The high performance window mounting system for continuous insulation.
ThermalBuck™ solves the challenge of installing nail flange windows & doors with exterior insulation by extending the mounting point to create a flush plane for cladding. It also insulates the rough opening, limiting thermal bridging around windows & doors.
Coated with a waterproof resin and secured to the rough opening with an air & water barrier sealant* and nails, it’s simple to install and easier to flash than a wood buck. Dimensionally stable and strong, it will not warp, rot, or shrink, and helps to support the weight of the window. ThermalBuck™ outperforms a traditional wood buck, and protects the integrity of your window & door installation.
*We recommend ThermalBuck™ installation with tested & approved sealants. See our FAQ page under “Sealants” for more information.
7th generation Missouri homebuilder Rusty MacLachlan, J.R. MacLachlan Custom Homes & Remodeling
If a window isn’t installed properly, it won’t matter how energy efficient it is.
Traditionally, a wood buck is built to extend the mounting point of the window to create a flush plane. But wood can rot, warp, and shrink over time. Wood is a poor insulator, allowing thermal bridging around each window and door. Not only does it reduce the energy efficiency of the building, it causes condensation to form, and potential damage from moisture—which can lead to expensive repairs.
“Once you see it, you really understand the problem this solves for builders like me.”
– Matt Risinger, Builder, Building Science Expert, Risinger & Co., Austin, TX
The ThermalTight™ System
The ThermalTight™ System makes it easier to build better, with a wall system that solves the challenge of building airtight, watertight, continuously insulated to limit thermal bridging, and designed to stay dry, all while ensuring a simple, labor-saving installation process.
Backed by a 15 year warranty, the components include ThermalTight™, ThermalBuck™, and BRINC Fluid FS, a dual-purpose flashing and sealant.
Learn more about the ThermalTight™ System components here.
