The glass block window panel sits on the block or concrete wall and is held in place with mortar and caulk. When it comes to basement windows, there’s nothing more practical than glass block windows.

Question: I am remodeling my house and I plan to use decorative glass block windows on the exterior and interior as accents. Are they energy-efficient and are there low-cost do-it-yourself kits?

Dear Jim: I am concerned about the security and efficiency of some of my old single-pane first-floor windows. I think glass block windows would be more secure. Are they efficient, and can I install ...