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. Yet 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 direct structural attachment of the window. Simple to install and easier to flash than a wood buck, it saves both time and money.

ThermalBuck™ is a true continuous insulation solution for the building envelope.

News & Events

ThermalBuck™ to Present at 2017 PCBC High Performance Home Theater May 26, 2017

  The largest homebuilding trade show on the West coast, the PCBC, will be held June 28th-29th in San Diego, California. Originally known as the “Pacific Coast Builder’s Conference“, this event has grown since 1959 to attract over 10,000 attendees from all over the world.     High Performance Home Theater One of the… Read more

Professional Builder Names ThermalBuck™ “Best of 2017 PCBC: Parade of Products” May 10, 2017

ThermalBuck™ is proud to announce our selection as one of the “Best of PCBC: 2017 Parade of Products” by Professional Builder Magazine. Each year, exhibitors for the PCBC are invited to submit new products to a distinguished panel of judges for consideration as one of the 15 winners of the Parade of Products.  Awards… Read more

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™   


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)

The use of a ROESE is recommended by the FMA/AAMA/WDMA 500-16 “Standard Practice for the Installation of Mounting Flange Windows into Walls Utilizing Foam Plastic Insulating Sheathing (FPIS) with a Separate Water-Resistive Barrier (WRB).” Purchase a complete pdf download at either of the links available through AAMA & WDMA

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.