Why Choose ThermalBuck™ ROESE?

 How to Prepare the Rough Opening

ThermalBuck™ is L-shaped, and the 1/2″ tongue goes inside your rough opening. It helps distribute the load this way. Here’s an example of your measurements for a 35.5″ x 59.5″ window:

You’ll need to add BOTH the Rough Opening recommendations from the window manufacturer, and another 1/2″ on all four sides to accommodate the thickness of ThermalBuck™.  

Window manufacturer recommendations will vary – consult the appropriate installation manual.