Dear Jim: My house needs more efficient windows. I live alone, so I am considering some glass block windows for security. Are they very efficient, and how can I have some summertime ventilation wit… ...

Plastic block windows are also available. Most are made from acrylic plastic, which is fairly impact-resistant. These windows are often installed as completed window panels to fit the wall opening.

Q: We like the look of glass block, even though it seems to be limited to rowhouse basement windows around here. From what we’ve seen in the shelter magazines, it seems to be very versa… ...