Q: Can the cavity of a masonry wall be closed at openings without creating a thermal bridge? Is this best accomplished with wood blocking?

A window or door can be installed in a masonry wall in several ways without creating a thermal bridge at the lintel. Split steel angle lintels can be used with or without wood spacers. A combination of steel angle and reinforced masonry lintels also can be used. All three of these designs function well as a masonry wall lintel without creating a thermal bridge.Three ways to build a lintel in a masonry wall without creating a thermal bridge.