opening to limit thermal bridging. 

How it works

Window installation with exterior insulation is a challenge. Solve the problem with ThermalBuck™.

Installation Steps

ThermalBuck™ outperforms a traditional wood buck, and saves time on your window installation. 

ThermalBuck vs. wood

If a window isn’t installed properly,
it won’t matter how energy efficient it is.


High performance wall assemblies are becoming more common as builders work to make homes more energy-efficient, and meet energy code requirements. But builders know attaching windows with rigid foam or mineral wool isn’t easy.

ThermalBuck™ solves the challenge by extending the mounting point for windows & doors to create a flush plane for cladding, and allows structural attachment of the window. Simple to install and easier to flash than a wood buck, it saves both time and money.

The continuous solution for the high-performance building envelope.

ThermalBuck Goes Rogue with Matt Risinger

Matt Risinger is a well-known talent in the building industry. Not only for his fine craftsmanship as high-end home-builder Risinger Homes, but also as a building science expert and educator.

Based in Austin, Texas, Matt appears at building events and trade shows across the U.S., and creates easy-to-follow, real-world content from his construction sites (that’s a lot of fun to watch) for his avid followers on social media.

Matt recently featured ThermalBuck™ on Risinger Goes Rogue, as a smart, simple solution to the challenges builders face when installing windows with continuous insulation.

WATCH:  Risinger Goes Rogue featuring ThermalBuck™   

News & Events

Building Energy-Efficient Bridges in Pittsburgh July 25, 2017

As one terribly clever energy professional pointed out – a city with 446 bridges couldn’t possibly be intimidated by hundreds of pages of building codes. “Bridges to the Future” was the theme of the 2017 National Energy Code Conference, which took place July 18th – 20th in Pittsburgh, PA.  The third city to become part of the 2030 District, and commonly known as “The City of Bridges,” Pittsburgh proved a fitting venue in which to focus… Read more

ThermalBuck™ Performs at the 2017 PCBC June 30, 2017

The biggest builder’s show on the west coast lived up to the hype – we had an amazing experience in San Diego at the 2017 PCBC. We were fortunate to head into the show a Parade of Products award winner (featured in the May 2017 issue of Professional Builder Magazine) and a presenter in the High-Performance Home Theater. But the real excitement started when we hit the trade show floor. High Performance Wall & Attic Display ThermalBuck™ was a… Read more

Alpen Certified Installer attaching window into ThermalBuck

 Simplify Window Installation

ThermalBuck™ solves multiple problems when using exterior insulation and/or rainscreens. It extends the mounting point of windows & doors, and allows for direct structural attachment. ThermalBuck™ is part of a continuous insulation solution, and an essential part of the efficient building envelope. 

Consult the window manufacturers recommendations, then add an additional 1/2″ on all 4 sides to accommodate ThermalBuck™.  (see installation for example)

Side by side rough openings with ThermalBuck window buck installed shot from interior


 Improve Performance and Efficiency

ThermalBuck™ simply does more than a wood window buck. It insulates the mounting points of windows & doors, and simplifies flashing. Dimensionally stable and strong, ThermalBuck™ prevents compression of rigid insulation, and helps to maintain the integrity of the window installation. 

R-values range from 4.4 to 11. View the results of our thermal testing and see how ThermalBuck™ outperforms wood 2:1.  

Build Green and Live Green

Using ThermalBuck™ to improve your window installation means you’ll use fewer natural resources to heat and cool your home year-round. Not only will that save you money, it’s better for the environment too.  

ThermalBuck™ reduces thermal bridging and prevents moisture from accumulating, which improves your indoor air quality – and that benefits your family’s health.