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.ThermalBuck handles loads of 70 lbs. per linear inch, and has a compressive strength of 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 in the building envelope. Both the waterproof coating and Dow-Corning 758 or DAP Dynaflex 800 sealant help 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.
Improving the energy-efficiency of new and existing construction has long been a focus of building science. When it comes to insulation, exterior rigid foam is the choice of many builders, because it stops the thermal bridge through the studs. As effective as rigid foam is as a continuous insulation solution,… Read more
When we say ThermalBuck is incredibly strong, we mean it. With a compressive strength of 52 psi, we know it can withstand hurricane force winds with minimal permanent compression. Just for fun, we were curious how it would stand up to John’s new Ram Truck. At over 5,500 lbs… Read more