Install section end blocks in your garage door to keep insulation materials in place and securing hinges to door ends. Through the use of weather stripping and glued joints, you will make a bond through the exterior and interior metal sheets, creating a weather proof steel. However, since most modern garage doors use steel sheets and steel end caps, a process called thermal bridging can take place, allowing for the easy transfer of heat into or out of the garage door. By using wooden end blocks instead, you will create a thermal break, insuring that heat doesn’t seep in during the Summer, or creep out during the Winter.